Patch osb floor

BarraOG · 18-10-2025 01:08PM #1

Laying a laminate floor over osb. There is depression on the floor that is 8mm deep at the worst spot. It forms a channel near where two boards join. How do you recommend I fill it? It’s about 30cm long 20cm wide. See attachment.

IMG_8354.jpeg

banie01 · 18-10-2025 01:11PM

Wood filler, levelling compound, perhaps even tile adhesive if you have time to let it dry before flooring.

BarraOG · 18-10-2025 01:37PM

I’ve plenty of time. I’d like to do it right. I have tile adhesive, would you recommend that? I even have primer for it.

Explosive_Cornflake · 18-10-2025 01:44PM

I'd lift the OSB, andmget the joists underneath level with a strip of wood, and put the OSB back down. Use glue and a few tacks to attach the strip of wood do it doesn't squeak. Is you have a track saw/table saw it's an easy job.

DC999 · 19-10-2025 09:55AM

https://www.boards.ie/discussion/comment/123915502#Comment_123915502

+1

BarraOG · 22-10-2025 09:36PM

https://www.boards.ie/discussion/comment/123915502#Comment_123915502

Thanks, I think the issue is more that the osb dips between the joists. You can see that the lowest point in the attached picture is quite near the joist where the two boards meet. The dip runs more parallel with the joist. Not sure why this dip is there.

The Continental Op · 22-10-2025 09:38PM

https://www.boards.ie/discussion/comment/123929253#Comment_123929253

Then as above and add some noggins to support it when you put it back.

tabby aspreme · 22-10-2025 10:06PM

https://www.boards.ie/discussion/comment/123929253#Comment_123929253

How wide is the spacing between the joists

Patch osb floor

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