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Hi Does anyone have any suggestions as to what I could use as 'rigid sheet material' to put underground to cover the openings at both sides where my underground drainage pipe runs under a lintel? Building regs just states 'rigid sheet material' rather than anything more specific in terms of a...

Good morning Apologies for what may be a stupid question, but I have a query regarding the dpc/dpm check that is carried out by the BCO. Am I ok to backfill both internal & external walls where I have dug out & built my underground blockwork in prior to the bco coming out for this visit or...

Hi all am hoping for a bit of advice please. Am building an extension and building control have requested that I install a gas membrane (methane / co2) across the entire footprint of the building. I understand that I must fit this & incorporate it as a cavity tray between inner & external...