Retained window to EWI, thin jamb (Plan) [Version ID #144]

Author details

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Detail summary

EWI detail to an existing window, to be retained, where existing window is hard up against the inside edge of existing window jamb. This detail proposes Aerogel insulation to be used in insulation systems where existing window jamb and head is too narrow for standard 40mm woodfibre reveal boards.

Technical description

Plan detail. EWI to existing retained window, perpendicular cill profile.

Where existing position of windows is to be retained when EWI is installed, window reveals must be insulated to prevent cold bridge. Phenolic foam to be used in foam based EWI systems or in woodfibre systems where existing window jamb and head is too narrow for standard 40mm woodfibre reveal boards.

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.

Parts list

  • Aerogel matting

    Aerogel thermal insulation. Thermal conductivity 0.013 W/mK.

    Thermablok \ http://www.thermablok.co.uk/

  • External Wall Insulation (Woodfibre) System With Rendered Finish

    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

Revisions

  1. Admin - 2015-04-29 16:31:11

    DWG file uploaded.

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  2. Admin - 2015-03-30 12:18:25

    Preview image and detail pdf updated.

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  3. Admin - 2015-03-30 12:18:05

    Preview image and detail pdf updated.

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  4. Admin - 2015-03-27 15:40:08

    EWI accessories and Air seal tape added.

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  5. Admin - 2015-03-25 13:21:06

    General re-formatting. Introduction revised. Technical description updated and additional notes added. Parts list updated with suppliers links,

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  6. Admin - 2015-03-10 11:58:57 [Displayed version]

    Version 2. - Intro/summary changed

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  7. Admin - 2015-03-10 11:57:57

    First version

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