How To Seal Heat Pump Refrigeration Lines Going Through Foundation Wall
Hi!
I have a minisplit heat pump. The refrigeration lines to the air handler units penetrate our foundation wall, which is concrete block. This morning we discovered that rainwater is leaking into the basement, apparently because the various hoses are not sealed in very well. What is the best way to seal them in?
I have read that hydraulic cement or expanding spray foam might work.
What is the best solution? I will need to apply this in the rain.
Thanks
Bob Cochran
Replies
Are you saying that the lines are entering the basement below the level of the ground outside?
HVAC Hoses Are Above Ground
Hi Dan,
The HVAC hoses go through the concrete block foundation, but they are above ground and visible. That means they are exposed to weather, too, like rain.
I just wonder about the best way to seal them where they penetrate the concrete block. Something like spray foam? Hydraulic cement? A putty of some sort?
I can supply a picture if you want.
Thanks much
Bob
A picture might help, but it's a common problem. Spray foam isn't always a good idea because it tends to cause the foam pipe insulation to deteriorate. I've found electrician's putty to be a fair substitute since it's compounded to not attack plastics. But there are a lot of different scenarios.
HVAC contractors usually use spray foam here. They should have made a drip loop in the line set tho, so rain water would flow away from the penetration.
Thank You Very Much!
Sorry for getting back to you so late. I want to thank all of you for your help. Our HVAC company sent someone over, and sealed up the opening with a putty-like material. The basement is dry now.
Thanks again for your kind help and advice.
Bob