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Old 08-09-2012, 05:18 PM   #16
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Number of rafter ties in an 18' x 18' detached garage


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Originally Posted by AndyGump View Post
If you are trying to keep out excessive heat from radiation off the roof deck you might look into installing a radiant barrier on the rafters.
That would probably just consist of a paper product that has an aluminum foil on one side and you can just staple it to the underside of the rafters.
Good idea in principle and could well keep his garage cooler, though 2 concerns spring to mind.
1. if its a foil-faced paper product just stapled on, it will tend to 'rustle' even in a low breeze, and the noise can be annoying if you work in there any length of time (I know this from personal exprience of having done just that in my own garage!).
2. More seriously, I wonder if it would tend to cause excessive heat build-up in the deck itself, possibly damaging the shingles.
(the OP is in Los Angeles; my brother has friends living in a place there called Valley Village and in the summer he says its like living in a furnace!)

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Old 08-09-2012, 05:51 PM   #17
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Number of rafter ties in an 18' x 18' detached garage


I agree Andy in regards to non-vented attic space. You just have to verify if the shingle manufacturer will provide a warranty for hot-roof installation. Being on the ocean/hurricane prone region, I prefer non-vented attics to prevent water intrusion through the vented soffits and ridge.
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Old 03-13-2013, 12:34 AM   #18
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Number of rafter ties in an 18' x 18' detached garage


I'm also in the LA area and have a similar garage with similar (possibly inadequate) rafters ties with the inconveniently positioned diagonal braces. I was wondering if you started or completed your project and whether you consulted an engineer. I have attempted to contact a few online and nobody has been helpful thus far. Thanks.
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Old 03-13-2013, 04:48 PM   #19
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Number of rafter ties in an 18' x 18' detached garage


In the end, the inspector agreed that if I wanted to do anything with the ceiling beyond hanging a few more light wraps that I'd have to shore it up substantially.
He was fine with drywalling the interior walls, so I did that, and then built storage cabinets and a work desk. I brightened up the ceiling by painting it white.

In the end it looks fine. Next time the shingles need replacing I'll use that opportunity to shore up the ceiling and finish it the way I originally planned.
Hope this helps.
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Old 03-13-2013, 10:31 PM   #20
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Number of rafter ties in an 18' x 18' detached garage


Has anyone determined how wide the building is?

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