Best insulation in rafters for pitched roof?

Submitted by _CadX t3_z5ieok in DIY

I recently bought a house which had half ass-ed loft conversion done. The conversion itself is fine for what is needed (gaming room). This is quite hard to explain but they didn't convert the wall loft all the way down to the eaves, just in the middle of the loft, so the un-converted part of the loft is just a normal loft space.

With this the radiant heat from the summer months is just to much to be in there, so I am just wondering what is the best insulation to use that goes under where the roof tiles would be?

I've done a little bit of research, I know the main ones are insulation boards, normal wool insulation of the thermafoil type insulation.

I'm in the UK with temperatures rarely getting above 30 degrees Celsius in the summer and below 0 in the winter if that helps.

Thank you for any help in advance.

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EarthBoundBatwing t1_ixw85ul wrote

Take this with a grain of salt, but I know there is closed cell insulation that could be a good option, as well as the stone wool(?) Insulation. Not sure if that's correct, but there is a porous stone type insulation that comes in slabs that is also okay for this type of project.

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_CadX OP t1_ixwjb64 wrote

Thank you, have you got any links to this kind of stuff?

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jnp2346 t1_ixwhx7b wrote

Spray foam insulation would work the best in this instance in my opinion.

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_CadX OP t1_ixwjgu6 wrote

See, I was thinking this, but it seems the jury might still be out? I will admit though that it's quite hard to research this stuff as most of the sites seem to want to sell you setting in one way or another!

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jnp2346 t1_ixwjw1e wrote

Well, foam insulation has the highest R-value by volume as far as I know. I build custom homes for a living. I always recommend foam to my customers because it works so much better than any other readily available products I can access.

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_CadX OP t1_ixwkuau wrote

Ah that's good to hear from someone in the industry! I was hoping foam too as it seems the easiest out of the lot! Is there any links to disposable canisters you can refer me to? Thank you!

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EarthBoundBatwing t1_ixwqf5o wrote

Yes, spray foam is the "closed cell insulation" I referred to. Unfortunately it's not very diy friendly.

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