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Old 10-26-2015, 03:36 PM   #1
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Should I caulk roof around air conditioner?

Hello!

I have a 2013 30.5 BHLT with the Coleman-Mach roof-mounted air conditioner. I am resealing all of the various items on the roof (skylights, antennas, fan hatches, ladder mounts, etc). I'm wondering if I need to lay down a bead of sealant/caulk around the roof where it meets the metal bottom mounting plate of the air conditioner.

There seems to be a insulating pad of some type between the air conditioner and the roof, but I'm wondering if I should beef that up a bit with sealant.

It's not leaking now, I want to keep it that way.

By the way, I'm using Dicor Ultra Sealant (with the special primer), and it seems to be working well on my TPO roof.

I hope this question hasn't already been asked and answered.

Many thanks for your thoughts.

Robert
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Old 10-26-2015, 03:52 PM   #2
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No you do not caulk around the a/c. It uses a thick rubber gasket. You do need to check from the inside that your bolts are tight though. Theres a thread about the bolts loosening up. Mine where actually loose.
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Old 10-26-2015, 04:08 PM   #3
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If it ever starts to leak you buy a new gasket. As lx22f/c said, you never caulk the a/c.
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Old 10-26-2015, 04:23 PM   #4
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if it ever starts to leak you buy a new gasket. As lx22f/c said, you never caulk the a/c.
x2, no caulk!
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Old 10-26-2015, 04:26 PM   #5
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Read the thread on the a/c gasket before cranking it down to tight!
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Old 10-26-2015, 06:09 PM   #6
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Thank you all for your comments.
I will not caulk the air conditioner.
I also checked the air conditioner mounting bolts and they were OK.

Thanks again,
Robert
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Old 10-26-2015, 11:44 PM   #7
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Thank you all for your comments.
I will not caulk the air conditioner.
I also checked the air conditioner mounting bolts and they were OK.

Thanks again,
Robert
Check them once a year Robert they have a habit of loosening up..
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Old 10-28-2015, 06:36 AM   #8
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Seems like some LockTite or Permatex ThreadLocker might solve the problem of them loosening up. Obviously you would want to use the removal type, same as the auto makers use on many of their fasteners. Just a thought...
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Old 10-28-2015, 07:27 AM   #9
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Seems like some LockTite or Permatex ThreadLocker might solve the problem of them loosening up. Obviously you would want to use the removal type, same as the auto makers use on many of their fasteners. Just a thought...
They also loosen since the gasket compresses over time. So even with locktite they still need to be checked.
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Old 10-28-2015, 07:18 PM   #10
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Thank you all for your great suggestions!

My air conditioner bolts were loose, and I have tightened them.
I will check this annually.

Now the hard part is waiting 5 months for spring camping to roll around again

Robert
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