Raise floor under carpet

RichA · 2 Jun 2019

I would like to raise my sitting room floor by 5-10mm before installing new underlay and carpet (to reduce the difference up to the hall).

The room is approx 4m x 5m, has floorboards with a 600mm cavity underneath; as there is no insulation and I thought I may be able to use something that may also reduce draughts and possibly add some insulation properties.

What are my option for raising the floor? Would a woodfibre underlay board be suitable?

Possibly one of these:
https://www.screwfix.com/p/wood-fibre-underlay-boards-7m-15-pack/7824R
https://www.screwfix.com/p/vitrex-premier-wood-laminate-underlay-boards-5mm-9-76m/68038?

blup · 2 Jun 2019

Both Q&A's on the Screwfix site suggest they are unsuitable for carpet.

A thicker conventional rubber underlay might help with insulation

If it's difficult to raise the overall floor by that small amount, an alternative is to use a suitable carpet cover strip at the door opening.

Blup

RichA · 2 Jun 2019

Would hardboard be an option?

foxhole · 2 Jun 2019

8x4 sheets of hardboard would easily raise height and are ideal for under carpets , rough side up .
Prevents uneven floor boards showing through .

dazlight · 3 Jun 2019

Use 6mm or 9mm plywood. A lot stronger then hardboard.

foxhole · 8 Jun 2019

dazlight said:
Use 6mm or 9mm plywood. A lot stronger then hardboard.

Does not require any strength.

crazydaze · 14 Jun 2019

foxhole said:
Does not require any strength.

Ply will be alot more dimensionally stable and feel better as a subfloor layer than hardboard.

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Raise floor under carpet

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