Originally Posted by azflycaster
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.