[izzy]

I'm at the stage in my recent build that I will sand the joints in my sub floor with a floor sander to ensure flatness. Just curious if any of you guys do the same. I started doing this a few years back. It helps out with any hard surface finish flooring that will come later.

 

[KennMacMoragh]

Yes, I've done it many times. I used to work for a company that would spray paint the high spots on every house, then we would go around with a hand held floor sander and grind them down. I wouldn't take off more than 1/8 of an inch though, if it has to go down more than that, take off a section of sub-floor and cut back whatever is causing the hump.

 

[pinwheel]

I do it on every new const job where I lay hardwood. Especially if it's been exposed to much moisture.

 

[genecarp]

TJI joists, 3/4'' T&G plywood, whats to sand, GMOD

 

[izzy]

TJI joists, 3/4'' T&G plywood, whats to sand, GMOD

It is TJI's 16"oc with 3/4 T&G advantech but you still get some edge swell or milling difference. Also advantech does recommends sanding, just curious who else sanded it.

 

[KennMacMoragh]

TJI joists, 3/4'' T&G plywood, whats to sand, GMOD

I have only ever had to do it with either floor trusses or real wood joists.

 

[pegasush]

Sand every time - for hardwood finishes. Flatness criteria from manufacturers are pretty clear and not hard to meet, but a single swelled joint is a major headache after.