WWilts Posted February 10, 2022 Share Posted February 10, 2022 New build in progress. Cost considerations For various reasons, there will be some penetrations of the external walls (100mm, 150mm, small overflow pipe sized etc). Thinking of buying some EPDM roofing material and cutting grommets as needed, to maintain airtightness. Is that EPDM suitable? Link to comment Share on other sites More sharing options...
PeterW Posted February 10, 2022 Share Posted February 10, 2022 Why ..? Buy the standard products off the shelf that are available … https://www.go-banana.com/products/Lighting-Electrical/Electrical-Accessories/Cable-Accessories/Cable-Glands-Grommets/Pro-Clima-Roflex-Airtight-Pipe-Grommets-6623245.html?variant=Roflex 100 1 Link to comment Share on other sites More sharing options...
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