OSB3 or chipboard flooring?

[Ben100]

Hi all,

 

I've been working on my flat roof construction and have plenty of 18mm T&G OSB3 sheets left. I was planning to use these for the first floor flooring in the house refurbishment, but have been told by a local building that I should use chipboard flooring instead. Any idea why this would be? thanks!

[PeterW]

What are your floor joist spacings..? 18mm is only suitable for 400mm centres

 

P5 chipboard is the norm - 22mm is pretty standard and I wouldn't use anything else really.

[Ben100]

7 minutes ago, PeterW said:

What are your floor joist spacings..? 18mm is only suitable for 400mm centres

 

P5 chipboard is the norm - 22mm is pretty standard and I wouldn't use anything else really.

 

The joists are 400mm centres.

[PeterW]

OK so you could use the OSB but its not ideal as it isn't that smooth or waterproof. How much have you got left..?

 

Any chance the supplier would take it back on credit..?

[Ben100]

3 minutes ago, PeterW said:

OK so you could use the OSB but its not ideal as it isn't that smooth or waterproof. How much have you got left..?

 

Any chance the supplier would take it back on credit..?

 

I've got around 40m2 left. Maybe I could use it on the roof instead...

[Mike]

Check the BBA certificate for the brand of OSB that you're using, just in case, but in general 18mm OSB3 is suitable for flooring over 400mm centres (potentially up to 600mm).

 

For bathrooms & shower rooms I would personally upgrade to an external plywood.