I think I really messed up! I could use some help because this problem is driving me crazy. In the summer months my greenhouse was my oasis but now that the rainy season is here it's unusable with all the water getting in. The back of my garage had a low overhang the people before me used the space underneath for a dog run. I got the idea to remove the shingles and roofing up to the side of the building and replace it with SunTuf polycarbonate clear panels and make a greenhouse. The consistent rain is here and water is making it's way under the panels and dripping all along the back of my greenhouse. I bought some 8 inch aluminum sheeting and tucked one side under the shingles and it hangs over the plastic panela about 4 inches. Used some caulking at the shingle edge and put some rubber patch tape along the seam as well. It helped not at all. I don't know what to do. Water seems to pool at the little edge created where the two roofs meet. My neighbor said he would have put the panels under the roof supports but that would have made the space much shorter. I'm trying to avoid moving the panels and doing that at all costs. Any ideas for how to fix this without going that route are much appreciated. Having that greenhouse to spend time in during the long winter was going to be what got me through this winter now I just have a wet mess on my hands!
Lean-to style greenhouse roof leaking where it meets the building roof
- Thread starter Nikki V
- Start date
Help Support House Repair Talk:
Normally with any sloped roofing product each piece is overlapped with the upper piece going on top of the lower piece just like how shingles are laid. The amount of overlap and even if overlap will work depends on the slope angle. Water will wick up hill if the slope is too little the reason say shingles would not be recommended on a 2/12 pitched roof.
Sounds like you have the lap backwards or a sealing issue.
Maybe a photo from outside would help.
Sounds like you have the lap backwards or a sealing issue.
Maybe a photo from outside would help.
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Here's a pic from outside. In an effort to get the roof above the panels I tried to bridge it with this aluminum sheeting. I haven't secured the ends yet Incase I need to remove it so that's where there's aluminum hanging off. The aluminum is tucked under shingles and sealed so I thought it would do the trick but didn't seem to make a bit of difference.
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With that much space my guess is with a wind driven rain it is forcing it uphill.
One method to try and see what is going on is to take a garden hose and a spray nozzle and shoot water on the shingled area and watch what it does. It will give you the ability to see whats going on rather than having to go out in a rain storm. It also lets you do a small area at a time to see if the problem is just in one spot.
One method to try and see what is going on is to take a garden hose and a spray nozzle and shoot water on the shingled area and watch what it does. It will give you the ability to see whats going on rather than having to go out in a rain storm. It also lets you do a small area at a time to see if the problem is just in one spot.
A lot of those corrugated panels have what they call closure strips. They are usually foam strips that are the same profile as the panel. They are really meant to seal out air at the top or bottom of vertical panels but might work for what you're doing. Probably would not be a perfect seal but might be manageable especially if it's is a wind driven issue. Check where you got the panels and see if they have something like that.
