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Old 03-06-2012, 04:17 PM   #1
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1970 31' Sovereign
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overachiever screwed old a/c down into the roof!

We just removed the old Armstrong AC from the roof of my 1070 Soverign last evening. It had been screwed down, every couple of inches all the way around, then lathered deep with epoxy. It is finally off, but a million little holes remain in the shape of the old AC. Anyone experience this?? What a mess! How do I fix the holes? We ran out of daylight last evening so I don't know if the new AC will cover the holes.
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Old 03-06-2012, 04:23 PM   #2
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Make a big patch to cover it all. No one will ever know it happened but you.
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Old 03-06-2012, 04:33 PM   #3
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That's how AC were installed in the 70s. Mine was the same. The holes will not be covered by the new AC unit and will need to be sealed. I used Olympic rivets on the 40+ holes in my roof.

If you are going to install a new AC, you will need to reinforce the hole by framing it. New AC units attach by champing to the inner and outer skins with a bolt in each corner of the hole.
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Old 03-06-2012, 04:43 PM   #4
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Marzboy just did a patch like Frank said, looks great! See his thread here

http://www.airforums.com/forums/f427...e-87484-3.html
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Old 03-06-2012, 07:02 PM   #5
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There was a steel pan under the AC. The galvanic corrosion literally ate through the roof in places. Many, many screw holes...
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New Alclad being fitted to cover all the damage...
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All ready for rivets...
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Bucked into place, just needing to be cleaned up of vulkem and sharpie lines.

BTW, three Fantastic Vents on "3," move an intense amount of air!
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Old 03-06-2012, 07:17 PM   #6
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Originally Posted by azflycaster View Post
That's how AC were installed in the 70s. Mine was the same. The holes will not be covered by the new AC unit and will need to be sealed. I used Olympic rivets on the 40+ holes in my roof.

If you are going to install a new AC, you will need to reinforce the hole by framing it. New AC units attach by champing to the inner and outer skins with a bolt in each corner of the hole.
Was this the way it was done all the way through the 1970's?

Reason I ask is that I yesterday installed a 15k Coleman to replace a tired, smaller capacity A/C unit on this latest Silver Streak, a 1976 model. It appeard original. It was through-bolted (clamped-mount) just like todays A/C units; the factory had some solid aluminum framing riveted between inner & outer hull with a tape shield (I think I used almost about 12' of NASHUA Weatherproof Tape replicating it).

I "like" those old Armstrong units, but would have thought a change would have been initiated by whomever owned A/S in that period.

.
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Old 03-06-2012, 09:04 PM   #7
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I installed pan head stainless steel screws through butyl and covered with Vulkem. I have tested through two seasons, with no leaking.

<----- Pictures on my blog. Link is on left page under my username.
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