Water from roof

[Qstaar17]

After replacing a broken AC shroud, I noticed when it rains, water gets into the RV and there’s water spots on the ceiling. Looking for sealant recommendations to put around the roof AC unit to stop water from entering. Thanks

[Podivin]

It seems odd that replacing a shroud would cause a leak, but this is the stuff to use around the AC unit, or any other seam on the roof.
https://www.amazon.com/Dicor-Self-Le...58333851&psc=1

It COULD be that water is coming in farther away and that it's just making its way through the ceiling at the AC opening. So as long as you're on the roof check/seal any other openings or seams.

[Dunrollin]

Two things come to mind. First, in many units the water collects into a little plastic trough and goes out a hole in one end. That hole often gets plugged and needs to be kept clean. If it is working OK the water just rolls off the roof. Some units have a drain that collects the water and sends it to the ground.

Also there is a foam gasket under the AC unit and if you are having a leak from the AC to the interior of the motorhome that gasket should be changed out. It is about a 30 minute to one hour job and requires average skills. There are lots of videos on this task, just remember to tighten it carefully as too tight is worse than not tight enough.

If these two things are completed you shouldn't need to add sealant around the AC.

[wolfe10]

Correct-- NO SEALANT.


Replace the foam gasket-- torque evenly so that gasket is compressed to 1/2 its original height.


Easy job with two people-- not really heavy, but bulky and much easier to place properly with two.

[MSHappyCampers]

It could be that the bolts that pull the A/C unit down against the foam gasket are not tight enough. I would try that first.

[Qstaar17]

Originally Posted by Podivin

It seems odd that replacing a shroud would cause a leak, but this is the stuff to use around the AC unit, or any other seam on the roof.
https://www.amazon.com/Dicor-Self-Le...58333851&psc=1

It COULD be that water is coming in farther away and that it's just making its way through the ceiling at the AC opening. So as long as you're on the roof check/seal any other openings or seams.

Thanks for responding. It started letting rain in immediately after the shroud was replaced. I believe I need the gasket mentioned by the others.

[Qstaar17]

Originally Posted by Dunrollin

Two things come to mind. First, in many units the water collects into a little plastic trough and goes out a hole in one end. That hole often gets plugged and needs to be kept clean. If it is working OK the water just rolls off the roof. Some units have a drain that collects the water and sends it to the ground.

Also there is a foam gasket under the AC unit and if you are having a leak from the AC to the interior of the motorhome that gasket should be changed out. It is about a 30 minute to one hour job and requires average skills. There are lots of videos on this task, just remember to tighten it carefully as too tight is worse than not tight enough.

If these two things are completed you shouldn't need to add sealant around the AC.

Thanks, I’ll look for the hole and the gasket. I don’t recall seeing either.

[Qstaar17]

Originally Posted by MSHappyCampers

It could be that the bolts that pull the A/C unit down against the foam gasket are not tight enough. I would try that first.

I gotta find this gasket. I think it’s missing

[Qstaar17]

Originally Posted by Dunrollin

Two things come to mind. First, in many units the water collects into a little plastic trough and goes out a hole in one end. That hole often gets plugged and needs to be kept clean. If it is working OK the water just rolls off the roof. Some units have a drain that collects the water and sends it to the ground.

Also there is a foam gasket under the AC unit and if you are having a leak from the AC to the interior of the motorhome that gasket should be changed out. It is about a 30 minute to one hour job and requires average skills. There are lots of videos on this task, just remember to tighten it carefully as too tight is worse than not tight enough.

If these two things are completed you shouldn't need to add sealant around the AC.

You were 100% correct. After cleaning the water tray with the two little holes and after replacing the foam gasket, all is well. ThankYou for pointing me in the right direction.

[Dunrollin]

Good to hear you are OK. Safe travels!