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Tool Talk Discussion Forum

OT: Flat roof to gable

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Slowpoke

07-19-2006 02:16:13




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I have a carport with a T&G roof, 3/8" pitch. I want to change to a gable roof with a 3 in 12 pitch. It's 16' between the rear wall and the 4x12 header in the front. The rafters are 2x8x20' with a 4" overhang in the rear and about 3' past the header in the front. They are on 24" centers. I plan on using 2x4 rafters with a 1x ridge board and leave the original 2x8s as is. Whatever I use for new rafters, do I need to buy those 4x6 metal plates with a thousand nail holes or can I cut large 1/2" or 5/8" plywood plates and sandwich the old/new rafters between them? Of course, I'd put some kind of leg(s) between the new and old rafters about 1/2 way from the top plate to the ridge board. Will it work? Thanks

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Bill in NorthCentral PA

07-20-2006 03:53:35




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 Re: OT: Flat roof to gable in reply to Slowpoke, 07-19-2006 02:16:13  
One municipality I worked in required plywood plates (before our new code change). They said that during a fire, the metal plates "leave go" faster the the plywood and cause faster roofing framing system failure. One manufacturer in the next county over still uses plywood plates.

Without seeing the project, I would consider framing both sidewalls to match in height and set new prefabricated trusses. It might be cheaper, probably faster.

Good luck,

Bill

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Slowpoke

07-20-2006 10:12:05




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 Re: OT: Flat roof to gable in reply to Bill in NorthCentral PA, 07-20-2006 03:53:35  
I figured the current difference in height is about 7". Droping the front header might be the easiest. Another problem is that the rear and end walls are covered with stucco over some kind of exterior sheetrock. I've not seen any similar material in HD or Lowes. It's probably become obsolete since 1960.



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Vern-MI

07-19-2006 05:09:11




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 Re: OT: Flat roof to gable in reply to Slowpoke, 07-19-2006 02:16:13  
You are using 2 x 4's and a 1 x ridge board to create a truss by using the existing 2 x 8's as the bottom runner or collar tie. The gable ends will be on the sides of the car port and the sloped sides would be on the front and back of the car port. As the roof is loaded the 2 x 4's would be loaded in compression and push out and off the tops of the 2 x 8's. The 2 x 8�s would be in tension and must be firmly fastened to the 2 x 4's using either plywood or metal plates glued and nailed to both the 2 x 4's and the 2 x 8's. A truss loads the individual members either in tension or compression and they rely on the attachment points to be firmly fastened. You may want to use the Howe design truss system so that when you are constructing the truss the 1 x ridge beam will be supported by the central vertical 2 x 4�s. I used plywood which I glued, clamped, and nailed at each intersection using Franklin waterproof glue

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Slowpoke

07-19-2006 23:39:33




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 Re: OT: Flat roof to gable in reply to Vern-MI, 07-19-2006 05:09:11  
That's a real good site for truss information...thanks



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VADAVE

07-19-2006 05:01:20




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 Re: OT: Flat roof to gable in reply to Slowpoke, 07-19-2006 02:16:13  
Let's see if I understand--present rafters are 20 ft long so the new ones will be about 10 ft to the ridge. I don't know where you are but here in Virginia I used 2X6 for the rafters and no support leg. You could also put the support leg at the ridge. To answer your question on plywood plates YES that works fine. I have made doors (8ft X 14ft) with plywood plates at the joints on one side and those little nail plates on the other. That is only because the metal skin doesn't lay flat over the plywood plates. Actually using the plates is stronger then then the little nail things.

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