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Re:Winter Construction

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mdjd4020

Member
The OSB of what you speak is not real plywood. It is oriented strand board, thus the OSB. It is just large particles of wood glued together and not very strong. Most nails won t hold it very good or very long. You re better off screwing it down, or using real plywood, especially if you are in a windy location.
 
Out here in earthquake country it seems to have worked at least as well as plywood. It is approved for shear walls. My building inspector said that OSB has more glue in it and that the random fiber placement of the chips offers betterer shear resistence than the plywood. Often the plywood has voids, that never happen in OSB. He also told me it is a completely different product than the chip board they used on all those houses in Florida that the hurricans tore up. I have no idea if any of that is true. I do know that it costs less.
 
I don't like OSB, but they are building houses out of it. It is not as strong as plywood, but it is cheaper, thats why it gets used.
 
Well, I'm not a fan- I used it to sheet a woodshed roof, then put on asphalt shingles with roofing nails. In a number of places, the nail pushed out a chunk of OSB an inch or so in diameter where it came through. No strength at all. Guess it would be allright for sidewall underlayment, where you're nailing through it and into studs.

My dad was a carpenter all his life, and he called it "crapboard".
 
We use the Sh!! board-OSB board on side walls only. We try to cover it as soon as it is nailed on with Tyvek to keep it from growing. 7/16" when it is dry will grow to 5/8 real quick when the ends get wet. On roofs we use 5 ply fir plywood only. This last house we are on it was running $15 plus a sheet versus $7 for the OSB. Was on a roof for a guy one time with the OSB. Didn't even feel comfortable walking on the crap. Shingler say's he can sure tell the difference when he gets on our roofs. There is more than one kind of OSB. Seems the 9 ft. sheets have smaller strands and more sawdust to them but are deffinately stiffer than the 8ft. stuff which has bigger chips. Take a wack at that stuff with a hammer some time and see how it blows apart. Then try it with a 5 ply plywood. There is cheaper plywood that is used also. It is made from pine and is not as stable as the fir. I tried that once and never again. Sometimes you actually get what you pay for.
 
We only use it for walls. We've found that the best way to fasten it is with staples. They hold like no other nail or screw can. If you have an oops or a window change you'll pull the osb out in pieces before you'll get the staples out. I've put osb on other builders roofs before and I am not a fan. Especially if your (inexperienced) cut man gives you the piece upside down. We do regular 1/2 inch ply for the roofs and that is much better. The job I am on right now we are using 5/8 fire treated ply for the roof. Nice for the roof but heavy to use. This is for the Army, and we are installing all fire treated (resistant=big $$$$) lumber on top of a 95 year old building. So if all the original wood in the building burns, the new trusses and plywood will still be there. Good to know I'm paying for this with my taxes.
 
I had to agree with most everyone on the osb until we were building a home for a customer and used 7/16 osb and came up one sheet short. Went to the lumber yard to get more. They were out of the osb so I got a sheet of 1/2" cdx fir. It was on the roof at the ridge where you always have a smaller cut piece. When you stepped on the osb verses the cdx the osb had way less flex to it. I would not have believed it had I not done a side by side comparison. Steven
 
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