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Old 02-13-2020, 07:27 PM   #1
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material to use for skylight deck


I have an odd space framed for a skylight. Itís a flat deck about 6íx3.5í.

Itís the horizontal surface in the picture.

Can I throw some scrap 5/8 sheetrock up there and then cover with a 1/2Ē plywood?

Would that be able to support a 165lb person doing finish work up there?

Once the work is finished, Iíd leave the 5/8Ē sheetrock up there and cover with a 3/4Ē white kitchen panel. Will sort of Match the paint.

Itís framed with 3 5/8Ē 20 gauge metal studs. 16 oc.

Obviously I have these pieces on hand and would like to use them up.

Most likely the space wonít be used. But maybe Iíll throw some plants up there. Kitchen panel would be easy to clean.

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Old 02-13-2020, 07:44 PM   #2
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Re: material to use for skylight deck


I think I would put temp support under it while i was doing the work in there.

It would have been a good place for a little wood framing.
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Old 02-13-2020, 08:20 PM   #3
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Re: material to use for skylight deck


It is an odd space and going to be a dust catcher when done. I didn't think steel joists were suitable for horizontal members but don't really know. I'd be inclined to toss in some 2x stringers under some OSB or ply just to be sure. Don't be surprised if you get some movement in the drywall ceiling that is underneath it.
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Old 02-13-2020, 08:31 PM   #4
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Re: material to use for skylight deck


Quote:
Originally Posted by lenaitch;
It is an odd space and going to be a dust catcher when done. I didn't think steel joists were suitable for horizontal members but don't really know. I'd be inclined to toss in some 2x stringers under some OSB or ply just to be sure. Don't be surprised if you get some movement in the drywall ceiling that is underneath it.


Good point on drywall movement below. Maybe Iíll have the deck finished first. Then get the drywall below finished.

Thx
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Old 02-13-2020, 09:54 PM   #5
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Re: material to use for skylight deck


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Originally Posted by jaketrades View Post
Good point on drywall movement below. Maybe I’ll have the deck finished first. Then get the drywall below finished.

Thx
When you are done, don't forget the sign for renters.

I would use 2 layers of 3/4" plywood on that so there would be less bending and more even load on all members and the screws holding them.




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Last edited by Nealtw; 02-13-2020 at 09:57 PM.
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Old 02-13-2020, 10:06 PM   #6
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Re: material to use for skylight deck


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Originally Posted by Nealtw;
When you are done, don't forget the sign for renters.

I would use 2 layers of 3/4" plywood on that so there would be less bending and more even load on all members and the screws holding them.





Think itís worth throwing some wood blocking bw the horizontal studs?
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Old 02-13-2020, 10:21 PM   #7
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Re: material to use for skylight deck


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Think itís worth throwing some wood blocking bw the horizontal studs?
I think it would be worth it to put 2x4 beside the steel and open the walls below so those 2x4 can run into the walls and then add studs below them for support.
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Old 02-14-2020, 08:08 AM   #8
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Re: material to use for skylight deck


In hindsight, I wouldn't use 2x stringers as they might tend to focus any weight and movement. OSB/ply will likely tend to spread it out better. I would make sure it is secured well, particularly around the edges. Aren't steel studs just clipped in at both ends? I'm not sure they're designed to hold much weight - normally they just hold up drywall.
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Old 02-15-2020, 06:26 PM   #9
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Re: material to use for skylight deck


Quote:
Originally Posted by lenaitch;
In hindsight, I wouldn't use 2x stringers as they might tend to focus any weight and movement. OSB/ply will likely tend to spread it out better. I would make sure it is secured well, particularly around the edges. Aren't steel studs just clipped in at both ends? I'm not sure they're designed to hold much weight - normally they just hold up drywall.

The studs themselves can hold a decent amount of weight. The problem is the screws that secure the vertical to horizontal plan are going thru fairly thin gauge metal.

As a test Iím going to build a small metal stud box. Secure it to the floor and put a layer of sheetrock followed by plywood. Then stand on it. Jump on it. If it holds Iíll have some confidence in my plan.
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