Leaking roof

[threeputt]

I install a roof on a small building that I keep my air compressor in two months ago. It is right up to my metal building with PBR panels.

I use the same panels for the roof, well almost the same. I used metal cutters and cut the roof to fit as close I could get to the PBR panels .

I then used Cofair QR625 Quick Roof Pro Aluminum 6" x 25' to try and fill in the small gaps. I even took a heat gun as to help it seal. I thought I had it but last night it leaked again.

What could I use to seal this thing from rain water running down where I cut roof to fit ? even though it looks sealed and was until last night. Water has a way of finding the holes but I can't. Maybe Flex Seal would work ? on top of the Cofair QR625 Quick Roof Pro Aluminum tape ?

I keep other things stored in this building other than air compressor and I want to keep things dry.

 

[readhead]

It will probably never seal. The expansion and contraction of the two metal surfaces will break the seal. The proper way is to cut the siding on the wall and slip a flashing under the wall and over the roof.

 

[matt_i]

Readhead has your only answer imo.

I was just going to add that your flashings above should pour into a kickout at the lower ends, otherwise there's the potential for stormwater to run down behind your wall panels. This is one of the most skipped/missed weatherproofing details imo.

PBZ kickout flashings are aluminum but have a nice baked finish on them and come in many colors. Can trim to size.

 

[Bretny]

You need the proper flashing. Sealing it with goop is a temporary fix.

 

[NUTTSGT]

It will probably never seal. The expansion and contraction of the two metal surfaces will break the seal. The proper way is to cut the siding on the wall and slip a flashing under the wall and over the roof.

I'd agree as well.

You may want to go to Youtube and check out some of the videos from RR Buildings. Kyle has shown a few times how to flash windows, which cut in to the siding, you may get an idea of what to do from those.

 

[bob15]

You could try using Eternabond tape and caulk. This is the stuff you use on RV trailer roofs. Very sticky, has UV protection and has worked well for my snowmobile trailer.

http://www.eternabond.com/RV-Leak-Repair-Products-s/22.htm

Ideally though, you want the compressor roof to be under the building wall so you aren't relying on any form of tape or caulk for sealing purposes.

Can you cut out the wall and move the roof panels up and under the wall?

 

[threeputt]

You could try using Eternabond tape and caulk. This is the stuff you use on RV trailer roofs. Very sticky, has UV protection and has worked well for my snowmobile trailer.

http://www.eternabond.com/RV-Leak-Repair-Products-s/22.htm

Ideally though, you want the compressor roof to be under the building wall so you aren't relying on any form of tape or caulk for sealing purposes.

Can you cut out the wall and move the roof panels up and under the wall?

I cannot cut the wall. I will just have to patch it the best I can. This compressor has been in this building for almost 60 years but now since I did replace the roof it don't leak straight down.
No big deal as there is not much room in this small building anyway. I just thought there would be something I could put where the roof meets the shop panel that would stop the small leaks.
I will just try Flex Seal. Flex Seal is liquid rubber in a can. This means that when you spray it onto a surface, it will make it waterproof, but also remain flexible, like rubber.

 

[oldmxracer]

I do not understand why You cannot cut the wall and flash the addition ?

JUST ASKING ?

 

[The Cobbler]

anything less than proper flashing will be prone to leaks .
I'm also curious why you cant cut the siding

 

[SALIV8]

If u dont want to flash it use dow 795. Check the specs first as ive never used it for metal but that stuff is amazing. Will last forever out in the open. And its rated to like 50% expansion/contraction by the caulk manufacturers institute.

 

[Danno1]

.



3M 5200 or Sikaflex



.

 

[jkeyser14]

If you don't cut and install flashing it will NEVER seal. You will get water running down and into room between the overlapping flanges on the metal siding since the siding panels aren't sealed to each other.

 

[threeputt]

Thanks for all the tips.
I just don't want to cut into my building for this old air compressor shed. Its been this way for almost 60 years and no harm done to compressor.

There is also galvanized rigid steel conduit running from under slab with electrical wires in them. They are bolted to panel right where it would need cutting for the flashing . Two of them. Not even going to mess with that . Plus I just don't to be cutting into my building. These panels are 24 gauge and after all these years still perfect.

The compressor building is not in good shape anyway but for now it serves my purpose. The panels I installed sealed it up where I mainly wanted it to. Old metal panel top had a hole rusted into it from installing it wrong in 1961. I installed the new panels right where it wouldn't hold water .
I will just put some sealer on the back part. If it don't work its no big deal. I can always tear the old shed down and move compressor inside if I have to.

 

[Bretny]

Next time run a peaked roof perpendicular to the wall. Less chance of leaks right off the bat. You should be able to find something like an end wall flashing for that situation and not have to cut the building.

 

[threeputt]

Next time run a peaked roof perpendicular to the wall. Less chance of leaks right off the bat. You should be able to find something like an end wall flashing for that situation and not have to cut the building.

Thanks . For now I got it stopped from leaking by using the QR625 Quick Roof Pro , then sprayed Flex Seal on top of that. Rained three inches last night and just checked it and it is finally dry in that building.
Do you have a suggestion on end wall flashing for my panels ? in case my fix don't last. Like I mentioned I am not going to cut into my building . Again thanks for all the tips

 

[mike93lx]

Some pictures would really help

 

[Bretny]

Call the panel manufacture to see if they sell a flashing that will do what you need. End wall flashing may do what you need.

Usually the sun/weather attacks any spray/roll on sealants and they never last as long as proper flashing.

 

[rburke65]

So you could cut the siding....you don’t want to cut the siding.... got ya now.