OSB3 vs PLYWOOD

[sepweijers]

Can I use OSB3 instead of Underlayment ellittios pine? I'm going to finish it with poor man's fiberglass.I'd love to hear your experiences.

[Pmullen503]

Take a piece of each and immerse it water for a week, then decide.

Either way I'd seal the edges with the "mix" (oil based Poly) or epoxy.

[tony.latham]

And do a peel test... I dislike the stuff for a variety of reasons. Screw holding is just one.

Tony

[swoody126]

when (not if) any moisture gets to OSB of any kind you would be very sad you used it

only exterior graded and labeled plywood IMHO

sw

[GPW]

After trying both , we found out we like neither... Both need some kind of treatment to survive... We went to using boards instead ... we used boards for our trailer floor and no problems , and if anything goes awry , they can be replaced one at a time ... Originally we had an OSB floor and that didn't last ... In our Damp climate , plywood always eventually delaminated , despite different waterproofing attempts.

[Steambc]

After trying both , we found out we like neither... Both need some kind of treatment to survive... We went to using boards instead ... we used boards for our trailer floor and no problems , and if anything goes awry , they can be replaced one at a time ... Originally we had an OSB floor and that didn't last ... In our Damp climate , plywood always eventually delaminated , despite different waterproofing attempts.

Just plain pine boards?

[GPW]

Steam , they were "clear and dry" treated pine, well primed and painted , However I have an old all steel cargo trailer with a plain board floor ( untreated, unpainted ), that's still in great shape after many years . I do believe the key is , the sides extend down past the floor , so the floor almost never gets wet .

[tony.latham]

Just plain pine boards?

Keep in mind that boards –-unlike plywood-- swell and contract width-wise as the moisture content changes. I've got a wooden deck on three sides of my home. There's a reason it was installed with gaps. If they were installed without gaps, there would be real issues. Sometimes the gaps are 3/8" and sometimes they are 1/4" depending on the weather.

I've got a utility trailer that's decked with 2" x 6" fir. The same thing happens.

We haul our camper through rainstorms that expose the undercarriage to torrents of moisture and over super-dusty roads. And of course, no dust or moisture gets inside. (The bottom of the plywood floor is sealed with epoxy.)





Tony

[Steambc]

Steam , they were "clear and dry" treated pine, well primed and painted , However I have an old all steel cargo trailer with a plain board floor ( untreated, unpainted ), that's still in great shape after many years . I do believe the key is , the sides extend down past the floor , so the floor almost never gets wet .

Thanks for that info. Good call about the sides extending.

[Steambc]

Just plain pine boards?

Keep in mind that boards –-unlike plywood-- swell and contract width-wise as the moisture content changes. I've got a wooden deck on three sides of my home. There's a reason it was installed with gaps. If they were installed without gaps, there would be real issues. Sometimes the gaps are 3/8" and sometimes they are 1/4" depending on the weather.

I've got a utility trailer that's decked with 2" x 6" fir. The same thing happens.

We haul our camper through rainstorms that expose the undercarriage to torrents of moisture and over super-dusty roads. And of course, no dust or moisture gets inside. (The bottom of the plywood floor is sealed with epoxy.)





Tony

Manes sense, Tony. I'm going to go with a sealed ply floor.

[GPW]

We caulked between our boards ... No problems ...

[tony.latham]

We caulked between our boards ... No problems ...

Glen:

Here in the west, our humidity varies between about 80% (or higher) down to 8% or so. Unsealed wood--especially boards-- can really go for a walk.

And speaking of the weather, she's about -5º at the moment.

Tony