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Old 01-05-2012, 07:46 PM   #1
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Metal roof


Building a new garage,Can i just install strapping on top of trusts and screw metal roofing to strapping or should i install 7/16 chipboard on top of trusts and then screw metal roof to chipboard? And should i put water and ice shield underneath metal roof in case of condensation.

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Old 01-05-2012, 09:00 PM   #2
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Metal roof


I see people put metal over solid sheeting, but it sure seems like it would sweat alot. But if it's felted good...
The metal I have installed either went on metal purlins, or on residences, 1x3 skip sheeting, spaced the width of 2 1x3's (5").

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Old 01-05-2012, 10:30 PM   #3
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Metal roof


You don't need full sheathing, purlins will do just fine.

You don't need ice & water on an unheated garage ... and if you go with the purlins you'll have nothing to stick to, anyway.
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Old 01-06-2012, 12:15 AM   #4
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Metal roof


you can get condensation whether it's heated or not
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Old 01-06-2012, 12:27 AM   #5
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Metal roof


Depends on what type metal roofing you installing.
Some of the roll locks require a soild roof.
Look on the manufactures web site.
If it's just the cheap stuff like what's at Lowes or HD then skip sheet will be fine.
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Old 01-06-2012, 12:42 AM   #6
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Quote:
Originally Posted by joecaption View Post
Depends on what type metal roofing you installing.
Some of the roll locks require a soild roof.
Look on the manufactures web site.
If it's just the cheap stuff like what's at Lowes or HD then skip sheet will be fine.
Now that you mention it an old boss of mine had me run full plywood for a metal roof (I didn't do the metal). I thought it was wrong at the time. Maybe not.
We've also put solid sheeting under clay tile, which I thought was odd.
(on that job, the trusses were still 2' o/c, per manufacture specs. It turns out tile is actually lighter than comp., as they kind of bridge themselves from truss to truss).
If all else fails, after you've tried everything else, read the manufacturors instructions.

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