I have a section of my loft which I use for storage, nothing particularly heavy just the usual bits and bobs. I am going to put 100mm celotex/Kingspan down for insulation and was wondering if I need to put any board on top?
There are some boards already on the joists so it will be supported.
Would hardboard be sufficient to protect the insulation? I don't think I'd be storing anything that would be likely to get through that.
is there some special tape for sticking sheets of insulation together? I'd be using 8 * 4 sheets but would have to cut them into 8 * 2 sheets to get through the loft hatch.
The centre area of my loft was already boarded with a mixture of materials that had accumulated over the years.
I then covered this with two layers of Knauf space board insulation,(1200 mm x 500 mm x 50 mm) with the joints staggered.
As I needed to hold everything down, and the insulation will dent from point loads such as bony knees and storage box feet, I covered it with hardboard (full sheets cut across into 500 mm strips {plus off cuts} at B&Q) and screwed it all down to the boarding using M6 x 120 mm woodscrews which were on offer at CPC.
I was very pleased that the installation went exactly as planned. I did drill pilot holes, but the screws would probably have self-drilled.
The only slight problem, which became apparent after a few weeks, is that (despite the fact that the hardboard spent some of the autumn stored in the caravan, until I could get the job done) the sheets have expanded slightly and bowed a little. I haven't been up there recently to see if the summer weather has shrunk them back.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.