IWI to retained window with secondary glazing [Version ID #232]
Detail summary
Detail for EWI to head & jamb of existing window (single glazed or other). For windows within IWI (retained and new) with minimal frame depth. Where windows sit within internal wall insulation, it is necessary to insulate the reveals to prevent a cold bridge.
where secondary double glazed window unit to be added to the inside face of the window for improved thermal performance.
VALUES:
Psi cill value: 0.03W/m2k. Psi lintel value: 0.03 W/m2k. Target wall value: 0.3W/m2k.
Technical description
Section Detail. IWI to secondary glazing, set within existing frame.
Psi cill value: 0.03W/m2k. Psi lintel valueL 0.03 W/m2k. Target wall value: 0.3W/m2k.
SUGGESTED INSTALLATION SEQUENCE:
Preparation: Cills and framing : Remove existing internal cills and any additional internal framing to window. cabble surface to perforate paint (create lost of small holes with appropriate tool) and remove all wall-paper etc. Re-fix/renew all removed once insulation complete. Plaster: Where existing plaster is gypsum-based, or where space is required, remove existing plaster finish.
1.) Clean existing window. 2.) Fix secondary glazing. 3.) Fix air-seal tape in place. 4.) Install internal wall insulation. 5.) Install insulation to reveal
REFERENCE SPECIFICATION:
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.
Rigid insulation: where used Phenolic foam (PF): To BS EN 13166.
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). Approved document F (ventilation). Document K, sections K4 and K5; and Doc L: Section 5 and 6 of L1B; including all relevant amendments.
Parts list
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Insulated Dry-Lining Board- Jamb & head [IW05b]
Phenolic Foam Thermal Plasterboard with integral vapour control layer (plasterboard thickness: 12mm, insulation: 17mm thickness). Tapered edge. \ U-value: 0.21W/m2k. GWP<5. \ Adhesive scored bonding coat to ensure no air-gap to rear of board. Taped and filled joints. Prepared for plaster skim coat finish.
Kingspan Insulation Ltd \ Kooltherm® K17 Insulated Plasterboard
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Rigid insulation below cill [IW05b]
Rigid insulation board. Thickness: 15-24mm (to suit window frame/ opening). \ U-value: 0.023W/m2k
Kingspan Insulation Ltd \ Kooltherm® K3 Floorboard
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Softwood Window Board to Sill [IW05b]
Subject to contractor. Half-round edge. European redwood. Class 2 to BS 1186-3. Natural finish. No preservative treatment. FSC certified. Fixed with lost nail heads at 30mm centres
Contractor choice.
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Internal Wall Insulation System (95mm) [IW02]
Earthwool Eco batt insulation. Water repellent glass mineral wool slab to BS EN 13162. 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. Requires: EcoStud for solid wall uprights. Wall plugs fixings, Vapour control layer, plasterboard and fixings.
Knauf \ http://www.knaufinsulation.co.uk/media/915296/kine1089gid_-_iwi_design_guide.pdf \ ThermoShell Internal Wall Insulation System
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Single-sided air seal tape [DP09a]
Tape for junctions critical to air-tightness. 60mm (typical). \ Accesssories: ORCON F sealant and TESCON PRIMER RP (for use on rough/old surfaces to assist adhesion)
Pro Clima \ http://www.greenbuildingstore.co.uk/page--pro-clima-airtightness-tapes-options.html \ TESCON VANA/ TESCON PROFIL (2 release tapes)
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Vapour Control Layer [IW02]
Intelligent breather membrane to durability requirements of EN 13984 \ 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 \ Reference: Intello membrane \ ALTERNATIVE SUPPLY: Knauf \ http://www.knaufinsulation.co.uk/media/1080123/kine1491dat-thermoshell-vapour-control-layer-datasheet.pdf \ Thermoshell Vapour Control layer- vapour resistance: 260MN.s/g.
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Secondary Glazing System [GD06]
Secondary glazing. \ Horizontal slider, heavy duty frame. \ Glazing : 20 mm low-e coated argon filled double glazing unit with warn edge spacers – toughened inner pane. \ White semi-gloss polyester powder coated.
Duration Group \ www.duration.co.uk \
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M20A Single layer plasterboard backings [IW02]
Wallboard, 15mm thickness. Nail fixed as IWI system manufacturers recommendations. Knauf multi purpose sealant/ taped joints. Beads and stops for plaster in Stainless steel on all external angles and stop ends.
Contractors choice OR Knauf Moistureshield/ Wallboard/ Denseshield.
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M20A two coat board finish plaster [IW02]
Applied to whole system including insulated reveal boards. \ Two coat (undercoat plus finish) plaster system. \ Gypsum bonding plaster undercoat to manufacturers recommendations. Final coat: finish plaster, 2-3mm applied one-coat, smooth.
Contractors choice
Revisions
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Admin - 2015-04-30 10:17:14
DWg file uploaded. General formatting changes.
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Admin - 2015-03-30 12:03:25
Preview image and detail pdf updated.
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Admin - 2015-03-29 11:13:53
IWI supports added to parts list
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Admin - 2015-03-29 11:06:13
IW05b "insulated dry-lining board" replaced with "laminate plasterboard
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Admin - 2015-03-26 23:02:29
General re-formatting. Introduction adjusted. Technical description updated and expanded with additional BS codes and approved docs. Parts list updated with suppliers links.
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Admin - 2015-03-16 13:54:25 [Displayed version]
Introduction, and technical description updated with BS and approved docs. Parts list expanded and codes added.
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Admin - 2015-03-03 17:28:59
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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