Help with loft floor please

nickyvicar · 23 May 2006 at 8:33PM

We used to have storage space in our loft aound the hatch, half-a-dozen pieces of chipboard on the joists. Last winter we had the loft re-lagged, of course, now the insulation is 10" thick. Anyone have any ideas how to fit the floor back without compressing/removing the lagging?
I had thought maybe slitting the lagging, then some noggin type jobbies on top of the joists. Anyone any ideas?
Ta
Nick

Mr_Proctalgia · 23 May 2006 at 8:53PM

Take out the insulation in the area you want to board and replace it with 100mm kingspan, its pricey but a good product. Cut it to width and lay between ceiling joists. Do watch out for cables and plumbing!!

Blue_Lou · 20 June 2006 at 4:45PM

I was going to ask the same question as nickyvicar did, however I dont think I agree with Mr Proctalgia's response.

I have been looking into raising the joists on the floor using additional 2 x 4s. Which would enable me to screw in loftboards into the new joists and we would have a completely boarded up floor and 270mm insulation below.

Could anybody tell me which would be more viable, removing the insulation and replacing it with thinner insulation as above says or investing in a few timbers and screws to raise the loft flooring slightly.

EasilyAggravated · 20 June 2006 at 6:54PM

remove the insulation. buy 2x4s. then cut insulation to fit. its easier and probably cheaper. plus it would make the floor more stable and stronger

Blue_Lou · 20 June 2006 at 8:23PM

Thats what I was thinking. Glad you agree.

Wig · 22 June 2006 at 9:03PM

You want 4inches of insulation in the existing joist space, then put 2x4's or 2x6's (OP said they have 10" insulation).

But lay the new 2x4's at 90 degrees to the other joists - fixing with metal brackets on all or most of the crossover points. Then run the insulation the other way across the tops of the lower joists.

Or you can use Knauf laminated "polyfoam supadeck" which is really expensive, 100mm foam laminated with loft flooring chipboards, and it sits on top of your joists thus allowing 8" insulation. My bargain of the decade was picking up 22 boards of this stuff from TP for 40 quid !!!!!!!!!!!!!!!!!!!!! :j

Another cheaper alternative solution would be to do as Proctalgia suggests but to put the kingspan (or any 100mm polystyrene or XPS ) on top of the joists and cover with flooring boards, you could if you wanted put some 8mm ply on top of the joists before putting the foam depending how good your foam is.

Help with loft floor please

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