- A DPC (damp proof course) is not needed under the window sill. Only the sill and inner wall/sill need DPC1. If a jointed or permeable sill is used, a DPC should be placed between the sill and the outer leaf, turned up at the back and ends of the sill2. Water leaking in at the window sill may bypass the DPC built in under the window sill as a water-resistant barrier, causing moisture to appear as bubbling paint or crazing cracking of plasterwork, or both, below the window, extending down to floor level3.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Do You Put DPC Under The Window Sill? No. Only the sill and inner wall/sill need DPC. The old sill isn’t needed. This is because a sill that has the potential to be damaged is needed to support the weight of a window. By fully supporting it, you are allowing it to hold up the weight of the window.www.hpdconsult.com/do-you-put-dpc-under-the-wi…Where a jointed or permeable sill is used, a DPC should be: placed between the sill and the outer leaf turned up at the back and ends of the sill. At sills where there is: a DPC, it should be lapped with the reveal DPC no DPC, the vertical DPC should be continued 150mm below the sill level.nhbc-standards.co.uk/6-superstructure-excluding-r…Water leaking in at the window sill may bypass the damp proof course (DPC) built in under the window sill as a water-resistant barrier. The moisture may then appear as bubbling paint or crazing cracking of plasterwork, or both, below the window, extending down to floor level.www.thehomedetective.co.za/window-sills/
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