WWilts Posted December 18, 2021 Share Posted December 18, 2021 110mm cavity wall, block inner, brick (or stone) outer leaf. Cavity insulation: pumped in bonded EPS beads (after cavity openings are closed & windows/doors installed). Window/door installer would normally fit uPVC windows without any overlap of the cavity insulation. If we want overlap of the cavity, they suggested inserting timber across the cavity into which they could fix the windows (screws). Will cement board do the job? Insulation will be available from pumped in beads, only objective is something that can withstand moisture (perhaps resist fire) and can bear the weight of uPVC windows. Link to comment Share on other sites More sharing options...
Iceverge Posted December 18, 2021 Share Posted December 18, 2021 (edited) Cement board won't do to take any weight. We rested ours on the external concrete sill and bolted them with angle brackets to the outer leaf. The sill and the window reveals were then added from OSB afterwards. Edited December 18, 2021 by Iceverge 1 Link to comment Share on other sites More sharing options...
bassanclan Posted December 19, 2021 Share Posted December 19, 2021 Get them to use window straps 1 Link to comment Share on other sites More sharing options...
WWilts Posted December 19, 2021 Author Share Posted December 19, 2021 17 hours ago, Iceverge said: We rested ours on the external concrete sill How about doing that + external wall insulation installed on the external face of the window frame or door frame To prevent heat loss regardless of how the frame is fixed to the cavity wall Link to comment Share on other sites More sharing options...
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