WWilts Posted June 7, 2023 Share Posted June 7, 2023 100mm black rigiduct being installed across driveway (occasional lorries). Rainwater drainage. How to reduce risk of crushing? Current plan: dig trench 200mm deep, cover with 100mm backfill of type 1. For bed, would pea shingle or lean mix help? For cover would concrete help? Link to comment Share on other sites More sharing options...
Conor Posted June 7, 2023 Share Posted June 7, 2023 I'd encase the whole thing in lean mix concrete. 100mm type 1 on top isn't near enough. 1 Link to comment Share on other sites More sharing options...
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