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Old 02-24-2016, 02:21 PM   #151
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A/C Bolts that are loose, many affected

I have had 3 rigs, 2 weren't Jayco and all the AC's were secured the same way. The place it attaches is more like thin metal and the "bolts" are more like long screws.
Biggest mistake you can make is to wrench them down to tight. They just need to be snug enough to seal the rubber gasket and checked every season.

There is another current thread on this , a sticky thread and gobs of threads on every forum about it.
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Old 09-18-2017, 11:04 PM   #152
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A/C gasket vs sealant

Can anyone explain to me why the A/C uses a gasket to seal instead of a positive sealant like dicor or butyl tape? seems to me the foam gasket is the least reliable system of sealing they could come up with.

I am just about to reseal my A/c after extensive water damage and rebuilding a major portion of my 23B's roof... I raised the area the A/c goes to allow for some sag in the roof, and am going to eternabond tape the hole where the roof membrane was cut...but I still do not see the advantage of using a foam gasket over laying a bed of sealant down.

Just looking for an explanation from the RV gurus on here...any one ever use something better then a gasket?
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Old 09-18-2017, 11:43 PM   #153
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Quote:
Originally Posted by PennYanguy View Post

Im going to eternabond tape the hole where the roof membrane was cut...
That should have been done at the factory in the first place, shame on Jayco for this one!
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Old 09-19-2017, 04:45 PM   #154
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My mount bolts were loose and tightened them down 3 years ago and check them every spring and have not had to do it since. I do keep mine inside during non use but it is out about 12-14 weeks so it does get the weather but not as much as one that sits out all the time. Not sure why the gasket, probably easier and faster...
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Old 09-19-2017, 05:26 PM   #155
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Originally Posted by PennYanguy View Post
Can anyone explain to me why the A/C uses a gasket to seal instead of a positive sealant like dicor or butyl tape?

Just looking for an explanation from the RV gurus on here...any one ever use something better then a gasket?
Because that is what has been used for years (first a/c I installed in 1977 had the foam gasket) without issue. I have never had a leak on 8 different units.

If Dicor or other type sealants were used replacing an a/c unit without tearing up the roof would be impossible.
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Old 09-19-2017, 06:25 PM   #156
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Makes sense we have not had a problem either since 2005!
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Old 09-19-2017, 06:30 PM   #157
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Replaced mine gasket after the first sign of water intrusion. Installed 1/2 x 2" ply under the roof material and then the gasket so water intrusion can be avoided.
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Old 09-19-2017, 06:48 PM   #158
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Originally Posted by PennYanguy View Post
snip..... I raised the area the A/c goes to allow for some sag in the roof,......snip
Sounds like you may have an older 23B, if so, they were notorious for water pooling around the A/C due to the flat roofs. IMO the roof would "settle" a little around the A/C as time passed....., my BIL's 23B did.

If your rebuilding a good portion of an older 23B's roof, may want to consider getting rid of the TPO roofing material "if" it has the fleece backing, the fleece just wicks moisture everywhere once it's been compromised.

Bob
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Old 09-19-2017, 07:40 PM   #159
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IMO the weight of the ac bouncing around on the roof while traveling would compromise any type of caulk sealant. Also the vibration of the unit would be transferred all over the rig when it was running. Maybe they just did it the right way.

I have never had one leak in 5 rigs with roof ac. Only one I ever had to tighten was my last one and only once.
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Old 09-19-2017, 10:30 PM   #160
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That is exactly what I plan on doing... My only reason to question is I have been in the marine industry for years...we install everything with sealant...even above the waterline... I have never heard of using a piece of foam to properly seal anything...since the Rv roof is non-solid (styrofoam core) I can see the potential of sheering the core with too much load oscillation, but why a foam gasket with no adhesive...nothing actually seals to the roofing membrane.

My A/C was tight, the gasket was about 1/2 compressed...but it was still evident there was water seeping underneath it...destroyed the roof but never leaked a drop in the RV!

Has anyone ever sealed the gasket to the roof deck as well as stick it to the AC? if so...what did you use and was it successful.

I plan on raising the ac hole 1/2" and replacing about 16 sf of roof deck. Yes, I have the felt back roofing, but at this time I am not equipped to replace it...I only want to give it a good fix and move on. I am using 1/4" Marine grade ply, and will epoxy all wood I am leaving in as well as whatever I am putting in new.
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