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- 9 Oct 2014
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Hi, I'm insulating my old workshop (timber frame, walls sit on brick & concrete block walls), and am currently about to start insulating the suspended floor. Have taken out the old chipboard flooring to expose the joists. The plan is to cut 90mm Xtratherm insulation boards to fit between the joists. Then cover the lot with a vapour barrier. Then put down ply flooring.
The ends of the joists sit on a "shelf" on short wall of bricks (and they sit on loose laid strips of a damp proof type material). There is a DPC on the top of the bricks and under the sole plate (ie. level with the top pf the joists). Diagram attached.
If I put insulation boards between the joists, the tops of the boards will be level with the DPC. The insulation boards will therefore be effectively sitting below the DPC. My question is - does this matter?
If the insulation boards must sit above the DPC, then my floor will end up being raised by 90mm (plus flooring). Which will be a right pain.
(And yes there are air bricks but have already established ways round that. It's the DPC that I'm now worrying about!)
Thanks.
The ends of the joists sit on a "shelf" on short wall of bricks (and they sit on loose laid strips of a damp proof type material). There is a DPC on the top of the bricks and under the sole plate (ie. level with the top pf the joists). Diagram attached.
If I put insulation boards between the joists, the tops of the boards will be level with the DPC. The insulation boards will therefore be effectively sitting below the DPC. My question is - does this matter?
If the insulation boards must sit above the DPC, then my floor will end up being raised by 90mm (plus flooring). Which will be a right pain.
(And yes there are air bricks but have already established ways round that. It's the DPC that I'm now worrying about!)
Thanks.