IWI to suspended floor, parallel joists [Version ID #240]
Detail summary
IWI detail for a suspended floor, or an internal floor; accessible from below to be in-filled with insulation; where the existing joists run parallel to the external wall to be insulated.
VALUES:
Target Wall U-value: 0.3W/m2k \ Target Floor U-value: 0.2W/m2k
Technical description
Section detail. IWI at perimeter to insulated suspended timber floor in parallel joists.
Before installation: Remove all timber fixtures: Skirting, Picture Rails, Dado Rails etc. Remove curtain rails. Remove electrical socket/ telephone/cable socket outlets. Re-fix/renew all removed once insulation complete.
Before starting work undertake study of form and condition of existing walls and likely resistance to penetrating damp; log requirement of any repairs and/ or additional works to both internal and external condition necessary before installation of new system -e.g. re-pointing or repairs to external render. Internally: Before starting work carry out study of form and condition of the existing walls; draw up schedule of fixtures, finishes and fittings to be removed/relocated in order to install the internal wall insulation system. Attention to be paid to mechanical and electrical services (e.g. radiators, light switches). Refer to detail drawings for treatment of potential cold bridges (e.g. window reveals). All timbers: Before starting work carry out inspection of any structural timbers which enter the wall to be insulated (e.g. floor joists). Report any signs of damp or rot to contract administrator immediately. Record current condition of timbers and moisture content for future reference.
All Expanded polystyrene insulation (EPS): To BS EN 13163. All fixings manufactured in accordance with BS1210. Mineral wool (MW): To BS EN 13162; reaction to fire rating to: BS EN 13501-1 All vapour control layers/ air tightness layer to durability requirements of EN 13984.
Please refer to Approved documents: B (fire safety): B1 section 1 (material alterations)/ B2 section 3 (internal fire spread), and Appendix A (material properties). Doc L: Section 5 and 6 of L1B; including all relevant amendments. Ensure existing joists meet requirements in Approved document A (structural) before starting works.
Parts list
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Internal Wall Insulation System (95mm) [IW02]
Earthwool Eco batt insulation. Thickness 95mm\ Target u-value: 0.3W/m2k. Thermal conductivity: 0.033W/m2k/ 0.130W/mk. GWP<5. \ Fixing: In accordance with manufacturer's recommendations. Supports: EcoStuds - XPS and OSB uprights.
Knauf \ ThermoShell Internal Wall Insulation System
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Vapour Control Layer [IW02]
Intelligent breather membrane. \ Fixing: Laps And Edges: Sealed with vapour-tight adhesive tape. At junctions with party/patition walls, lap under insulated plasterboard. At floor and ceiling junctions ensure is appropriately sealed.
Pro-clima \ Intello membrane
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Junction sealing- Draughtex Neoprene Strips
All timber ground floors: draught-proof and seal all timber floors to ensure no air-leaks. Draughtex neoprene strips or timber fillet/ mastic seal between skirting and floor. \ Skirtings and Wall junctions: Seal all junctions and repair any cracks in plaster to ensure no air-leaks. Standard decorators caulk between skirting and wall.
Draughtex \ www.draughtex.co.uk \ Draughtex Neoprene Strips
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Double-sided air seal tape [DP09b]
Tape for junctions critical to air-tightness. 85mm (typical). \ Accesssories: ORCON F sealant and TESCON PRIMER RP (for use on rough/old surfaces to assist adhesion)
Contacts: Pro Clima \ http://www.greenbuildingstore.co.uk/page--pro-clima-airtightness-tapes-options.html \ Contega SL.
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Plasterboard and fixings [IW02]
Plasterboard components to be installed with IWI system. Knauf Moistureshield/ Wallboard/ Denseshield. Knauf Drywall screws.
To IWI manufacturers recommendation.
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EcoStud insulated supports IWI system [IW02]
Vertical supports for IWI batts. Thermally engineered composite of high performance extruded polystyrene bonded to Oriented Strand Board 3 (OSB 3)supports to IWI sheets. Expanded polystyrene insulation (EPS): To BS EN 13163.
Knauf Insulation. \ http://www.encon.co.uk/sites/default/files/products/downloads/datasheet-ecostud.pdf \ Reference: EcoStud for Solid walls. (Used in conjunction with Earthwool EcoBatt.)
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Woodfibre Insulation Between Floor Joists [FL01]
Woodfibre Insulation. \ Thickness 200mm. \ Friction fit between joists to ensure air-tightness- cut batts approx 20mm wider than opening between joists. Supported by Polyester webbing drawn underneath insulation at approx 600mm centres, fixed to joists.
Unger \ www.unger-diffutherm.de \ Reference: UdiFLEX
Revisions
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Admin - 2015-04-30 09:50:00
General re-formatting. DWG file updated.
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Admin - 2015-03-30 11:57:28
Preview image and detail pdf updated.
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Admin - 2015-03-30 11:57:10
http://rpb.hellings.webfactional.com/detail/44/
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Admin - 2015-03-26 17:20:57
General re-formatting. Introduction expanded, technical description expanded with approved document links. Parts list updated with suppliers links.
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Admin - 2015-03-16 15:53:30 [Displayed version]
Version 2- Introduction expanded. Technical description expanded and updated with BS and approved docs. Parts list updated with codes.
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Admin - 2015-03-03 16:44:55
First Version
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For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
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For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
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User name
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
- Ease of understanding detail: Easy
- Ease of sourcing materials: Easy
- Ease of sourcing skills: Easy
- Ease of implementation: Easy
- Overall cost: Low cost
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For those who have seen the Earth from space, and for the hundreds and perhaps thousands more who will, the experience most certainly changes your perspective. The things that we share in our world are far more valuable than those which divide us.
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