I was shutting down my swamp cooler for the season and notice that the sealant around the wires going down into the roof has opened up. I assume it would be a good thing to seal this to keep rain and snow out. What is my best bet to solve this?
Wiring – How to seal swamp cooler wires going into roof
exteriorhvacwiring
Related Solutions
I'm going to bet you need kick-out (rain diverter) flashing to divert the water off the roof and into the gutter at the point where the roof/wall intersection ends. It is probably the most left-out piece of flashing and causes lots of problems.
-kick-out flashing
However, there is no way to tell where the leak is coming from without a thorough inspection of the area. First step would be to check the roof/wall intersection above for proper flashing.
Stick closed-cell backer rod into the larger gaps. Then caulk over everything (small gaps as well as the backer rod) with a good exterior-grade caulk that looks good color-wise when connecting them.
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Best Answer
The best way would be a total do-over. Penetrate the roof with conduit rather than liquidtight and use two boots for two pipes. The conduit is optional - the boot will work better cinched to a conduit that doesn't flex or move than it will with liquidtight. But using two boots really isn't optional.
If I really had to try to make it work as is I'd try filling the boot with expanding foam.
I'd remove as much of the debris as possible, and keep the two liquidtights at least a half inch apart. Then I'd fill the boot a couple inches at a time, letting the foam set up each time. I'd use the low-expansion type foam made for doors and windows. I'd top it off with some roofing adhesive for UV protection.
But I'd only do that in a pinch, and I wouldn't be surprised if it leaked, you should do it the right way, use two boots.