Plywood floor, tile gap

[mercedism]

I have laid plywood and left a small gap around edge. Once tiles are laid there are certain areas where skirting will sit over it and there are other parts where units will sit over it. But there will be small gaps.

As there are air bricks in the outside wall, what do i use to seal up the edges? Do i use a good low modulus silicon as don't want to waste heat and it too become drafty in there?

[jay]

hi yes silicone is your best bet to allow for movement

[beanz]

Are you saying there will be gaps in the parts that aren't covered by skirting and units? Is this a kitchen, or bathroom, or somewhere else in the house? How big are the gaps? How large is the floor?

[mercedism]

I have roughly set out and didn't want to go hard upto the walls. So if i leave a gap around the perimeter, certain walls will have no kitchen units against them so i can fit skirting over the top and seal there if need be.
But there will be units over some of the others, what i don't want is an air gap. I would like to think 10mm gaps would be the maximum, but if you suggest smaller i will make the cuts tighter.

[365drills]

I would also agree.



If you have laid ply over boards, and left a small gap between the ply and the external wall then silicone would be fine to plug the gap.

Anything bigger then I would be squirting "no more big gaps" into the holes.

I did that to fill in the gap on a floor joist which was too small to get any stuffing into it. The rest of the gaps I filled in with lagging.

But I think you are only talking about a gap of a few milimeters. However if you can get the gaps plugged up ahead of the game thats going to do the best long term job.

I also found by lagging inbetween the floor joists that it cut out a lot of sound. But then its my own home so I wanted to spend the money. For a customer its probably overkill.

[mercedism]

I would have liked to have insulated the floor prior to putting down the ply, but due to time constraints and having loads of other stuff on didn't.

I have some foam but will probably silicon over that as foam is not air tight enough. But will stop it falling down the gap nicely.