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We're about to start on a single storey rear extension which will have a suspended timber floor. I've read that (despite the rest of the house not having this) we will need to have concrete poured on the ground under the floor to stop weed growth, but it doesn't mention a thickness or whether some kind of DMP is required as well.
Is this right, and as a layman, I can't see why a weed fabric wouldn't suffice, or even nothing being as we don't have a weed problem anywhere else under the house, or any other house I've seen with a suspended timber floor for that matter.
I'm just wondering how much soil I might need to remove to allow this thickness of concrete and still maintain the minimum 150mm clearance between joists and ground.
Is this right, and as a layman, I can't see why a weed fabric wouldn't suffice, or even nothing being as we don't have a weed problem anywhere else under the house, or any other house I've seen with a suspended timber floor for that matter.
I'm just wondering how much soil I might need to remove to allow this thickness of concrete and still maintain the minimum 150mm clearance between joists and ground.