Is OSB ruined when wet or rained on? Let's find out!
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- Опубликовано: 27 июл 2021
- I set out to see if OSB is really ruined by being rained on. I've heard this forever and I am concerned because I am about to put sheathing on my house during the rainy season in Florida!
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About 5 years ago I put some 3/8" OSB on a gable end of my house to temporarily keep the rain out and is still temporarily there, however I did paint it with latex outdoors paint. It is still as solid as the day we put it up there. Having said that it will probabley fall apart tomorrow.
LOL
😂
It all ready fell apart lol
@@NORMANMORRISON1940 Nope, t is still as solid as the day we put it up.
@@TheFamilyFarmHomestead CORRECT---The only criteria that makes plywood better is wind shear. In all other situations OSB is a better product, unless we are talking pressure treated marine plywood which costs about 4x the price of OSB--and will still delaminate if wet long enough.
Thanks for this one, great info for anyone building with osb
I had a friend building his own place who was almost as concerned with his osb as you are. He stacked up a dozen sheets flat on saw horses, spray painted the edges. Took less than a minute. It protected the edges very well as he had them up on the sidewalls of his house for months uncovered..
Loved that test. My mom has recently had a wheelchair ramp built of OSB since plywood is unreasonably expensive. She is in Mississippi and experiencing rains like you. I think she will find comfort with the results you've demonstrated. I've shared a link to your video. Don't be surprised if you get another follower... and don't talk bad about me after this point!
Interesting test and results. Gives you the peace of mind to move forward.
I have used it for exterior siding with no covering. It lasted for many years in the Midwest.
I have had several sheets of OSB unprotected outside in Wisconsin for 2 years now, and it all still looks great
Thanks for the test. I was absolutely convinced that the OSB would come apart. Keep up the good work Andrew. You amaze me with all you do.
Thank you for watching
Thanks for doing the OSB test, I'm like yourself and I'm sure others that OSB would not hold up after getting wet once much less multiple times.
thanks for showing. I'm using OSB boards in the garage and I'm a little nervous because it's a rainy week. I protected it with foil, but the water finds its way.
Sheath sections at a time, wrap it as you go. You and the OSB will be fine. The old style particle board would come apart if you looked at it wrong but todays OSB is constructed totally different.
Great test, really set my mind at ease about my damp workshop roof construction whilst waiting for the rain to go.
We had 30 days of nothing but rain yesterday the edges will swell if you put an cheep exterior grade of paint or even put some Thompsons water seal or similar that will help to some degree but if you can get a commodemey synthetic roof ers tar paper That will help better ya just gotta lay something on top of it so the wid doesn't blow it off & use the zipper & tape now that will really help!!
Seen a condo built over here on west coast of Florida that got into some trouble after they had the whole building covered with OSB it was about a year and a half before they got everything straightened out.
They had to take it all off and redo the whole building no so much because of falling apart of the OSB
It was the black mold that was growing.
It was a 3 story 12 unit building.
Thanks for the great content are Florida neighbor.
OSB retains moisture like crazy. It can look dry and still be soaked on the inside. So what happens when it gets wet and then sheeted the next day? All that moisture is stuck and its mold city. Have a small leak in your roof or siding? Mold city. So it being a terrible building material is not so much that it won't hold up (although OSB is only about 50% of the strength of ply) its that unless you are in the desert it WILL mold.
I had to use 4 ply regular plywood to cover the bottom of my fence so my chihuahuas don't climb under and get out. So I used redwood fence stain on the wood. covered all sides and I'm impressed how long it's lasting in full weather for years and up here in NY that weather includes 6 months of SNOW and more SNOW.
So I would just seal the edges and go for it
I have the same problem here in the UK, also is my first ever timber work, having been a mechanical engineer forever. I am covering the roof sheets with polythene but we also have high winds so occasionally some of the OSB could be exposed. Not worried about the structural timber as I have treated it all first with hydraulic fluid with my own die then with inexpensive floor clear varnish. Thanks for sharing your experience which helps a lot of us 🙏
Might be worried about standing water on a floor for prolonged periods but the walls will shed water. Just pick up a can of quality exterior sealer so you can treat any cut edges for some peace of mind.
i got 2 pieces for my garage doors exposed for 20yrs and they are still there, lost it's color of course but still solid. also the edges will be protected by the next piece, so you will be ok. great videos man loving them.
My experience with bare osb in the weather is as long as it can dry fairly quickly it will last a week or so before it starts to fall apart. But it also depends upon how thick the osb is too.
Andrew, I mean to paint the whole stack of OSB at once with either a roller or brush & the cut sheets as once you cut 6 or 8 sheets & paint them in a stack. It's an thought if the edge is the only problem you have with moisture, do a wall till the rain gets you or if finished, wrap early next morning after it has dried over night.
take down the plastic you have up now just enough do one run ground to roof or whatever you think you can get done in a day....then tack that back up and move on to the next run...inspector can see through it to inspect the nail pattern and you are covered.
Sounds like a great plan!
yes even though I don't see the Zip system in my area much due to the cost and the cost of the tape is still a very good product as your one and done sheathing house wrap dried in👌
I agree
I built a deer stand out of OSB years ago, and never painted it. It stayed solid for the 4 years I lived in that area and used it. I think you'd be good thru a couple rains as long as it's good and dry before put the wrap on, but what do I know... I'm a computer jockey, not a builder.
Thanks for the education!
Thank you for watching
Being in construction in NY. we have had OSB go through fall, moderate winter with a few snow storms and finally sided in spring.
No issues on exterior sheathing. It holds up really well. Don't worry about it. Just moisture wrap when dry to avoid mold. Just an FYI. Don't think you would though.
Thank you for the information
It will be fine. I have a friend who has a shed made from OSB walls. It’s ugly but still standing 10+ years later.
Did same.Painted outside with three costs of exterior fence treatment and do again most years,and there has been some surface flakes that lifted,but it's solid after six years.
After a couple of pop up showers here in Michigan, and more on the way, I was beginning to be concerned about the structural capabilities before getting the roofing completed. After watching your video, it gave me some piece of mind before finishing the job in the next couple of days, thank you! 👍
Houses under construction get rained in all the time. You will be OK, just let it dry before closing it up.
Wow I always heard it would come apart. I’m impressed
Me too
Cool and surprising test results, looks like your good to go to the sheeting!
I think so
I would be curious to see what a test square that has had the edges sealed tested next to the test squares without sealant to see if sealing the edges would be of value or not.
Andrew try the flex seal and coat your edges before you put them up we've done that and it seems to work as long as the edges are coated...JMO
Thanks for this test. I'll be redoing the exterior of a 2nd home we own soon and as we live in the Northeast ZIP system is NOT an option as we want our vapor barrier on the inside, NOT the outside. For ya'll down South it's the exact opposite so I would recommend ZIP system. I'll be doing OSB with Tyvek here so it can breathe.
That's some good testing 👍🏽 I really thought the OSB board wasn't going to hold up after it getting wet but I was wrong
Me either
Feeling your pain with all this rain over here in Destin. Seems like it’s been raining forever and no sign of stopping in the immediate future. Glad you’re gonna start sheathing though and that the OSB should hold up for you bro! Stay hydrated… days are getting brutal and August is gonna be a scorcher.
It's been unbelievably hot, today was miserable
I’ve had a temporary raw osb door on a shed. Still holding up 3 years later. I’d say do your more 2 exposed sides done first and should be fine
Great test!
Great video of good tests. Thank you!
Thank you for watching
Our house was wet constantly during our build in Mar 2005.OSB was fine just put sheeting and tape on it.
Thank you for the information
What great information.
I was about to say just watch it won't rain lol but thankfully it did an awesome experiment
OSB - Formaldehyde and VOC- the off gas concern. Not to mention, when you get a leak. The glue eventually gives away.
Not to mention the polystyrene insulation is well made of petroleum and has a higher flammability potential then others
If you plan on sheeting all sides first instead of sheeting, house wrap and siding one side at a time I would probably sheeting.plastic until your ready for siding then remove plastic and add house wrap and siding. Extra cost on plastic but may hold up better then house wrap over a long Peoria of time.
My father built 2 sheds in his small backyard when he retired that were 7x7 each. One was a tool storage and the other was a mini workshop. He used OSB on the outsides. It lasted for almost 10 years, but mostly because it was painted every couple of years. The only place that went bad was about the bottom 2 feet or so, that almost completely rotted off.
He said his big regret was not covering it in something like liquid tar or a thick sealant, then painted over it. Or tyvek then paneling or siding. But everything was always on a retired man's budget.
I can send you pictures if you would like.
This material for sure needs to be covered by vapor barrier and siding to last. Take care
I am currently building a house In Northern New Jersey. I used the same OSB Sheathing and we get more inclement weather especially during winter months. I had every seam sealed with Zip Tape and rolled every seam with a hard nylon roller. This worked amazingly well and also helps keep the house airtight as well as water tight. Give it a shot let me know what you think. Good Job and Good Luck!
I've already bought a case of zip tape and the roller. We think alike!
Great job and informative!
I enjoy your test and review videos
Thank you
Good test. It would have been good to have a piece which had been treated with Thompson's water seal, to see how it faired. You can get 5 gallons for pretty reasonable price, and it might give a little peace of mind on the sides of your house that aren't protected somewhat by porches. Could just spray it on each sheet as you nail it up, with a simple garden sprayer, but it probably is overkill. Spraying just one side might cause the sheet to warp though. Seems like there's always a problem with whatever I try to do. Many times I overcomplicate my life. Lol.
Worth testing in the future
The previous owner of my Fl property built a 20x50 cabinet shop and sheathed it with 7/16 OSB. I have no idea when it was built but I've lived on the property for about 8 years or so. All he did was paint it and it's still holding up great. There is some damage not even as bad as your results. The only other line of defense he did was the fact that he overlapped the sheets like shingles. Not an ideal way to build a shop but it worked for him and its working for me now as I have recently converted it into a mechanic/fabrication shop for my projects.
Good to know
Omg thank you so much for this video, 100% what i was looking for. Thank you thank you thank you
Someone just hit my mailbox and knocked it off. Had to rebuild it. It was new about 5 years ago. I heavily painted a piece of OSB for a mount up under the bottom of the box lip. It had all crumbled into mushy pieces. Replaced it with a thick board and some pieces from my composite decking this time. That is my experience with painted OSB covered by a metal mail box.
I definitely wouldn't use it for an application that exposed, it's interior grade wood with a short outdoor exposure rating.
On my current house build instead of OSB they used a product Dry Line ...I live in Tornado Alley North central Texas..I was told it will not mold and mildew....
Edges are definitely a weak spot. Maybe seal the edges with some sort of water resistant sealer/some cheap oil based paint. Peace of mind not having to worry about it goes a long way
That's an idea
I had some osb cut offs on the ground and covered with plastic for 10 yrs .The bottom just started to rot and the middle pieces were still good.
What you can do is put up the osb sheets and cover with wrap as you go it's more work but you know that it will hold up
Have to have inspections and pass before wrap can happen. That puts a wrench in the mix.
Use some old paint you may have sitting around and seal it, spray on and back roll, quick and easy.
Hello, I liked your OSB test, If you are interested I would be interested in you weighing them from the start to see how many days or rains to where you can see the weight starts to change do to it starting to absorb water. thanks keep up the good work
I'll add that to my next test
A pleasure to watch, well done, very useful as I have some under the rain just now and I'm worried... thank you (under the water you still looking good too, ahaha :) )
I look at your testing would be relevant to people that have a house in flooded water but good way to test the wood for your house
Here is some actual real time data about our OSB wall exposure when we built our house in 2011. #1. Total Number of days to complete OSB sheath/dry in the external walls. (OSB not protected with anything) 11 days. #2. Next day Day 12 all OSB external wall sheathing spray painted with a gray paint like material ( sorry I don't know if it just paint or some type of waterproofing spray) Exposed OSB protected only by gray paint material for about 1 month as the external brick work completed. In my area at that time "house wrap" was not code but all the builder's sprayed that gray paint material on the external wall OSB when the house was completely dried in. None of the external wall OSB in my house after gray material treatment showed any type water damage. Hope this information helps with your OSB concerns.
I've done my own test with OSB,Plywood, and solid wood. Surprisingly, the OSB did better than plywood. Naturally, the solid wood faired a lot better, but the cost to sheath a home with solid wood would be cost prohibited! I've never been a proponent of OSB, but I can't argue with the results.
OSB can take some rain but it will swell and deteriorate with prolonged exposure. We had OSB in the floors of our older home and when we got a water leak under a sink cabinet in the kitchen it cause the OSB subfloor to deteriorate such that we had to replace the entire kitchen and dining room floors. Same for our main bathroom. Renters never told us of any problems and we ended up spending thousands to replace floors and framing for three entire rooms.
Any wood can't take a steady leak like that, water damage is no joke. Hate to hear that for you.
Good osb test.
Thank you for watching
I know it's really expensive but the zip system sheathing is designed for situations like your build with house wrap built on it and ends up as a much better system
I couldn't find it anywhere when I bought my Osb.
As a uk resident it’s difficult to comment on OSB in America but in the uk we produce different quality levels of OSB
depending on what you are going to use it fit. OSB 3 sterling board is completely water resistant and is often used
for construction site security fencing and left out for years. It’s designed for building construction and therefor is
structural timber board. I’ve used it a great deal for sheathing and left it over winter with no problems at all.
For what it's worth, it really depends on the orientation, vertical to flat. When water can run off quickly ( vertical) , it can do fine without much damage. The flatter it is the more damage and de-lamination will occur. I personally only trust plywood, and the Zip System, when installed correctly, but only my opinion. Good luck on your decision. 👍
I’m waiting on my metal roof to be installed in our home. We have plywood on the roof and this tropical storm is coming into florida! Should I worry about the roof getting more rain on?
No as long as you allow adequate drying after the rain event. Never cover wet material, always allow drying. These types of sheathing are rated for "some" weather exposure.
Hey Bud, I am in central Florida, when we built our shed about 7 years ago, I had the OSB outside exposed for 4 days before I could get it covered and it appeared fine, but something that happened was when I finally wrapped it and installed the siding on it, the OSB shrunk over time as it dried out and it left large gaps between the sheets of OSB compared to when it was tight together on install. So from the inside, I was left with large gaps visible to the siding. Something else that occurred in a few pieces of the vinyl siding we installed wrinkled from the shrinking of the OSB as it dried as well a few areas the siding cracked at the nail areas. When we built my parents shed, instead of wrapping it right away, we used zip tape on all the seams, and just that alone helped a ton on it expanding and swelling it seemed. To this day the gaps on those sheets are super tight together. Lastly, not sure if this would help you out, but I needed to paint our hunting shack on our hunting property up in deland, fl. I learned that if you call your county and ask where to recycle old paint, you can drop in and talk to them and get free paint from them after you sign a waiver that you will dispose of it properly if not used. They combine like colors in bulk 5 gallon buckets and after a few trips, I gather over 100 gallons of free paint, which I mixed in a large 55 gallon drum I had laying around and tinted it myself and painted the hunting building. If you need to, this could be a cheap way to cover the sheeting until your ready to put siding up.
I'm actually zip taping all seams myself. Plywood and osb definitely expand and contract.
Plywood does delaminate more than osb. It's why most roofs are sheathed with osb now.
I've seen it perform worse myself
Exposure 1 should get you through 10 wet/dry cycles but not on cut edges. The main thing when sheathing a building is maintaining 1/8” panel spacing ALL edges.
I'm pre setting all gaps
OSB is not a friend of the weather. The swelling will depend on the time you will have it exposed. Rain/Sun Rain/Sun for prolong periods will result in OSB breakdown. Homes are usually wrapped in Tyvek once OSB is installed to protect from weather since OSB loses its strength and shape if it's exposed. Shape impact - the roof and walls will warp with waves and OSB that has been exposed for a month in the weather ended up losing its strength and was able to punch a hole through it.
Good information Andrew. I also thought it would swell up and come apart after very little exposure. Appreciate you taking the time and sharing! And hey you remembered to say like and subscribe! Lol
Yeah finally! 😁 Thanks for watching
My shed has7/16 osb two years now with 1’ overhang it still holding up good, soon as house is finish it gets log siding, rain much also so it’s been wet countless times, I did spray borat on it about 6 month mark though
Since you have a stack of OSB I would suggest painting the edges before moving off the stack.
They are already factory painted but it doesn't seem to be helping
Go with the zip system man you wont regret it it also adds to the air tightness of home thrfore lower your energy bill
I tried two different states and stores several hours away a few months ago and couldn't locate any zip. I've already bought my Osb so it needs to be used.
In 1976 I worked at a store that sold waferboard. We called it Blandex. A guy came in was buying some and he said guess what I’m gonna use this for he had one of those Volkswagen Things and he said he was going to make a roof for it. Lol I wish I would’ve seen how it turned out but I didn’t.
Question for you ?? If you wrap the outside walls that aren’t in the direct rain better to do first and then if you put that plastic up again won’t that help to keep it dry until the next step? That was a great test I’m sure it’s going to help others. We had sprinkles yesterday morning and early afternoon:) not enough to measure but it gave our fire fighters some help with these fires and it wasn’t as hot (88) we have been in the high 90’s for over a month. Stay safe:)
I'm going to try to start under the porch and move to the outside that's exposed. I was concerned about showers that catch me before I can put up any protection.
It's water resistant,not water proof.I use it for sheds,and it's lasted well,coated with fence treatment.
Andrew you are unfortunately fighting rain and tropical storm season approaching. How long to do one side completely, sheathing and cover? May be the best option to get both sides done, if possible first. Good luck🙏.
Not sure, find out soon enough
This would be worse for plywood, and even much worse for particle board. I have seen particle board used in homes, so go figure.
You know, I don't have desires to build a house so some of the videos I don't fully watch but tests like this and the plywood test upcoming have practical application beyond housebuilders. Plus I like your methodology. I'll never build a house but I could possibly build a closet or another box and it would be nice to know how the weather handles it.
Point taken, this channel is about a lot more than building a house. Many more practical application tests coming.
@@TKCL Don't get me wrong, I'm hooked.. just because I don't have a desire to build a house doesn't mean that I won't actually do it someday because I'm watching this channel lol.
O have built houses in MT and have had that osb sit all winter on houses because early snow and not able to access the house and not have any issues as long as above the eves so moister doesn't sit on ebges
Thank you for the information
It was hard to tell but which side did you left facing out? You do know that the smooth side faces in against the studs when installed. You cover with wrap and seal with vinyl, concrete board or what ever you choose. The other side against studs doesn't get covered and has to deal with condensation from temp changes. Guess it wouldn't matter much structurally it's the same either way.
I talk about that in an upcoming episode. I install smooth side out since supposedly it's more weather resistant. Straight from the manufacturers website it's says the only reason a rough side exists is for slip/fall protection on roofs and flooring. Structurally it makes zero difference which side is installed out or in.
Andrew, how about run one piece of tin on that corner going out to the grass to help with the washing out.
It's on my to do list
OSB is ok for walls. But I never use it for floors or roofing, do to water damage. Another thing I don’t like is it’s extremely flammable. In our area duplexes are required to have 8’ wide runs of plywood from eve to ridge on the roof above the dividing wall, to slow down the spread of fire.
Ever watch Pure Life home build? It’s been exposed for a couple years! 😂 A coworker put a piece of LP siding in water for over a year and it didn’t swell! They must use a waterproof adhesive?
That too is why people have been switching to Zip System OSB. It is almost rain/water proof. I imagine it is quite more expensive.
Couldn't find it in two states a while back, so I bought osb.
What Paul Drake said. Put up OSB- cover with plastic.
Started a small project and and a little rain got on a piece over night. The painted edge, not the cut edge, had swollen.
Let it dry and you should be ok
@@TKCL I did, but still had to repair the small section.
good info
My Wives Tail, as u called it- n our Money Pit house, the builders used particle board as the sub-floor n the hall bathroom. We had an undetected slow water leak under the sink. I found it when I almost tripped and fell on a floor seam due to the swollen particle board. We had to gut the whole bathroom. One simple test u didn’t do was compare the wet board’s density after it dried to new never wet board. U r trusting your eyes that there is no swelling which will pop out or loosen those nails. But then, my Money Pit was very old and so was that particle board so I’m sure the quality has improved drastically.
Particle board hates water, osb is a different construction.
@@TKCL Well now!! As they say here, I done learnt something!! It looks exactly the same! Now I’m off to do some research and understand the difference? Ty for taking the time to teaching me something new, yet again!
It depends on the glue
Wrap it as you go
spray it with thompsons water seal until you can cover it up with wrap
Osb 5/8 is dam tough … I have it in my second floor , it’s still taking frost underneath in places … it’s been 2 or three years ,,,, rain and dry out , rain and dry out ….I have my roof on so it’s not getting that much moisture …. It swole up in thickness , but I feel the glue in this preserves the chips …. I’ll put a mdf over this when I do my finished floor ….
Paint it top bottom and on the Sides and it'll last better then plywood
I'm not in the construction trade, but do a lot of research on building... I've never heard much concern about OSB swelling with some rain exposure... I've heard a lot of bad about particle board vs. water. Heck... seems like the entire construction industry uses OSB on the roof/siding underlayment... I don't think you have anything to worry about Andrew. Just work fast... and get the Tyvek on!!! :-)
Same. I am currently building a 12 x 12 shed. I have had my walls up for about 2+ weeks and sheathed. We have had a few rains here in NW Ohio. They're still not covered and I do not have a roof on yet (trusses are on order). I liquid flashed my bottom plate area today and will work on the cutouts for my doors and windows tomorrow and house wrap right after that. With the moisture and rain that we have had I do not see any buckling or peeling or delaminating of any of the OSB (7/16) that I have. Now, if it were dead of summer, high humidity, lots of rain on top, then that may be an issue.
Absolutely a great video, with the unbelievable cost of building and airbrushing art on my cornhole gameboards and with increase in wood I can no longer pay the price for ACX board or plywood and make my profit for my time and construction, I have always wondered the option of using OSB board for the game tops, I have through the years I used OSB for about 7-8 or sets, they were never an issue or returned, I always give the customer disclaimer that they should never let the boards become soaked or left out in a weather situation over a period of time no matter what the tops are constructed with, I'm not concerned about the 2x4 framing as well with the tops I seal those with polyacrylic clearcoat., after viewing your well done torture Test, it has put my mind to rest and do believe OSB boards will be my option for my tops ,I did invest in some wood sealer on the OSB board to enhance the possibility of no water damage, especially on the cut edges. I truly appreciate you and the time of paying the learning process forward to so many, I would appreciate any input on my process and would like to send you a pic of the latest set I did using OSB board. Our you on Facebook or some other way for us to connect., once again Thank You
The only thing about osb is its textured and rough. Won't that affect the corn hole game?
@@TKCL Thanks for the response and video, not really, the clearcoat plus the breakdown of the corn in the bag creates the dust I make my own bags and never use nothing but whole kernel corn, I have done maybe a dozen sets through the years with OSB boards ,a few years back had a friend with a bunch of OSB boards He was throwing away so I thought Why not !, a lot of guys put way too much into building the gameboards and expect people to pay a high price, I make $99 per set and I'm good with that, my boards are regulation size and for recreational and backyard play the most import thing in construction is the correct height on the boards. I was thankful to see your video on the torture test, I'm assured now that the OSB will withstand the elements as long as a little effort is taken to keep them from a soaking of any kind, I will continue to seal the edges and whole OSB board with a water repellent sealer, the downside is even the OSB board is soaring in cost now unbelievable Can you recommend a good wood sealer for the OSB boards? and once again appreciate the input. Thanks
I can't recommend a good sealer, I've just always thought it was good practice to keep all wood out of the elements.
I wonder if the heat from the saw spreads the glue around the cut edge protecting it somewhat. Probably not, but it is odd that the painted edge is the worst, though the paint may be for identification rather than protection.
That's a good thought
My brother worked for a osb place out of Wisconsin. Water is bad for it and it will delaminate quickly. Also I you had asked about time limit on the product. When it's done and out the door, it's done. OSB only waits until it is ordered then shipped. There is no waiting time after it's produced. Water is your enemy.....God Bless
Thank you for the information, God bless
Andrew, just a thought, couldn't you sheath behind the plastic you have up now? It's not a 'waterproof' solution, but it might buy you enough time to get the inspector over to check the nailing pattern before you wrap that section in Tyvek?
I'll have to take it all down and reinstall it. Literally takes a few hours, it's a backup option
i wonder what would happen if you cover it in tyvek and it doesnt get to dry first will the tyvek keep the moisture in and rot it
I'm not sure, I definitely want it dry before wrapping.
Its more expensive but it will not deteriorate like other OSB. But I would use LP Smartsiding
It's been difficult finding materials
The wood don't show the damage till about 6 months after its gets wet it falls apart after the glue gets wet and brakes down so after about 6 months to a year you will see the affect I only used it on the walls where there had to be 2 layers of wood press Bourd then siding on my roof only fir plywood the best