Boarded loft. What insulation??

[jowniofownio212]

In the process of renovating a 1930s bungalow and as it’s a small build, I wanted to board the loft to use as storage. The joists are 3 ins tall.

Am aware of recommended depth of usual products of 200-300mm.....but want to have gap of 70mm due to boarding floor for storage.....considered loft legs and extra joists on top but some issue for me with those for head room and would take a few days.

anyone know a 70mm product which is good insulation to fit between plaster board and ply boards?

I have seen Celotex but not the best insulation properties. Possibly tri iso 10 is an option. Or any suggestions?

Thanks

 

[foxhole]

So you prefer bodge job to doing an effective job.

 

[jowniofownio212]

Yes that’s exactly what I’m after. Thanks for the helpful advice!

 

[stealthwolf]

What about a warm roof instead? You could insulate the rafters and just board over the joists. It means the loft will be warmer too.

 

[jowniofownio212]

What about a warm roof instead? You could insulate the rafters and just board over the joists. It means the loft will be warmer too.

This could be an option. My roof is an unsealed one and no membrain so tiles straight to the wool frame.

If I was to insulate the roof, it would keep heat in the loft but wouldn’t it have escaped the rooms below?

 

[stealthwolf]

If I was to insulate the roof, it would keep heat in the loft but wouldn’t it have escaped the rooms below?

I'm only a DIYer so I could be talking out of my harris. The aim is to minimise heat loss from the house. If you insulate the roof, it shouldn't be any different than insulating the floor of a loft in a three storey house. If you really wanted to keep heat loss down, it might be beneficial to insulate between say ground floor and first floor. I imagine this is impractical for many unless they're stripping the house down anyway.

https://www.energysavingtrust.org.uk/home-insulation/roof-and-loft