Welcome to Q&A for Home Maintenance Q&A section, where you can ask questions and get answers from me and other members of the community.

Spam, self-promotion, questions with abusive, inappropriate language, and irrelevant questions will be deleted.
All of the questions are moderated!

You'll be notified when your question is answered. Please reply with Feedback to share whether a solution worked or didn't work. Thank you!

Connect on Google+
Find on Google+ Local

What is the best way to fill in the gaps around the AC refrigerant lines

0 votes
From David:

Where the A/C lines run into my house there are gobs of old insulation coming out that needs replaced. What is the best way to fill in the gaps around the lines and the siding of my house?
asked in Cooling System by darekrudy (21,730 points)
Share this question on your favorite network.

1 Answer

0 votes

Hi David,
The best seal around air conditioning lines penetrating siding / wall would be provided by a spray expansion foam. You can get this product in any local hardware (check this site – http://greatstuff.dow.com – this is one of the popular brands). There are high medium and low expansion types (it’s described on the container label).

The high expansion foam might cause some wall / siding deformation. Maybe medium-low would be best for this project. Before you spray the foam into the gap around AC lines remove all the debris and old insulation, slide new pipe insulation onto the thicker AC line, and if possible into the wall (you can also get this foam sleeve insulation in the hardware store in a form of a black or gray soft pipe – solid or sliced along its length for easy installation).

After the expansion foam dries out completely it can be trimmed with a knife and painted to match the wall color.

answered by darekrudy (21,730 points)