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Topic: Roof Sealant and End Cap caulking (Read 610 times) previous topic - next topic
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Roof Sealant and End Cap caulking
Hi.  I just bought a 2005 Lazy Daze 26.5 mid bath and it needs new sealant around the air conditioner on the roof and new sealant along the corner molding seams in a few places. The Lazy Daze Owners Manual says to use ”special sealant” on the roof and “factory sealant” along the seams. Could someone please tell me what these sealants are?  Of course, I want to use the correct stuff so the sealant will adhere to the materials and last many years. Thanks so much.
Re: Roof Sealant and End Cap caulking
Reply #1 –
Welcome to the Forum.
The "special sealant" is a polyurethane adhesive and sealant.
My favorite is 3M 5200 Fast Cure; many here use Loctite's polyurethane sealant.
Besides the end caps, the window frames need periodic resealing. along with the roof seams
Window and seam sealing | Flickr
Roof seam reseal | Flickr

The A/C is sealed with a compressible foam gasket that is glued to the roof; it cannot be sealed from the outside, and leaks usually require the replacement of the gasket. There are 3 or 4 screws under the interior plastic cover that can loosen, sometimes causing leaks. They can be snugged up, do not crank down these screws!
If this does not fix the leak, the gasket will need to be cut, the A/C lifted off, and the gasket replaced.

Search for roof, end cap, and window frame resealing, there is a lot to read and learn.
Have fun!

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Roof Sealant and End Cap caulking
Reply #2 –
Thank you, Larry. I do not have any leaks and it appears that no leaks have ever been present. The roof looks great except for around the air conditioning unit, which is showing signs of cracks. Maybe somebody put sealant around it even though it was not necessary? A new air conditioning unit was installed in 2018. And the roof is resealed in 2021. The sealant around the air conditioning unit is different than on the rest of the roof, so I don’t think they resealed around the air conditioning unit in 2021. I called the place that resealed the roof in 2021 and they said they used CSL liquid leveler. So far it is holding up nicely.
Re: Roof Sealant and End Cap caulking
Reply #3 –
Quote from: Vincent  - 
I don’t think they resealed around the air conditioning unit in 2021. I called the place that resealed the roof in 2021 and they said they used CSL liquid leveler. So far it is holding up nicely.

I assume they glued the foam gasket to the roof with the silicone sealant shown in the link below, There is nothing sealable; the A/C body overhangs the gasket, preventing access.
Tiffin RV CSL White Silicone Self-Leveling Sealant 5536 – RPM - RV Parts Masters

Keep your LD sealed, and it will last a long time.
Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze
Re: Roof Sealant and End Cap caulking
Reply #4 –
Larry, I removed the air conditioner and found someone put sealant tape on the roof before setting the air conditioner on the roof. Fortunately the sealant tape did not damage the gasket on the bottom of the a/c unit when I removed it, so all I had to do is remove the tape, clean the roof real good and put the a/c unit back in place. I tightened the four a/c bolts enough to compress the gasket about 50%, sprayed a bunch of water around the base of the unit while my wife checked for leaks inside. All is well. Thanks so much for your help.