kingspan/celotex etc. equivalent to loft insulation rolls

NewtoDIY

Sorry if this has been clarified elsewhere but can someone tell me which rigid products would be the equivalent of 210mm (or thicker) loft insulation?
I've a Victorian house with 28cm wide joists in the eaves and want to use the space for light storage, so need to keep the height of insulation down. Any specific product recommendations would be welcome also.
Thanks

ed110220

I used 100mm of loft insulation between the noggins and girders (system-built roof so no joists) and then Knauf Spaceboards on top, then finished off with ordinary chipboard loft boards.

Ideally you should use two layers of Spaceboards to get the recommended level of insulation (270 mm equivalent I think) but I only used one as two would mean raising the loft ladder attachments etc.

muckybutt

We used Actis multi foil insulation for a loft conversion, b/c had no problem with signing it off http://www.insulation-actis.com/produits-actis.php?p=3&l=3&rub=52

ed110220

You can see how the Knauf Space Board is put down here: http://www.space-insulation.com/products/space-board-eco/

NewtoDIY

Knauf Spaceboard seems quite thick (and complicated) when you use the recommended amount. I was thinking that something rigid in the kingspan range would leave me more space to use for storage. The gap between joists is only 28cm so I was thinking about insulating those with loose fill insulation (to guarantee that those spaces are insulated), and then board on top with something rigid followed by boards suitable for walking on.
Is there anything rigid upto say 100mm in height?

A.Penny.Saved

You can get Kingspan and a cheaper Irish manufactured board, which is sold by EH Smith, which are over 100mm thick so you could use those. It might be best to avoid foil backed boards to avoid a build up of damp. The thick insulation gets quite expensive!

I'm thinking of doing a similar thing near the eves due to a low roof pitch.

NewtoDIY

A.Penny.Saved wrote: »

You can get Kingspan and a cheaper Irish manufactured board, which is sold by EH Smith, which are over 100mm thick so you could use those. It might be best to avoid foil backed boards to avoid a build up of damp. The thick insulation gets quite expensive!

I'm thinking of doing a similar thing near the eves due to a low roof pitch.

Thanks for this. Will check it out ASAP!

A.Penny.Saved

Ballytherm I believe is the Irish firm name.

http://www.ballytherm.ie/insulation/

DevilDamo

Is this for Building Regulation purposes or for your own benefit?

NewtoDIY

DevilDamo wrote: »

Is this for Building Regulation purposes or for your own benefit?

Mostly for our own benefit. But it never hurts to do something correctly and add value also.