Plywood over floorboard question

[pippo]

Hi,

I had uneven floorboards and on the advice i had from this forum i put down 6mm ply. It has improved which is great. I do however have some gaps between boards where i have had to cut them to fit as I only had a jigsaw and couldnt get it perfectly straight. We intend on carpeting with a good quality underlay however I am concerned about the carpet sagging into these gaps. some gaps are 3-4mm wide.

Is there something I can put in these gaps? ie silicon, or would it pop out as the board expands/contracts. Or perhaps some kind of loose fill like sand or something.

ps the boards are large 8x4 ft.

thanks in advance for any advice

pippo

 

[pompeyal]

I wouldn't think such as that would cause a problem but if you want to fill these gaps, put in decorators caulk, it sets quicker than mastic and has some flexibility.

 

[pippo]

Thanks pompey, I'll give that a try.

Pippo