IWS FAST
®
built in
0 -10 -20
Fire protection
excellent Acoustics
integrated Structural engineering
optimal Thermal performance
Technical Guide - Engineered Floors
Contents
CONTENTS SYSTEM OVERVIEW Floor system Why IWS-Joist? Acoustic properties Floor assembly fire resistance
03 04 06 09
DESIGNERS SECTION Joist properties Multiple member connections Hole details & service penetrations Airtightness
10 12 14 16
BUILDERS SECTION Ground floor construction Masonry construction Timber frame construction Specialist details Joist bracing Safe loading of materials
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IWS FAST
®
built in
17 18 20 24 26 27
The IWS Logo and FAST are registered trademarks of IWS Ltd
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INTERMEDIATE FLOOR SYSTEM The IWS team have developed the most straightforward, fully compliant floor system on the market today. The IWS range comprises of: Grade
Widths (mm)
IWS-1
38 or 45
IWS-4
38 or 45
IWS-5
45
Standard Depths (mm)
Length
220, 235, 240, 241 245 or 253
Up to 12m
Other sizes available on request
• • • • • •
Does not require ancillary products such as backer, filler, squash blocks, or ply gusset plates Service voids can be pre-machined in the product to allow the quick and trouble free installation of cables, pipes, SVP’s and HVAC systems Mid-span blocking/strutting can be omitted Reduces the range and number of connectors Faster build times Brings major productivity gains to its partners’ manufacturing operations: • • • • • •
Easy to nail Minimum waste All components identified Minimum number of connectors Castellations ensure positive and quick location No mid-span blocking
The IWS-Joist is a unique variant of the original “Engineered Wood Product,” solid timber. It possesses very reliable strength and stiffness characteristics and is the only engineered joist on the market today pre-treated to provide robust fire protection and prevent against insect attack, wood decay and water ingress. This allows it to retain its strength and straightness characteristics both during and after the build process. The IWS-Intermediate Floor delivers superior acoustic performance, complying with Scottish, English and Welsh sound regulations on minimum specification floors without requiring insulation, sub-decks or additional layers of plasterboard. The system is much more than the product itself. We have listened to the concerns of the building industry and have tried to improve our construction details to assist in the delivery of higher quality floor performance in this ever more demanding environment. “Delivering practical and innovative building solutions”
IWS-Joists meet the relevant technical requirements of:
Certificate Number EWP-022 Certificate Number EWP-023
IWS FAST
®
built in
All rights reserved by IWS on products and services contained within the Technical Guide. Patent applications have been filed for all unique IWS details, these are noted within the Technical Guide.
Intermediate Floor
Why IWS-Joist?
WHY IWS-JOIST? PATENT PENDING
Cassette Alignment and Lifting Holes • •
Cassette lifting holes Allows adjoining cassettes to be seamlessly aligned
PATENT P
Treatment Process
Finger Jointing
HVAC Se
Exclusive treatment process provides unrivalled performance against moisture uptake and providing robust fire protection.
Allows joists to be supplied in lengths up to 12m.
Factory m anywhere
Treatment also provides resistance against insect attack and wood decay.
A simple to use, fully accredited flooring system that delivers real benefits: • Unique top hung detail with reinforcing plate providing accredited performance • Market leading acoustics – up to 4 dB better than current requirements • Ancillary products such as ply gusset plates, backer, filler and squash blocks not required • Mid-span blocking/strutting can be omitted • Reduces the range and number of connectors • Effective, short (during construction) and long-term fire protection
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PENDING
PATENT PENDING
ervice Void
Additional Machining
Soil Vent Pipe Hole
machined service void can be positioned e along joist length and at multiple locations
Holes and notching can be pre-machined to reduce work on-site and guarantee performance
Unique SVP detail factory machined at 120mm diameter available with no reduction in joist performance
Engineered Wood Products Certificate Number EWP-023***
Engineered Wood Products Certificate Number EWP-023***
Engineered Wood Products Certificate Number EWP-022
*EWP-010 – strength grade values for IWS grade material and low moisture content timbers ** EWP018 – compliance with EN 385 standards for finger joint strength ***EWP 23 – certificate on strength grade for design in accordance with EN 1995-1-1 (Eurocode 5)
Why IWS-Joist?
Acoustics
ACOUSTIC PROPERTIES Intermediate Floors Minimum airborne sound insulation levels. • Scotland Section 5.2 • England & Wales Approved Document E
= =
43 RW 40 RW
RW = Characterises airborne sound insulation in the laboratory, results are shown as dB (decibels).
44dB
22mm EGGER Protect Chipboard
No insulation No resilient bars 45x220mm IWS-Joist at 600c/c
15mm plasterboard
IWS can achieve sound reduction of 43dB with 220mm IWS-Joists with 12.5mm ceiling at 600mm joist centres*
*Other floor compositions available please contact IWS Technical Department on 01592 630774.
SRL Technical Report reference number C/21005/R01 - 8 December 2009
Benefits of EGGER/IWS-Intermediate Floor •
Meets challenging Scottish acoustic performance targets (minimum 43 dB Rw) with minimum specification:
No insulation
Typical saving - £4m2 materials PLUS £4m2 installation costs = £8m2
No resilient bars
Typical saving - £4m2 materials PLUS £4m2 installation costs = £8m2
Shallow floors
Overall depth 257mm
Cost savings in both materials and installation IWS-FR+ Joists are pre-treated, at no extra cost, to provide excellent fire mitigation properties (fully compliant with WPA Benchmark FR Build quality scheme) Only engineered joist on the market today pre-treated to significantly reduce water ingress. This allows it to retain its strength and straightness characteristics EGGER Protect to be nailed and glued (D4 adhesive) as per EGGER’s installation details.
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Section 5: Noise – The Building (Scotland) Regulations The airborne acoustic performance target for intermediate floors within dwellings, introduced in Oct 2010, as detailed in section 5.2.1 of the Technical Handbook for Domestic Buildings is minimum target 43 dB Rw. Practical guidance on meeting this new acoustic target is provided in Example Constructions and Generic Internal Constructions, Section 4.c, published May 2012 by the Buildings Standards Division. All the generic details include insulation as part of the specification with some including resilient bar systems in addition.
Floor Option
Decking
Ceiling
Insulation
Resilient Bars
Solid Joists 200mm 600c/c
15kg/m2
1 layer 10kg/m2
100mm
13mm depth
I-Joists 240mm 600c/c
15kg/m2
1 layer 10kg/m2
100mm
13mm depth
IWS-Joist 220mm 600c/c
EGGER Protect 22mm
1 layer 15mm
No insulation required
No resilient bar required
15
227
44dB
Joist Depth/ Ctrs
IWS/EGGER can achieve sound reduction of 44dB with 220mm IWS-Joists, 22mm EGGER Protect with 15mm ceiling at 600mm joist centres* *Other floor compositions available please contact IWS Engineering Department on 0117 945 3260. SRL Technical Report (UKAS no. 0444) reference number C/21005/R01 - 8 December 2009
Acoustics
Acoustics
ACOUSTIC PROPERTIES Separating Floors Compulsory post completion testing required for new build and conversions: Minimum Airborne Sound Insulation (DnT,w)
Maximum Impact Sound Transmission (nTw)
Target Criteria (Scotland)
56
56
Target Criteria (England & Wales)
45
62
IWS-FAST Timber Floor (for masonry)
60
51
IWS-FAST® Timber Floor IWS have developed the 1st practical timber engineered separating floor for masonry construction, the FAST® Timber Floor. The combination of a practical separating floor with masonry flank and separating walls can bring many further benefits.
Benefits include: 1. Robust masonry walls providing excellent structural and thermal performance, together with the speed, economy and efficiency of the FAST® Timber Floor 2. The FAST® Timber Floor is particularly suited to quick build masonry systems such as H+H’s Rå Build system, utilising Thin Layer masonry as a practical alternative to framed build systems 3. The use of a timber separating floor could significantly reduce costs in foundation due to reduced loading, when compared to alternative separating floor materials 4. The addition of Knauf insulation to the inner leaf of blockwork will reduce the need for other insulation materials 5. Icopal’s Monarfloor Wall Cap isolates the masonry wall from the separating floor joists, reducing the acoustic flanking sound transmission within the structure 6. The acoustic floor is mechanically fixed, thus reducing the issues of building directly off it For further information download a copy of IWS-FAST® Timber Floor guide.
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IWS-SF 1 (RD E-FT-2)* For timber frame for st ted Robu in p h ce Ac with wit e ails T-2 s u et -F D E 1 credit
Floating Floor
Structural Floor Ceiling
Floating Floor Treatment: Chipboard = 18mm t&g flooring board Plank = min 13.5kg/m2 gypsum Battens = FFT-1 (min. 70mm cavity) Insulation = 60mm mineral wool Structural Floor: Sub-deck = 15mm (min) wood based board Joists = IWS-Joists 245mm @ 600cc Insulation = 100mm mineral wool Ceiling: Resilient bars = 16mm Ceiling boards = 2 x15mm gypsum based board
Please refer to the Robust Details Handbook for full specifications. * All IWS-Separating Floors available as standard fixed or top hung details (for further information on top hung refer to page 22).
FLOOR ASSEMBLY FIRE RESISTANCE
Duration of Fire Resistance
30 minutes
60 minutes
Decking
22mm t&g flooring grade chipboard
15mm OSB decking (All board joints are to be supported if square edged boards are used)
Floating Floor
N/A
Floating floor system (not part of the fire resistance solution)
Joist
min. 38x220mm
min. 38x220mm
Ceiling
12.5mm plasterboard with either 1mm cover plaster skim and all joints plaster filled OR taped and filled joints
2 layers of plasterboard make up 30mm minimum depth with staggered joints
Resilient bar
N/A
Resilient bar suitable for fire rating
Insulation
N/A
100mm rockwool mineral wool (23kg/m3)
Typical IWS Intermediate Floor
Typical Separating Floor
22mm t&g chipboard
Floating floor system 15mm OSB decking 38 x 220mm IWS-Joist
38 x 220mm IWS-Joist
15mm plasterboard
30 Mins
60 Mins
100mm rockwool mineral wool (optional) Resilient bar 2 layers of plasterboard make up 30mm minimum
Notes 1. Fire resistance is based on Table 6.1 of TRADA timber frame construction 5th edition and BS 5268 part 4.2 2. Glass wool quilt (10kg/m3) between joists will increase fire resistance and acoustic performance beyond the minimum regulation requirements 3. Plasterboard manufacturer’s installation guidelines are to be followed including fixings and noggings 4. Guidance only, each project to be assessed on its own assembly mix
Fire Properties
Joist Properties
ALLOWABLE CLEAR SPANS FOR SINGLE SPAN JOISTS (m) Joist Spacing
400mm
Deflection Criteria
IWS-1
IWS-4
IWS-5
600mm
8mm
10mm
12mm
8mm
10mm
38x220
3.582
3.795
3.921
3.222
3.402
12mm 3.402
45x220
3.743
3.965
4.156
3.368
3.569
3.610
38x245
3.884
4.115
4.314
3.494
3.703
3.794
45x245
4.058
4.300
4.507
3.652
3.870
4.026
38x220
3.890
4.121
4.320
3.502
3.711
3.804
45x220
4.064
4.305
4.512
3.659
3.877
4.035
38x245
4.219
4.469
4.684
3.797
4.024
4.219
45x245
4.407
4.668
4.892
3.968
4.204
4.407
45x220
4.156
4.402
4.613
3.743
3.965
4.156
45x245
4.507
4.774
5.003
4.058
4.300
4.507
NOTES: 1. Clear spans calculated using the principles of EN 1995-1-1 with serviceability limited to the deflection values given 2. Clear spans IWS-4 & 5 approved by TRADA Technology 3. An allowance for non loadbearing partitions of 0.8 kN/m run is included as a udl 4. Lateral restraint to top of joist provided by suitable decking. 18mm chipboard up to 400mm centres and 22mm chipboard up to 600mm centres 5. No mid span blocking is required
CHARACTERISTIC VALUES - BS EN 1995 - 1-1 Grade
IWS-1
IWS-4
IWS-5
Joist Depth mm
Joist Width mm
Moment capacity kN/m
Flexural rigidity EI Nmm2 x 109
Shear rigidity GA Nx106
Shear capacity kN
Self weight of joist kg/m
220
38
4.90
269.75
4.18
17.83
220
45
5.81
319.44
4.95
21.12
245
38
6.08
372.56
4.66
245
45
7.20
441.18
220
38
7.36
220
45
245
Bearing End reaction 45mm bearing kN
Int reaction 89mm bearing kN
3.10
6.27
12.46
3.60
7.43
14.75
19.86
3.40
6.27
12.46
5.51
23.52
4.10
7.43
14.75
370.91
5.75
22.29
3.51
7.13
14.16
8.71
439.23
6.81
26.40
4.16
8.44
16.76
38
9.12
512.26
6.40
24.83
3.91
7.13
14.16
245
45
10.80
606.63
7.58
29.40
4.63
8.44
16.76
220
45
10.89
479.16
7.43
26.40
4.50
9.11
18.10
245
45
13.51
661.78
8.27
29.40
5.00
9.11
18.10
NOTES: 1. Values have been adjusted for Service Class 1 2. kmod, yM, kcnt and ksys modification factors are to be applied in order to derive the design values for use when designing in accordance with EC5 3. kcr is to be found in NA to BS EN 1995-1-1:2004+A1:2008 (UK National Annex to EC5) 4. For bearing kc90 to be applied
SAFE WORKING DESIGN VALUES - BS 5268-2 Grade
IWS-1
IWS-4
IWS-5
Bearing
Joist Depth mm
Joist Width mm
Moment capacity kN/m
Flexural rigidity EI Nmm2 x 109
Shear ri1gidity GA Nx106
Shear capacity kN
Self weight of joist kg/m
220
38
1.95
313.58
4.86
4.29
3.10
4.33
9.56
220
45
2.31
371.35
5.75
5.08
3.60
5.12
11.32
245
38
2.39
433.10
5.41
4.78
3.40
4.33
9.56
245
45
2.84
512.88
6.41
5.66
4.10
5.12
11.32
220
38
2.76
387.76
6.01
4.60
3.51
4.70
10.39
220
45
3.26
459.20
7.12
5.45
4.16
5.57
12.31
245
38
3.38
535.55
6.69
5.12
3.91
4.70
10.39
245
45
4.00
634.20
7.92
6.06
4.63
5.57
12.31
220
45
4.79
519.09
8.04
9.44
4.55
6.24
13.78
245
45
5.87
716.92
8.96
10.51
5.07
6.24
13.78
NOTES: 1. Values have been adjusted for Service Class 1 and long-term load duration 2. System factor K8 =1.1 included 3. Joists’ safe working values when used as floor joists only
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End reaction 45 bearing kN
Int reaction 89mm bearing kN
11
FLOOR PERFORMANCE
01592 630774
Floor performance is a subjective issue and can be influenced by many factors. It is extremely difficult to predict how a floor may feel. The perception of the end user can vary depending on the individual. Minimum standards are covered by design codes or NHBC requirements but may not give the expected performance. The most important factor influencing floor performance is stiffness, improving this decreases deflection, bounce and vibration. Below are 4 suggestions that may help improve the performance of your floor. Bonding the decking to the joists with appropriate adhesives Thicker decking and/or reducing centres of joists Deeper and/or wider joists Continuous/multiple span joists
= = = =
Improved composite action of joist and deck Improved load sharing Improved joist stiffness Reduced deflection, improved stiffness
At IWS we can design your floors to individuals needs/expectations.
RIMBOARD VERTICAL SAFE WORKING LOADS - BS 5268 - 2 Max Vertical Load (kN/m)
Width (mm)
Depth (mm)
Ply
IWS-1
IWS-4
IWS-5
38
220
1
35.05
39.85
43.00
45
220
1
41.50
47.20
50.95
38
245
1
35.05
39.85
43.00
45
245
1
41.50
47.20
50.95
Notes 1. Values have been adjusted for Service Class 2 2. Rimboard is a fully supported compression member with medium term uniformly distributed load (UDL) on top 3. The safe working loads have been derived from ultimate limits state values which are available on request 4. Buckling check has been excluded from calculation. Rimboard must be restrained
Stiffness properties (in kN/mm2)
Strength properties (in N/mm2)
CHARACTERISTIC MATERIAL VALUES - BS - EN 1995 - 1-1 Bending
IWS-1
IWS-4
IWS-5
fm,k
16.0
24.0
30.0
Tension Parallel
ft,0,k
10.0
14.0
18.0
Tension perpendicular
ft,90,k
0.40
0.40
0.40
Compression parallel
fc,0,k
17.0
21.0
23.0
Compression perpendicular
fc,90,k
2.2
2.50
2.70
Shear
fv,k
3.2
4.0
4.0
Mean modulus of elasticity parallel
E0,mean
8.0
11.0
12.0
5% modulus of elasticity parallel
E0,05
5.4
7.4
8.0
Mean modulus of elasticity perpendicular
E90,mean
0.27
0.37
0.40
Mean shear modulus
Gmean
0.50
0.69
0.75
Density (kg/m )
g,k
310
350
380
Mean density (kg/m3)
rmean
370
420
460
3
Notes 1. IWS joists are manufactured with tolerances to BS EN 336, Tolerance class T2, widths to +/- 1.0mm and depths are +/- 1.5mm, length- 0/+10mm all at 14% moisture content
Joist Properties
Side Loaded
SIDE LOADED (2 OR 3 PLY) BEAMS
Capacity tables for multiple member connections are derived by calculating the shear capacity of the fixings at the interfaces and then by multiplying these by 2 (2 ply members) or 3/2 (3 ply members) to obtain the maximum side load capacity on the assumption that the side load is applied on one side at a time and that plies are designed to carry equal loads. Design of the IWSJoist members to ensure that they can carry the loads is not covered by the tables.
Nails Unfactored Loads Applied To Side of Beam kN/m 2ply 38mm (Detail 1) Pattern
Joist Type A
B
2ply 45mm (Detail 2) Pattern C
A
B
3ply 38mm (Detail 3) Pattern C
A
B
3ply 45mm (Detail 4) Pattern C
A
B
C
IWS-1
4.25
6.40
8.55
4.35
6.50
8.70
3.19
4.80
6.41
3.26
4.88
6.53
IWS-4
4.95
7.40
9.90
5.00
7.55
10.05
3.70
5.55
7.40
3.75
5.65
7.55
5.30
7.95
10.65
3.95
5.95
7.95
IWS-5
3.1 x 75mm nails
-
3.1 x 90mm nails
3.1 x 75mm nails
3.1 x 90mm nails
Notes 1. Unfactored loads calculated from EN 1995-1 for domestic floor load conditions 2. All nails to be a smooth shank gun nail 3. Not applicable to ledger designs - consult with IWS Engineering Department for fixing of ledgers 4. The beam is assumed to be restrained by the floor decking secured to the composite beam
Detail
1
2 ply 38mm
Pattern
2
3
4
2 ply 45mm
3ply 38mm
3 ply 45mm
B
A
50
50
50
50 50
150
150
150
50 150
150
150
50
200
200
200
C
50
50
Bolts
Unfactored Loads Applied To Side of Beam kN/m Joist Type
2ply 38mm (Detail 5) Pattern D
2ply 45mm (Detail 6) Pattern
E
D
3ply 38mm (Detail 7) Pattern
E
D
3ply 45mm (Detail 8) Pattern
E
D
E
IWS-1
9.65
4.80
11.40
5.70
6.95
3.45
8.25
4.10
IWS-4
10.9
5.45
12.9
6.45
7.85
3.90
9.35
4.65
14.00
7.00
10.15
5.05
IWS-5
-
M12 bolts
Notes 1. Unfactored loads calculated from EN 1995-1 for domestic floor load conditions 2. Washers to be round or square edge 36mm side/diameter and 3.6mm thick 3. Bolts must not be countersunk 4. Bolt holes to be pre-drilled 5. Not applicable to ledger designs - consult with IWS Engineering Department for fixing of ledgers 6. The beam is assumed to be restrained by the floor decking secured to the composite beam
Detail
5
6
2 ply 38m
2 ply 45mm
Pattern
7
3ply 38mm
8
3 ply 45mm
D
50
E
50 50
50 50
300
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300
50
600
600
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Screws (LedgerLok) Unfactored Loads Applied To Side of Beam kN/m Plies
Thickness of headside member (mm)
Thickness of pointside member (mm)
Length of fastener (mm)
IWS-1
IWS-4
IWS-5
38 (Detail 1)
38
66
5.02
5.67
6.15
45 (Detail 2)
45
87
6.49
7.33
7.96
38 (Detail 3)
38
102
4.25
4.80
5.21
45 (Detail 4)
45
135
5.04
5.69
6.17
2
3
Notes 1. The values are for domestic floor loads and may be acting either parallel or perpendicular to the grain 2. Minimum edge and end distances of 45mm and 100mm respectively 3. Minimum spacing between fasteners perpendicular and parallel to the grain of 60mm and 100mm respectively 4. The unfactored loads in the above table are calculated using Annex G of BS 5268-2 based on the design input parameters given above and a minimum pointside penetration of 30mm 5. All screw information provided by Cullen Building Products
Detail
1
2
3
4
2 ply 38mm
2 ply 45mm
3 ply 38mm
3 ply 45mm
Minimum End, Edge Distances and Spacing
100
50
100
50
50
50 100
300
300
Tabulated capacities refer to screws @ 300mm centres as shown. Values may be increased pro-rata for reduced screw centres.
Load Capacity To Resist Point Loads From Incoming Joists On Multiple Members (Unfactored loads in kN) 2 & 3 ply (Detail 1)
Joist Type IWS-1
2 ply (Detail 4)
3 ply (Detail 4)
2 ply (Detail 5)
38
45
2 & 3 ply (Detail 2) 38
45
2 & 3 ply (Detail 3) 38
45
38
45
38
45
38
45
3 ply (Detail 5) 38
45
3.85
3.90
5.15
5.20
7.70
7.80
5.75
6.85
5.55
6.60
11.55
13.70
11.15
13.25
IWS-4
4.45
4.50
5.90
6.05
8.90
9.05
6.50
7.75
6.30
7.45
13.05
15.50
12.60
14.95
IWS-5
4.65
4.75
6.25
6.35
9.35
9.55
7.10
8.40
6.85
8.10
14.20
16.80
13.70
16.20
3.1 x 75mm nails
3.1 x 90mm nails
3.1 x 75mm nails
3.1 x 90mm nails
3.1 x 75mm nails
3.1 x 90mm nails
M12 bolts
Details with nail and bolt numbers to be used
60
1 60
60
50 =
50 =
= 50
= 50
6 nails
60
4 60
60
60 60
3
60 60
50 =
8 nails
60
5
= 50
12 nails
60
50
= =
2
50
2 bolts
4 bolts
Notes 1. Unfactored loads calculated for domestic floor load conditions using a factor on EN values 2. Loads can be applied from one side of 2-ply and either side of the 3-ply 3. Nails are smooth shank gun nails and bolts to have washers (round or square) 36mm side/diameter x 3.6mm thick 4. Bolts must not be countersunk 5. Bolt holes to be pre-drilled 6. For screw options refer to individual screw performance or contact IWS Engineering Department on 0117 9453260 7. Variations on arrangements consult with IWS Engineering Department 8. The design of the trimmer beam is to undertaken separately
Side Loaded
Holes & Services
HOLE DETAILS (Notch & drilling) End Load Bearing Support L = clear span 0.4L 0.25L 0.07L
0.125H
0.5H H
D 0.5H
D = 0.25H X = Minimum distance between notch and hole Y = Minimum distance between holes
100 + 0.5D X
3D Y
Internal Load Bearing Support L1 = clear span
L2 = clear span 0.5L1
0.5L2 0.35L1
0.35L2
0.5H D
H
0.5H D = 0.25H
Min 3D
Point Loads
0.5H H 0.5H
Min H + O.5D
Min H + 0.5D
Notes 1. L = Length of joist (load bearing support to load bearing support) 2. D = Diameter of hole 3. H = Height of joist 4. All holes to be on centreline of joist, holes and notches to be cut in shaded areas only 5. For additional notching and drilling requirements please contact IWS Engineering Department on 0117 9453260 6. Any holes/notches outwith guidelines to be confirmed with IWS Engineering Department
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Min 3D
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SERVICE PENETRATIONS HVAC/Service Hole (PATENT PENDING)
This innovative detail allows for the running of HVAC ducting and services, the “letterbox” hole can be positioned to suit service runs and has a maximum hole size of 65 x 300mm. The hole or multiple holes can be positioned anywhere along the length of the joist. It will be factory machined and plated so there is no need for any complex site cutting of joist. Engineered Wood Products Certificate Number EWP-023*
Plate dimensions 196 x 370mm
SVP/Service Hole (PATENT PENDING)
This unique detail allows for the running of SVP pipes and services without the need of costly trimmer and hanger details. The 120mm diameter hole can be positioned during the design process to suit SVP runs presented to IWS. The joist will be factory machined and hydraulically pressed so there is no need for any onsite alteration of the joist. Plate dimensions 196 x 300mm NB.No strength reduction using this system
Engineered Wood Products Certificate Number EWP-023*
*EWP 23 – certificate on strength grade for design in accordance with EN 1995-1-1 (Eurocode 5)
Notes 1. Both details allow for holes on centreline of joist 2. Holes can be positioned anywhere along length of joist 3. Holes cannot be altered on-site without prior consultation with IWS 4. When installing joists ensure all holes line through 5. For circular holes, minimum dimension to centreline of hole from end of joist = 210mm 6. For ‘letterbox’ holes, minimum dimension to centreline of hole from end of joist = 245mm
All SVP and HVAC service holes are unique IWS details and are pre-fabricated. These should not be copied on-site.
Holes & Services
Airtightness
AIRTIGHTNESS To ensure compliance with Approved Document L1A (2006) at junctions of masonry walls there are 3 options: 1. Use a proprietary end detail 2. Mastic around the joist (where I-Joist floor, fill voids of I-Joist with packers prior to mastic) 3. Support joists on hangers IWS-Joists Built In IWS-Joists are treated as standard, the exclusive treatment minimises water ingress and protects against insect attack and wood decay. This allows it to retain its strength and straightness characteristics both during and after the build process. The treatment is effective in ensuring stability of geometry and position in the blockwork where other timber based joist products, engineered or otherwise, built directly into a masonry wall will be susceptible to moisture absorption as a direct result of coming in contact with wet materials, namely the mortar used in the construction process or direct rainfall. However, IWS recommend that, when building in, builders should mastic around the joist. IWS-Joists Supported On Hangers Alternatively to build-in, joists can be supported on traditional or rapid build joist hangers.
IWS-Joist Built into Masonry
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IWS-Joist Supported By Rapid Build Hanger
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GROUND FLOOR CONSTRUCTION (Typical details) Joists Perpendicular
Sealant
Min 150mm to DPC
External ground level higher than internal to building designer’s specification
DPC
Air flow to building designer’s requirements Foundation
Min 150mm air cavity to bottom of joist
Min 75mm to DPC
Notes Insulation between joists and netting removed for clarity
Joists Parallel
Sealant
Air flow to building designer’s requirements Min 150mm air cavity to bottom of joist
Min 75mm to DPC
Min 150mm to DPC
Notes Insulation between joists and netting removed for clarity
IWS-Floors will provide a robust ground floor detail, incorporating water repellant and preservative treated beams and joists. Ground Floor Design 1. IWS-Joists in ground floor construction is acceptable to Class 2 preservative treatment. Joists should be designed for service class 2 conditions. For further guidance please contact IWS Engineering Department on 0117 9453260. 2. Thermal insulation is required in all ground floors, this should be specified in accordance with building designer’s details. 3. All ground floors should be constructed to resist the ingress of moisture. IWS-FR+ treated timber includes a water repellent and preservative treatment. 4. Ventilation should be in accordance with building designer’s specification. Where the construction of floors are in areas affected by radon gas then specialist advice should be sought. 5. Internal ground coverings to comply with building regulations. 6. Disabled access needs to be considered. 7. Insulation to ground floor is to be detailed by the building designer.
Ground Floor
Masonry
MASONRY CONSTRUCTION
M5 M3 & M4
M2
M6
M1
M1 Cavity Wall Joists Built-In
M2 Restraint Strap - Joists Parallel to Wall
Minimum 38x50mm nogging skew nailed to joist. Keep nogging minimum 15mm from wall. Noggings may also be required for ceiling support
Timber blocking between 1st joist and wall Proprietary PFS strap fixed as per manufacturer’s instructions, spaced to building designer’s specification
90mm min
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Minimum bearing of 90mm required to provide adequate restraint, joists must not extend into cavity
25mm min
Timber blocking equal to half depth of joist (minimum)
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M4 Restraint- Joist Perpendicular to Wall
M3 Masonry Hanger Important - A minimum of three block course (675mm) must be constructed above standard masonry hanger before floor is loaded. This is not required for rapid build masonry hanger.
Perimeter noggings omitted for clarity
Standard masonry hanger. See connector manufacturer’s installation details for more information
PS restraint strap
Masonry wall requires restraint Rapid build masonry hanger. See connector manufacturer’s installation details for more information
Straps to be fitted at convenient locations and spaced no greater than 2m apart. Fixed to joist using minimum 7no. 3.75x30mm square twist nails for further information consult connector manufacturer or building designer
Perimeter noggings omitted for clarity
M5 - Internal Load Bearing Wall
M6 - Typical Joist to Joist Connections
Continuous joist Splice joint
Light duty hanger
Lap joint (45mm minimum bearing)
Heavy duty hanger
Internal load bearing wall, minimum 89mm bearing
Full depth blocking required, alternatively masonry wall can be built up to provide support
Install using correct number and type of fasteners. Refer to approved manufacturer’s guidelines.
Noggings omitted for clarity
M7 Typical Joist to Steel Connections Face fix hanger fixed in accordance with manufacturer’s instructions Timber packer fixed to building designer’s specification
Dropped joist/top hung fixed in accordance with manufacturer’s instructions
Top fix hanger may be shot fired to steel in accordance with manufacturer’s instructions
Timber packer fixed to building designer’s specification
Underside of joist is typically set at 5mm below steel beam flange datum level to allow for self weight deflection of steel beam
M7 UNIQUE Joist to Steel Connections IWS Steel Connect: • Fast and simple to fit • No metalwork required • No bolts • No ancillary products
These details are representative of the type of detailing for IWS-Floor. The building designer is responsible for ensuring that they are appropriate for the end application. IWS can advise on suitability. See notes for temporary erection bracing and procedures. For any construction detail not covered in this guide contact the IWS Engineering Department on 0117 9453260. Thermal and fire requirements to building designer’s specification
Masonry
Timber Frame
TIMBER FRAME CONSTRUCTION (Structural generic details only, thermal, airtightness and acoustic by others) T12
T5 & T9
T3
T4
T10 T2
T1 T6 & T7 T8
T1A Joists Parallel to External Wall
T1B Joists Parallel to External Wall
Decking continuous to outside edge of frame and attached to rimboard
Fix rimboard to blocking using 3.1x90mm nails top and bottom Rimboard fixed to frame using 3.1 x 90mm nails at min 300mm centres
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Expansion gap to decking manufacturer’s specification Fix rimboard to blocking using 3.1x90mm nails top and bottom Rimboard fixed to frame using 3.1 x 90mm nails at min 300mm centres
Decking bearing to manufacturer’s specification. Use 38x50mm nogging
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T2A Joists Perpendicular to External Wall
Fix rimboard to joist using one 3.1 x 90mm nail top and bottom
Rimboard fixed to frame using 3.1 x 90mm nails at 300mm centres
Decking continuous to outside edge of frame and attached to rimboard
T2B Joists Perpendicular to External Wall
Fix rimboard to joist using one 3.1 x 90mm nail top and bottom
Rimboard fixed to frame using 3.1 x 90mm nails at 300mm centres
Minimum bearing to be 45mm
T3 Joists Parallel to Party Wall
38x50mm perimeter noggings skew nailed to joist
Minimum bearing to be 45mm
T4 Joists Perpendicular to Party Wall
Expansion gap to decking manufacturer’s specification
Option B
Option B
Option A
Expansion gap to decking manufacturer’s specification
Option A
Expansion gap to decking manufacturers’ specification
Decking, bearing to manufacturer’s specification. Use 38x50mm nogging if required
Minimum thickness of rimboard and blocking to be 76mm
Minimum thickness of rimboard and blocking to be 76mm
Timber Frame
Timber Frame
T6 Non-Load Bearing Partition Perpendicular To Joist
T5 Non-Load Bearing Partition Parallel Non-load bearing partition maximum self weight 0.8kN/m nailed to each nogging
Non-load bearing wall nailed to each joist maximum self weight 0.8kN/m
Decking Decking
38x75mm noggings at maximum 600mm centres fixed with 2no. 3.1 x 90mm nails skew nailed at each end. Alternatively use Z-Clips.
T7A Timber Load Bearing Wall Above Joists Perpendicular Full depth blocking centred on partition
Chipboard run under load bearing wall
T7B Timber Load Bearing Wall Above Joists Perpendicular Load bearing wall
Full depth blocking centred on partition
Expansion gap as per decking manufacturer’s specification
Additional 38x50mm nogging required to support decking
Minimum 89mm load bearing wall aligned under wall above
Minimum 89mm load bearing wall aligned under wall above NB. Double blocking may be required depending on vertical load from partition
T8 - Top Hung Details - PATENT PENDING IWS top-hung detail: • Makes it easier to locate joists onto support • With a rimbeam and top hung detail allows easier panel construction by omitting lintels in the panel • Without rimbeam, lintels required in the panel but provides a thermal bridge benefit • With a rimbeam and top hung detail there is no need to line up joists with timber studs • Reduces shrinkage • Is available in 45 or 75mm deep nibs • Provides stable support condition for on-site construction Directly onto timber frame
Onto internal rimbeam
NB. No cutting/drilling into the plate reinforcement NB2. Noggings - nails may be driven through plates without any performance reduction
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Engineered Wood Products Certificate Number EWP-022
Over external rimbeam
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T9A Timber Load Bearing Wall Above Joists Parallel
T9B Timber Load Bearing Wall Above Joists Parallel Load bearing wall
Load bearing wall
Expansion gap as per decking manufacturer’s specification
Additional 38x50mm batten required to support decking
Additional joist centred on line of load bearing wall
Minimum 89mm load bearing wall aligned under wall above
Minimum 89mm load bearing wall aligned under wall above
T10 Cantilever Joists Closure
T11 Typical Disproportionate Collapse Detail
Full-depth blocking Joist hanger
Load bearing wall
Ring beam Ca
nti
lev
er Ba
ck
sp
an
Backspan must be at least 3 times the cantilever length. Maximum cantilever 1200mm For cantilevers with any concentrated load applied to them seek advice from the IWS Engineering Department.
T12 (A&B) Typical Joist to Joist Connection
Corner bracket All disproportionate collapse details should be in accordance with building designer’s specification
T12 (C&D) Typical Joist to Steel Connection
Light duty hanger Timber plate fixed to building designer’s specification
Face fix hanger fixed in accordance with manufacturer’s instructions
Underside of joist is typically set at 5mm below steel beam flange datum level to allow for self weight deflection of steel beam Heavy duty hanger
Install using correct number and type of fasteners. Refer to approved manufacturer’s guidelines.
IWS Steel Connect: • Fast and simple to fit • No metalwork required • No bolts • No ancillary products
These details are representative of the type of detailing for IWS-Floor. The building designer is responsible for ensuring that they are appropriate for the end application. See notes for temporary erection bracing and procedures (pg34-35). For any construction detail not covered in this guide contact the IWS Engineering Department on 0117 9453260 Thermal and fire requirements to building designer’s specification.
Timber Frame
Specialist Details
SPECIALIST DETAILS S2
S1
S1 - Cassette Details - PATENT PENDING Connecting Cassettes
Typical Stairwell Trimming Detail
Option A - Oversail
PATENT PENDING
Option B - Flush
Option C - Infill (Sub-Floors only)
Option D - Flying Deck (Sub-Floors only)
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S1 - Cassette Alignment Holes - PATENT PENDING
Stage 1
Stage 2 Allows adjoining cassettes to be seamlessly aligned
These details are representative of the type of detailing for IWS-Floor. The building designer is responsible for ensuring that they are appropriate for the end application. See notes for temporary erection bracing and procedures (pg26-27). For any construction detail not covered in this guide contact the IWS Engineering Department on 0117 9453260. Thermal and fire requirements to building designer’s specification
Specialist Details
Bracing
STANDARD LOOSE JOIST BRACING For use where joists are constructed on site and not as pre-fabricated floor units. Temporary Erection Bracing System (in accordance with UKTFA Guidance). Details shown apply to both masonry and timber frame construction. Do not place any construction loads or allow workers to walk on unbraced floors.
.4m
.2
x Ma
x.
Ma
m
2.4
Diagonal bracing to cover minimum 3 joists
38x150mm temporary stability blocking over minimum 1.2m
NOTES 1. All joists are unstable until laterally braced. All instructions are offered as general guidance only, it is the responsibility of the builder to ensure the structure is erected in a safe and controlled manner. 2. All bracing to be 22x100mm and nailed into each joist using 2no. 3.1 x 90mm nails. 3. Diagonal bracing should run over at least 3 joists. 4. All longitudinal bracing must be attached to a sector of diagonally braced and blocked joists. Remove safety bracing progressively as decking proceeds.
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5. DO NOT WALK OR WORK ON UNBRACED JOISTS.
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SAFE LOADING OF MATERIALS
Do not load materials on this area
m
1.5
NOTES 1. Do not load materials within a trimmed stairwell or opening area. 2. Materials may be stored within 1.5m of a support provided the load is uniformly distributed between several joists and does not exceed 200kg per joist. 3. Construction materials can only be stored on fully braced floors. 4. Joists on masonry hangers may require propping. Please consult your hanger manufacturer for details.
!
5. DO NOT STORE BUILDING MATERIALS ON UNBRACED JOISTS.
General Guidelines For Using This Technical Guide IWS reserve the right to amend or update the technical information contained within this guide without giving prior notice. The information contained in this guide is correct at the time of publication, Nov 2012. For current product updates and technical data please refer to www.intelligentwoodsystems.com. Publications posted on the website will supersede all previous IWS guides and information sheets. The details contained in this guide are representative of the type of detailing for IWS-Floor. The building designer is responsible for ensuring that they are appropriate for the end application. See notes for temporary erection bracing and procedures. For any construction detail not covered in this guide contact the IWS Engineering Department on 0117 9453260.
Safe Loading
Published - 21/01/13
Production Office: IWS c/o Glenalmond Station Road Methven Perthshire PH1 3QF T: 01738 840258 Admin/Accounts Office: IWS c/o Glenalmond Shore Road Harbour Perth PH2 8BD T: 01738 587988 Engineering Office: Milner Associates 129 Cumberland Road Bristol BS1 6UY T: 0117 9453260 www.milnerassociates.co.uk
Reviewed and certified by:
Associates
Milner
Performance data generated from tests at UKAS accredited test facility BPAC:
BPAC
[email protected] www.intelligentwoodsystems.com
© Intelligent Wood Systems Ltd 2012
