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Building Material OSB???????

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Mark

06-28-2003 18:54:46

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Just wondering what the current thoughts are on the use of OSB? I see alot of development houses around here being built with the stuff. Anyone have experience when compared to plywood sheathing??

I value my labor and time more than saving a few bucks on material. I ain't a big fan of these new plastic houses.

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07-08-2003 19:14:51

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

The TV news ran a story a few weeks ago about OSB being very strong, but it BURNS at a very fast rate. Firemen are already very leary of the stuff, and are giving it some nasty nicnames. Seems like everything has it's compromise.....
OSB is strong and cheap, but burns fast. Also, interestingly, metal studs don't burn, but if in a fire, their collapse rate is quicker than regular wooden 2x4's..... the wood chars first, whereas the metal studs bend and twist down from the heat.
Food for thought.....

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Hayman

06-29-2003 19:31:36

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

Plywood is four times more permeable to water vapour than Oriented Strand Board.This means that any water in your wall cavity cannot escape very well because of the vapour barrier to the lnside and OSB sheathing on the outside. Here in the Northwest we had the leaky condo syndrome. OSB and new rules allowing no roof overhangs made for leaks that could'nt dry =rot.

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Bus Driver

06-29-2003 11:26:22

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

True OSB and wafer board are different products. OSB has long strands and they are mosly oriented the long way of the panel. Even some sellers of the panels confuse the products. Wafer board has particles that are more round in shape. OSB will handle loads over spans better- like the space between joists and rafters. It probably will be stamped as OSB. Any material must be properly installed to realize the potential in the product. Overdriving of nails and staples very seriously damages the strength of any panel product- including plywood.

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Charles(Mo)

06-29-2003 05:19:45

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

I built a new shop/garage in April of 2002, and used OSB. When I got the gutters and down spouts done, I layed a small piece of OSB under 1 of the down spouts to keep the water from washing out a hole. Just a temporary thing(grin) until I could do it right. Well it has been 14 months and that piece is still there and it looks almost like the day I layed it there.

My brother is a contractor, been in the business for 30 years, and he uses it all the time. He uses plywood when it is cheaper. Seems like the prices go up and down.

Charles

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Halbert

06-29-2003 07:48:11

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Re: Re: Building Material OSB??????? in reply to Charles(Mo), 06-29-2003 05:19:45

How does the nail/staple holding ability compare to plywood when applying roofing shingles?

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Gary in IL

06-29-2003 17:36:11

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Re: Re: Re: Building Material OSB??????? in reply to Halbert, 06-29-2003 07:48:11

My shop was built in 90, added to in 95, been thru some pretty fierce winds, including an alledged '90 mph straight-line wind' (yeah right) that snapped off 4" fence posts level with the ground, I lost no shingles over the years

original building had hand-nailed shingles, addition had them power nailed.....BUT I was careful to seek advice on how to set the nailer so as not to over-drive them.

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Halbert

06-30-2003 09:57:03

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Re: Re: Re: Re: Building Material OSB??????? in reply to Gary in IL, 06-29-2003 17:36:11

I would say the main reason your job turned out well is you did it yourself and you did it right. One thing about hand-nailing is if you hit a less dense spot you will know it and can put in another nail or whatever; maybe OSB is more uniform in density than plywood. Also I have noticed that sometimes when workers are trying to make time with power nailers they have a tendency to nail too high on the shingle.

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Charles(Mo)

06-29-2003 09:55:56

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Re: Re: Re: Building Material OSB??????? in reply to Halbert, 06-29-2003 07:48:11

It must hold the nails pretty good. My brother doesn't like to lose money or business because of call backs. And so far the roof on my shop looks great. No nails pushing up the shingles. Also, if that was a problem, I know that I would hear about it from my brother or a good friend that owns the local lumber yard.

Charles

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VaTom

06-29-2003 10:24:06

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Re: Re: Re: Re: Building Material OSB??????? in reply to Charles(Mo), 06-29-2003 09:55:56

Following Hurrican Andrew (1992), Dade County rejected OSB due to failures. They also rejected stapling all roof decking as the staples sometimes went too deep, causing failure.

The following is a different perspective:

http://www.umass.edu/bmatwt/publications/articles/osb_vs_plywood.html

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Robert in W. Mi

06-29-2003 13:59:56

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Re: Re: Re: Re: Re: Building Material OSB??????? in reply to VaTom, 06-29-2003 10:24:06

The reason there were OSB failures wasn't because of the OSB. It was because the nails shot into it went too deep. unlike plywood, OSB looses a lot of strength when "over nailed". All the habitat for humanity houses did well in that huricane, but the OSB was hand nailed with the nail heads flush, instead of staples or power nailing with the gun out of ajustment pushing them too far in. Robert

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VaTom

06-29-2003 15:12:06

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Re: Re: Re: Re: Re: Re: Building Material OSB????? in reply to Robert in W. Mi, 06-29-2003 13:59:56

(chuckling)

Robert, I guess you didn't follow the link. UMass concluded Dade County was wrong and that OSB was actually superior in many, but not all, applications. You're right on about the hand nailing. Asphalt shingles work exactly the same way.

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Robert in W. Mi

06-29-2003 19:34:02

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Re: Re: Re: Re: Re: Re: Re: Building Material OSB? in reply to VaTom, 06-29-2003 15:12:06

Nope didn't follow the link. Many times those links are just too much to go through, so i skip them. I'll bet there's quite a few that feel the way i do.

What i posted above was what i learned from a couple documentaries i saw after the hurricanes about how those houses came apart. They had very good video showing it all. The shows were on PBS.

Robert

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Corn Borer

06-28-2003 22:16:00

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

This is interesting to know, as I am writing some specifications for building my shop/apartment, and I did not want any particle board used in the construction, and was going to put that in the contract material specs. Better to spend a little more now, than to have it dissolve in the first dew.

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evielboweviel

06-29-2003 16:57:06

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Re: Re: Building Material OSB??????? in reply to Corn Borer, 06-28-2003 22:16:00

you will need particle board as underlayment for counters and possibly else where. Highly recomend the new made from wheat straw board.

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F14

06-29-2003 03:26:03

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Re: Re: Building Material OSB??????? in reply to Corn Borer, 06-28-2003 22:16:00

First, understand that there is a BIG difference between 'particle board' which is made of something like sawdust, and OSB (Oriented Strand Board) sometimes called chipboard. Particle board is NOT made for exposures. Personally, I wouldn't build a bonfire out of the stuff.

OSB, on the other hand, has indeed come a long way. I've used a lot of it in sheds and such, and have two sheds that are sheathed with it that I haven't gotten around to siding yet. One is more than 10 years old (yeah, I know...) and has shown no signs of the swelling or flaking that OSB used to be famous for. At the price, I don't see how you can beat it.

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Jim WI

07-01-2003 10:37:18

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Re: Re: Re: Building Material OSB??????? in reply to F14, 06-29-2003 03:26:03

If by "particle board" we're talking about MDF (medium density fiberboard), it has perfectly acceptable uses. It's dimensionally stable and paints well. I wouldn't use it for sheathing -- that's not what it's for.

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Mike

06-28-2003 19:26:12

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Re: Building Material OSB??????? in reply to Mark , 06-28-2003 18:54:46

OSB has come a long way in the last 15 years. Now it can be used in just about any place as plywood. Even alot of the old timers are starting to use it. Look at most new houses and they are built with alot of new technology ie laminated veneer lumber beams,composite decking(outside),wood Ibeam floor joist systems etc. etc.
We(the lumberyard I work for)now have a new osb garranteed not to swell when it gets wet.

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Vern-MI

06-29-2003 04:20:21

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Re: Re: Building Material OSB??????? in reply to Mike, 06-28-2003 19:26:12

Is all new OSB then considerd waterproof or does the OSB have to be ordered special to be waterproof? I have noticed that in new underlayment flooring made of OSB that the "Chips" seem to stick up and get pretty raggy when they have been rained on. I can't imagine that putting a piece of furniture like a piano on that type of flooring would be very good.

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Burrhead

06-28-2003 19:46:41

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Re: Re: Building Material OSB??????? in reply to Mike, 06-28-2003 19:26:12

I patched a shed with some of the non swelling 2-3 years ago. The lumber yard said it was warranted for 5 years against swelling.

I have'nt painted it or protected it in anyway cause I was gonna get him out here to replace it the next spring. So far all it has done is turned dark brown.

I went back and got 2 sheets to lay on when I work on a tractor or truck in the feild and so far they have'nt swelled, not even with mud left on them.

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