loft insulation

Jun 30, 2015 5 Replies
S

Hello,



It is been pretty warm in the loft conversion, much warmer than the rest of the house.



I was removing some down lighters from the ceiling and looked up through the hole and I cannot see any insulation. I mentioned in an another post how this loft conversion has all the paperwork and yet has all the power off a 13A fused radial. Is this another cut corner? Surely they should have put some insulation somewhere?



I'm thinking that as well as being warm in the summer it is likely to be cold in the winter. What is the best way to insulate: remove the ceiling and put celotex between the joists?



I'm thinking this would be easiest as if I put celotex between the rafters, don't I have to leave ventilation gaps, which seems to defeat the purpose?



Thanks, Stephen.


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J

Stephen wrote in news: snipped-for-privacy@4ax.com:

There's a government scheme (paid for by the energy companies) to get it done for free. Google Help-Link.

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T

It's about the only way with a loft conversion. But you will need to ensure your wood structure retains sufficient ventilation.

If the outside is tiled with a breathable membrane, 25mm air gap between the membrane and celotex is fine (what my BCO asked for) and you will not generally need any vents.

If the sarking is old style and not breathable, you'll need a 50mm gap and enough vents (in soffit and ridge, or near ridge) to ensure a flow of air on the cold side of the celotex (cold in winter that is).

What can you see though the hole? Sure the insulation has not been stopped short to allow the downlighter to breath?

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T

Oh - and also if you have an impermeable weather layer - eg felt or metal instead of tiles.

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