New window to EWI, reduced width due to corner (Plan) [Version ID #220]
Detail summary
Detail for new replacement window, where existing window fitted to an external corner requires a reduced width reveal box.
A variation on the "New window to EWI, retrofit installation" detail where the new window is mounted onto a timber box and installed into a finished EWI installation. This detail modifies the box design to allow for the corner detail shown.
Psi Values: Cill: 0.045 W/mK Lintel: 0.059 W/mK
Technical description
Plan detail. EWI to new replacement window, for retrofit of window after EWI installation, on reduced width box into former window location, in corner. New triple glazed window to replace existing.
SUGGESTED INSTALLATION SEQUENCE:
Windows and window boxes should be fitted prior to installation of external wall insulation wherever possible. Ideally installed from outside, with insulation fitted tight up to box and appropriate air-tightness work undertaken as shown on detail drawings. Where this is not possible, windows and boxes can be fitted from inside, with temporary boxing acting as place-holder within the insulation until installation can take place.
REFERENCE SPECIFICATION;
All new replacement timber windows to BS 644, operation and strength characteristics to BS 6375-2. All timber members in windows to BS EN 942. Glazing beads clear finish to Class J2.
Care should be taken during the installation to ensure the continuity of insulation and air-tightness at the junction between window, existing wall and external wall insulation.
All insulation to be continuous to avoid thermal bridging.
Preparation of external wall: Remove any existing loose material and prepare in accordance with manufacturer's requirements.
Any alterations to drainage and other fixtures, or work to prepare the substrate, to be agreed with contract administrator prior to work being undertaken. Prior to start on site inspect the form and condition of the structural substrate; institute repairs and/ or additional works necessary to make the substrate suitable to receive EWI system.
Parts list
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EWI (Woodfibre) System With Rendered Finish [EW01]
For use on solid and hard to treat cavity walls. Composite woodfibre board. UdiTherm SK back board, Diffutherm NF (T&G, renderable) top board. \ Fixed mechanically to substrate in accordance with manufacturers recommendations. \ Base Coat - levelling on substrate: 90% contact required around edge of boards between board and substrate to prevent thermal bypass. If substrate is very uneven, use base-coat material around edge of board to achieve contact. \ Thermal conductivity: 0.045W/m2K. GWP 0.
Unger \ www.unger-diffutherm.de \ Reference: UdiFRONT. \ Render: UDI Perl
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New Timber frame, triple-glazed windows [GD01]
Eco-Contract Ultra Outward Opening Casement Windows.\ Thermal Performance (overall u-value) : 0.79W/m2K.\ Air-tight. Size: As schematic.\ Opening Pattern/ Configuration : As existing (unless otherwise stated on schematic).\ Sash/Frame Material: FSC 100% Redwood.\ Drip Rail : Aluminium. \ Finish - Interior: Factory finished paint/varnish system.\ Finish - Exterior: Factory finished paint/varnish system. \ Glazing Unit : Triple, Argon Fill, 44mm. \ Glazing Type: as standard triple glazed unless stated: Light transmission : 72%. \ Solar factor (g): 52%. \ Handle Type: Manufacturer's standard, factory fitted. \ Security: Secured by Design.\ Accessories: Egress Hinges and Child Safety Restrictors. \ Guarantees: Manufacturer's standard.
Manufacturer: Green Building Store. \ www.greenbuildingstore.co.uk \ Tel: +44 (0)1484 461705. \ Reference: Eco-Contract Ultra Outward Opening Casement Windows
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Self-finished softwood box to mount window into EWI [EW04a]
To fit existing structural opening. Box to be constructed to same outside dimension as window opening. Window box. \ Depth as detail drawing. Inner edge of reveal to protrude 20mm inside the room, beyond the existing plaster face. \ Species : European Redwood. \ Section Sizes: As detail drawing. \ Adhesive to contractor’s specification. Mechanically pre-fixed and glued to window frame to existing masonry : Window reveals to be fixed back to outer leaf of masonry with frame fixings countersunk and plugged, at between 450mm - 600mm centres to suit window size. \ Certification : All timber to be FSC certified.
Contractor's choice
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Mastic air-tight adhesive/sealant [DP09c]
Air-tight adhesive/sealant. \ Location : as per drawing - critical junctions for air-tightness around windows.
Pro Clima \ http://www.greenbuildingstore.co.uk/page--pro-clima-airtightness-adhesives-options.html \ ORCON F \ Primer/ accessories: TESCON PRIMER RP.
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Timber appropriate to construct sub-frame
As per drawing or appropriate to existing condition.
Contractor's choice
Revisions
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Admin - 2015-04-29 16:10:13
DWG file uploaded. General re-formatting.
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Admin - 2015-03-30 12:22:54
Preview image and detail pdf updated.
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Admin - 2015-03-25 12:44:41
General formatting.Technical description updated with additional clauses and notes. Parts list updated with suppliers links.
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Admin - 2015-03-13 17:30:31 [Displayed version]
Introduction updated, Technical description revised. Parts list expanded with codes.
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Admin - 2015-03-10 11:20:04
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
- 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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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
Feedback summary
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Discussion
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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