air-conditioningflashinghvacsiding
Our contractor installed an AC compressor and did a poor job of it.
He ran the AC coolant lines through the middle of the wall and then just squirted some expanding foam into the hole, like so:
(Click images for larger views.)
What is the correct way to flash and/or seal this opening?
Around here, the way its usually done on T1-11 sided houses is to pass the lines underneath, in the crawl space and through a vent, like so:
But I guess that's not an option in this case?
I like clear silicone caulk for this kind of job.
It will remain flexible after curing, so if the pipe gets bumped or moved around it won't break or crack like expanding foam. And the clear caulk won't stand out since it cures to a translucent light grey color which is similar to the siding.
Rather than trying to cut holes and add vents, you could also replace these with vented soffit skirting. E.g. This one can be picked up from your local HI store:
Best Answer
There are all kinds of options, but the cleanest are probably purpose made flashings specifically for AC lines, like these ones:
Note that it is very important to tie a flashing like this into the overall water-resistive barrier to the house, similar to a flanged window.
The "vent" entrance method would only work on a raised foundation structure, the home in your picture appears to be built on a concrete slab.