EWI insulation with new window.

This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading the structural load of new window on EWI, and maximising glazed area.

The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required). This detail is designed with the intention that the window and box be installed prior to the external wall insulation system.

Target values: Thermal Performance (overall u-value) : 0.79W/m2K. Cill Psi value: 0.066 W/mK Lintel Psi Value: 0.00023W/mK

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EWI insulation with new window (Plan)

Detail for a new window with a timber frame, to be mounted into external wall insulation, in place of an existing window. This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading structural load of new window and maximising glazed area.

The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required). This detail is designed with the intention that the window and box be installed prior to the external wall insulation system.

Target values: Thermal Performance (overall u-value) : 0.79W/m2K. Cill Psi value: 0.066 W/mK Lintel Psi Value: 0.00023W/mK

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New window to EWI, retrofit installation

Detail for a new window with a timber frame, to be mounted into external wall insulation, in place of an existing window. This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading the structural load of new window on the EWI, and maximising glazed area.

The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required). This detail is designed so that the window and box can be installed after the external wall insulation system is in place.

Target values: Cill Psi value: 0.045 W/mK. Lintel Psi value: 0.059 W/mK.

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New window to EWI, for single brick reveal (section)

Detail for a new window with a timber frame, to be mounted into external wall insulation, in place of an existing window. Used where a single brick reveal means the original window was originally sat behind, and larger than, a structural opening in the outer face of an existing masonry wall.

This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading structural load of new window and maximising glazed area. The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required).

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New window to EWI, for single brick reveal. (plan)

Detail for a new window with a timber frame, to be mounted into external wall insulation, in place of an existing window. Used where a single brick reveal means the original window was originally sat behind, and larger than, a structural opening in the outer face of an existing masonry wall.

This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading structural load of new window and maximising glazed area. The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required).

View in conjunction with Section detail: "New window to EWI, for single brick reveal (section)"

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New window to EWI, for single brick reveal, retrofitted

Detail for a new window with a timber frame, to be mounted into external wall insulation, in place of an existing window; in this case: retrofitted from the outside after the insulation is installed.

Used where a single brick reveal means the original window was originally sat behind, and larger than, a structural opening in the outer face of an existing masonry wall.

This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading structural load of new window and maximising glazed area. The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required).

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Options for new window to EWI, for single brick reveal, retrofit

To be read in conjunction with: "New window to EWI, for single brick reveal, retrofitted" (or EW01-W-RP-FR).Two alternative options for new window installation to a single brick reveal; with either no subframe or reveal; or with a timber studframe support and stainless steel reveal.

Used where a Victorian single brick reveal means the original window was originally sat behind, and larger than, a structural opening in the outer face of an existing masonry wall.

This detail is designed to reduce thermal bridging and improve air-tightness whilst spreading structural load of new window and maximising glazed area. The timber box also acts as self-finished internal reveal. (May be painted/ varnished as required).

View detail →