Actually, they orient the strands in OSB in alternating layers. Just as with
plywood, they run the chips so the grain runs lengthwise in one layer,
crosswise in another layer, so you get a balanced material that's has much
the same properties as plywood, and is stronger than solid lumber.
Dan Weeks
'75 Argosy 26
(Former building editor who's taken a few wood product industry factory
tours!)
> From: "Robert / Susan Harper" <[EMAIL PROTECTED]>
> Reply-To: [EMAIL PROTECTED]
> Date: Thu, 25 Jan 2001 08:17:15 -0500
> To: Multiple recipients of VACList <[EMAIL PROTECTED]>
> Subject: [VAC] OSB Floor?/floor patching
>
>> Having never replaced bad flooring I thought I would cut out the
>> damaged part and replace it with marine plywood. Is this how it's done?
>> (Not to be minimizing the effort involved.) >Jim Greene
>
>
> Jim, I had just a couple of small (about 3 sq. ft.) spots to patch, and I
> used standard 3/4" AC (maybe it was BC)exterior plywood, but I had to reduce
> the thickness slightly where it laid on frame and cross member parts to make
> it flush on top. I did not go for a perfect fit, but left about 1/16" gap
> around the edges between patch and orig. floor. After bolting the patch to
> frame, I shot expanding foam (Great Stuff) into the gaps I'd left. When it
> set, I flushed it up top and bottom, then installed a bridging patch (strips
> of same plywood) on the bottom side of the plywood floor (belly pan off).
> The patch had to be reduced in thickness where the bridging patch laid also
> (easy if you have a table saw). The bridging patch was installed with
> polyurethane glue (one part, I used Franklin) and lots of screws. Then I
> painted everything from the bottom with enamel primer.
> Water hurts plywood the fastest by getting in at the edges. The cell
> structure of the wood is such that it is drawn in like a straw on the "end
> grain", which is exposed on every other layer on plywood edges.
> Even if you patch with OSB or marine plywood, it wouldn't hurt to take
> precautions to seal edges. Sealing the faces is good, too. OSB is good
> stuff, because of the "O" part - oriented. That means they line up the chips
> in a linear fashion in the sheets to give you that same type of strength you
> get in solid lumber. But you'd be wise to further protect it from moisture,
> since any leaks could go undetected for quite a while.
>
>
> Bob Harper
> '62 Globe Trotter in SC
>
>
>
>
>
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