Here are the results of shooting a 2" x 4" at both materials.
OSB vs. Plywood
fjn
21 - 40 of 61 Posts
If a broken window is a house failing, then I guess you got me. I could counter that you may have one instance in a neighborhood of 100 houses with windows covered where a 2x4 hits directly enough to cause that result. I would counter that with each homeowner saving $50by using osb, which is a savings of $5000. I can buy and install a bunch of windows for 5k.The video did just show you a house failing. I guess you are o.k with flying debris coming thru your walls.
I'm not advocating titanium walls,how about just something like solid wood or at the least plywood. If you are not able to recognize / accept this video for what it is,so be it.
I wasn't talking windows,I was talking walls. Plastic siding covering osb sheating is a recipe for disaster. Wind blown debris is coming right thru. At least with plywood sheating you have a fighting chance it will get stopped.
Plus the windows are only the tip of the iceberg. It is a proven fact once windows are knocked out in high winds,the chances of keeping the roof on are greatly diminished.
That small hole in the osb does not represent the window getting taken out. Like I said, I agree that the plywood is better for boarding up windows. But you will not have a bunch of 2x4 type objects spearheading at multiple areas of a house like they show in that video. You can think what you want, but even if I was building in Florida, I am sure I would continue to recommend osb.
Fred, gotta say I'm with Warren on this one. Sure, plywood will do better than OSB with a direct point load shot, but in reality the odds of that happening as depicted in the video are pretty low. The odds of it happening to multiple windows are lower yet.
Common sense says that you don't spend $2-3K to protect against the chance of one or two busted windows. And as for wall sheathing, a 2x4 hole in the wall isn't going to do diddly in terms of blowing the roof off.
Common sense says that you don't spend $2-3K to protect against the chance of one or two busted windows. And as for wall sheathing, a 2x4 hole in the wall isn't going to do diddly in terms of blowing the roof off.
Kind of not true, but kind of is. A 2X4 hole could be the straw that breaks the camel's back in a lot of situations. The push of a hurricane is really intense but when you throw in negative pressure it can be a disaster. It pulls a chunk from that hole and then more because the walls ade sheated with OSB and everything is getting wet for hours and becoming compromised.
All that being said. In reality and not some test... OSB walls seem to hold up every bit as good as plywood through the storms. Plenty of the new developments down near Naples were osb multi family units and they're fine in 145 mph winds with Irma. I live in a house that has plywood, really it is all about shear and uplift because almost all houses have large overhangs (porches).which create that dangerous negative pressure.
Pretty rare something is coming 145 mph straight on. It's flopping in the wind like everything else. What you really have to worry about is the neighbors roof coming into yours or their junk lying around. Not so much what your walls are built out of because the 2x4 is much more likely to come and hit on a flat or an angle instead of maximum destruction.
They will peel a roof off and toss it though. And yeah, the things people put over their windows is silly. OSB would do absolutely nothing because it gets rained on for hours on end before the wind comes.
And the (the southeast) are the dumbest part of the country comment just proved we're only in second place...
If you want a house that will stand up to a hurricane, it's going to be reinforced concrete with barred windows and metal shutters over the bars. There isn't any exterior plywood involved.
If you have 2X4s flying through the air, frame houses are being torn apart.
Surrounding a house with berms would help a lot, but you have to be able to get rid of the water.
If you have 2X4s flying through the air, frame houses are being torn apart.
Surrounding a house with berms would help a lot, but you have to be able to get rid of the water.
Joined
·
72,840 Posts
Exactly. :thumbsup:
I trust my engineers. I'm never going to use more than the numbers require. Why would I do that?
Mike.
_______________
[emoji631] [emoji631]
Florida disagrees with Warren from what I hear.In Tampa, we haven't had a direct hurricane hit in 100 years, far from a prone area. In fact many live here because of just that - they almost always seem to skirt around us somehow. Almost always :whistling.
Anyway, most houses around here are built fairly well, C block. But we like our glass too, tall arching glass and much not hurricane/ missile glass since most were built pre-hurricaine Andrew which seemed to change some codes for the better. As for irresponsible homeowners, most just aren't doom preppers for the 100 year storm - so when it came, they panicked. I must have gave out hundreds of dollars in Tapcon screws, mason bits, my plywood corrugated steel stash to neighbors in need. Most regular non-trade people don't know how or what will even affix into a cement block. It's forgivable ignorance more than irresponsibility IMO. Anyway, for the most part we all got through it and hopefully learned valuable lessons for about prepping for next time.
Joined
·
17,394 Posts
as a siding installer the nail holding ability of ply wood in the nominal 1/2'' thickness is slightly better in the plywood...I know hit studs etc...
I don't want to call you ignorant, but this statement is. At equal thickness OSB has almost twice the shear as plywood. That's why they make engineered joists out of it. Now it's not without it's shortcomings but in construction a little education can go a long way when it comes to choosing the correct materials. Both in terms of build quality and cost savings.
They both have advantages and disadvantages, one works better than the other in different applications.
As for the video I don't get the line "this is 5/8 plywood, minimum required by code". Then he says "this is 1/2 inch OSB".
I don't get it....there is a code requirement for protecting your windows during a storm? This code allows for 1/2" osb or 5/8" plywood?
Sent from my Nexus 6P using Tapatalk
Yeah,and siding is supposed to be nailed on studs. Now think of the decreased nail holding ability in shingle and flooring applications.
Joined
·
17,394 Posts
not all siding needs to be
Why,because codes represent the bare minimum allowed. And that truly is marginal.
Joined
·
17,394 Posts
so it all goes back to ''who builds for a hundred years?''
Actually not. Buildings don't fail from differences in sheathing, they fail due to foundation movement, rot due to roof maintenance, and sill / lower part of stud rot. There can be other major rot issues due to plumbing leaks or general envelope issues.
I routinely walk a low slope (1:12) roof that used 7/16 OSB and no structural ridge. It's also 20" OC rafters, so it's over spanned. As long as the roof doesn't leak, the roof system will last 100 years.
Because I put steel siding on I rarely worry about studs unless it does not have some kind of sheeting under it. All of mine gets screwed on any more.
21 - 40 of 61 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
