Roof Penetrations In Flat Roof For Lineset/whip - HVAC - DIY Chatroom Home Improvement Forum


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Old 03-09-2012, 11:12 AM   #1
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Roof Penetrations in flat roof for lineset/whip


I am putting two 2-ton heat pump units on a new construction flat roof. The lineset will be 3/4" suction and 3/8" liquid and the whip will be 8 gauge. The roofers are coming soon and requested that I put the penetrations in. I have not decided on a HVAC installer but want to make sure that I leave a viable penetration for whomever I do hire.

My plan was to place a 3" rubber flashing boot and a 3" PVC vertical pipe with a 180-degree elbow (similar to my vent stack penetrations) to keep water out for each unit. My questions are these.

1. Can the lineset and whip be run through a single PVC and then sealed post-HVAC installation with spray foam? Or do I need a separate penetration for each?

2. Should I put in metal flashing vs a rubber version?

Thanks in advance!

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Old 03-09-2012, 02:30 PM   #2
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Roof Penetrations in flat roof for lineset/whip


The method you want to do is fine. As long s you run the lines at the same time.

Which ever flashing your roofers prefer.

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