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kingspan/celotex etc. equivalent to loft insulation rolls

NewtoDIY
Posts: 126 Forumite
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
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
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Comments
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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.Solar install June 2022, Bath
4.8 kW array, Growatt SPH5000 inverter, 1x Seplos Mason 280L V3 battery 15.2 kWh.
SSW roof. ~22° pitch, BISF house. 12 x 400W Hyundai panels0 -
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=52You may click thanks if you found my advice useful0
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You can see how the Knauf Space Board is put down here: http://www.space-insulation.com/products/space-board-eco/Solar install June 2022, Bath
4.8 kW array, Growatt SPH5000 inverter, 1x Seplos Mason 280L V3 battery 15.2 kWh.
SSW roof. ~22° pitch, BISF house. 12 x 400W Hyundai panels0 -
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?0 -
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.0 -
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!0 -
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Is this for Building Regulation purposes or for your own benefit?0
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