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Old 06-16-2009, 03:36 PM   #1
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Armstrong AC Removed---Now What????

Yesterday, I removed an old Armstrong AC unit from a 1978 Argosy Minuet. It now has the 14" x 14" rough opening, but there is no frame or support to mount the new A/C unit. There is just the flimsy aluminum of the roof and the inner ceiling. What to do? Do I make shims between the panels? Use aluminum? Pressure treated wood? Sorry, I had never seen this question addressed here before.
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Old 06-16-2009, 05:28 PM   #2
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My husband made a 2by4 frame between the ceiling and the outside skin. You are correct there is nothing up there to support an AC

Annette
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Old 06-16-2009, 08:43 PM   #3
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I'm not sure I understand. Something must be supporting the old ac unit. I would call a dealer to see how they mount new units to old trailers.
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Old 06-16-2009, 09:36 PM   #4
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As you can see in this photo, the old unit was attached over a wide area of the roof. There were dozens of screws along the edge where the sealent remained. By the way, can you guess who the man in the hole is? He is an active forums member...


The new unit clamps with 4 bolts between the outer and inner skins. You must brace between the two skins to support the unit.
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Old 06-16-2009, 10:54 PM   #5
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The old Armstrong units were attached with about 30 screws in a square that was about 20"x20". I got rid of the AC and replaced it with a fantastic fan. I found that covering the screw holes with a large aluminum plate, lots of Sikaflex and rivets. No leaks! I would recommend you do this then cut out for the new AC unit. I framed the old hole with pressure treated lumber. Unless you have a metal stretcher/shrinker you will need to cut the roof contour in wood.
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Old 06-17-2009, 10:07 AM   #6
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Thanks for all the info listed here. I did as suggested and made a rough in frame of pressure treated wood 2" x 2". This I tacked in place and sealed well with vulkem. The rain we are having in this area has been a good test of my project. So far, no leaks.
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Old 06-17-2009, 02:07 PM   #7
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Thanks for all the info listed here. I did as suggested and made a rough in frame of pressure treated wood 2" x 2". This I tacked in place and sealed well with vulkem. The rain we are having in this area has been a good test of my project. So far, no leaks.
The other test is what will happen when the trailer hits serious bumps.

The "stringers" should be attached to the main bows, fore and aft of the hole. That's where the strength will be.

Andy
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