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Steel roof attatchment question ? #6521804
04/20/19 01:03 AM
04/20/19 01:03 AM
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Posts: 1,311
Indiana
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kyron4 Offline OP
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Indiana
Building a small patio cover (roof) , and my joists are 16" on center. Is it better to screw the metal roof panels directly to the 2x6 joists or do I need to run 1x4 pearling across the joists and screw the panels to those ? Any advice ? -Thanks

Re: Steel roof attatchment question ? [Re: kyron4] #6521809
04/20/19 01:23 AM
04/20/19 01:23 AM
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rogers city mi.
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jeff karsten Offline
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I assume by joists your talking rafters and yes you have to run purlins and screw to them otherwise your tin would sag personally i'd use 2x4s but I don't know your roof size or snow load


olden tyred
Re: Steel roof attatchment question ? [Re: kyron4] #6521810
04/20/19 01:26 AM
04/20/19 01:26 AM
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rogers city mi.
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jeff karsten Offline
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normally 4 screws 9 in centers as opposed to 2 on 16 in centers and your overlap would be unsupported


olden tyred
Re: Steel roof attatchment question ? [Re: kyron4] #6521811
04/20/19 01:29 AM
04/20/19 01:29 AM
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Posts: 34
ND
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Silage Offline
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ND
We use 2x4's. 30 inches or less spacing.

Re: Steel roof attatchment question ? [Re: kyron4] #6521816
04/20/19 01:43 AM
04/20/19 01:43 AM
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Posts: 33
WI,USA
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GordenHere Offline
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WI,USA
All of the above answers will work. I used to be a timber framer. We would also throw on steel roofs. We would screw the steel on directly over stress skin panels (osb sandwiched over Styrofoam). In your case you could lay down some plywood and sheet the steel over that. Just another two cents worth.

Re: Steel roof attatchment question ? [Re: kyron4] #6521823
04/20/19 02:26 AM
04/20/19 02:26 AM
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Indiana
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kyron4 Offline OP
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Yes, rafters, pulling a 12 hrs shift tonight lol. I never thought of the over lap, that could have been bad this winter. I don't know if 2x4's will work, The back door only has a few inches before the eaves , and I think 2x4" would put the roof above the over hang of the house roof and I need to be under so water doesn't run down it. So would 1x4's 24" on center hold up here in northern Indiana ?

Re: Steel roof attatchment question ? [Re: kyron4] #6521828
04/20/19 03:22 AM
04/20/19 03:22 AM
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Posts: 1,482
Ne pa
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Jerry Jr. Offline
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We used 5/4 on 2' centers for our house. Holding fine here in northern pa. I also work a 12hr rotating swing shift. On nights right now too. They suck.


Time is more precious than gold if you know how to spend it
.... but what do I know, I'm just a dumb farmer.~My Dad
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Re: Steel roof attatchment question ? [Re: Jerry Jr.] #6521838
04/20/19 05:29 AM
04/20/19 05:29 AM
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Posts: 1,311
Indiana
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kyron4 Offline OP
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Indiana
Originally Posted by Jerry Jr.
We used 5/4 on 2' centers for our house. Holding fine here in northern pa. I also work a 12hr rotating swing shift. On nights right now too. They suck.


Sorry, not a carpenter, but is 5/4 a type of 2x4 ?

Re: Steel roof attatchment question ? [Re: kyron4] #6521845
04/20/19 06:34 AM
04/20/19 06:34 AM
Joined: Feb 2015
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Morgantown, WV
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Dfabs Offline
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Originally Posted by kyron4
Originally Posted by Jerry Jr.
We used 5/4 on 2' centers for our house. Holding fine here in northern pa. I also work a 12hr rotating swing shift. On nights right now too. They suck.


Sorry, not a carpenter, but is 5/4 a type of 2x4 ?


5/4 is 1 1/4” thick. They are usually used for deck boards.

Re: Steel roof attatchment question ? [Re: kyron4] #6521846
04/20/19 06:46 AM
04/20/19 06:46 AM
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Mi, Mecosta
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ambush32 Offline
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Mi, Mecosta
5/4 around here comes in at 1 1/16” or 1” just depends on how wet the decking is...

5/4 is usually the rough thickness which is 1 1/4”

Gordenhere might have your solution...Plywood, you can get the thickness you need and still support the steel...


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Re: Steel roof attatchment question ? [Re: kyron4] #6521855
04/20/19 07:04 AM
04/20/19 07:04 AM
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Posts: 1,482
Ne pa
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Jerry Jr. Offline
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Yeah. My buddy has a saw mill so I got alot of our lumber from him. 1x4" should be plenty for you. Fasten them to the rafters well.


Time is more precious than gold if you know how to spend it
.... but what do I know, I'm just a dumb farmer.~My Dad
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Re: Steel roof attatchment question ? [Re: kyron4] #6521864
04/20/19 07:23 AM
04/20/19 07:23 AM
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perry co.Pa
wetdog Offline
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If your door is that close to the eaves, you may not be able to open the door the whole way when the rafters are installed. If you have gutter already above the door you could do this
[Linked Image]
This would allow you to put a steeper pitch to the roof and you will not have to shovel snow off of that roof so often.

Re: Steel roof attatchment question ? [Re: kyron4] #6521874
04/20/19 07:55 AM
04/20/19 07:55 AM
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Tug Hill, New York
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Albert Burns Offline
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With our snow load (80 + lbs. psf) we have a tendency to overkill everything we build. A 1 X 4 on 24" center for purlins would work in your case. We usually deck everything completely with 5/4 Larch, cover it with ice and water, and then either put purlins down, or attach directly to that depending if it will be heated or not. If it was mine, and I was going to be looking at the underside of it frequently and it is small, why not deck it with tongue and groove pine ? It wouldn't cost much more, and would be much more attractive when finished then looking at the underside of the steel panels. Just a thought.

Re: Steel roof attatchment question ? [Re: kyron4] #6521892
04/20/19 08:15 AM
04/20/19 08:15 AM
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Perham Minnesota 54
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racerboy108 Offline
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Another option if height is a problem is run short blocks in between your joists flush with the top.

Being a small roof the extra work and time won't be to bad. If your joists are 16 inch on center the blocks would be approximate 14.5 inches long.

Blocking could be 2 by 4 or 2 x 6 being the same as your joists and allowing you to finish underside if you desired.

Re: Steel roof attatchment question ? [Re: kyron4] #6521916
04/20/19 08:39 AM
04/20/19 08:39 AM
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Maine, Aroostook
Posco Offline
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Metal roofing is more common here than asphalt shingles. Most tend to run 1" x 3" strapping horizontally at 2' on center. More than adequate.

Re: Steel roof attatchment question ? [Re: wetdog] #6522106
04/20/19 02:16 PM
04/20/19 02:16 PM
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Indiana
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kyron4 Offline OP
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Originally Posted by wetdog
If your door is that close to the eaves, you may not be able to open the door the whole way when the rafters are installed. If you have gutter already above the door you could do this
[Linked Image]
This would allow you to put a steeper pitch to the roof and you will not have to shovel snow off of that roof so often.


I like this idea , as I now see where 2x6's may not work due to door clearance and getting a good pitch. If I go up to 6x6 post how far can I space them ? That looks like 12', with 4x4's I was going to go 8'. -Thanks

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