"Weatherlawyer" wrote in message
oups.com...

Dave Page wrote:
I am planning on insulating my loft to the recommended 270mm, and would
also like to lay floorboards above the insulation so I can keep using
the loft for storage. The gap between the ceiling and the top of the
existing joists is 70mm, so there's 200mm to go.

I'm intending on adding two strips of 40 x 100 on top of the existing
joists, screwing them down, and laying the insulation between them and
boards on top. It seems like a fairly simple job.

There's one bit of information I'm missing; what sort of timber would be
appropriate for this job?

First thing get the cheapest offer you can with the insulation. But for
heaven's sake phone around all the other places too first. Builders
merchants not only stock it they deiver.

Secondly, why are you intent on adding timber? If you must walk around
up there for maintainance in the future all you need is a walkway built
up. If that. You could just lay a plank or two over the wool.

The rolls of insulate come in bags of three, sometimes you have to cut
them apart. But if you lay them crosswise over the beams you can lay a
full three rolls at a time.

Remember there must be a draught
in the roof at all times as the amount
of moisture that vents through it
is quite amazing.

As he is removing the old insulation, it is best seal up the holes where
cable and pipes penetrate with silicon, then lat a poly vapour barrier on
the plasterboard/joist. Pin it with a staple gun to side of the joists and
tape the joins with big overlaps. Then lay the insulation and lay the new
joists. Then make sure the hatch is sealed and insulated too.