2x6 tongue and groove as roof sheathing over deck

Roofing/Construction Questions
1

18x16 gable roof over my deck with exposed rafters and no ceiling. Plan is to use 2x6 T&G sheathing, since it would require no plywood or OSB overlay and 1" roofing nails wouldn’t penetrate beneath.

Can I span place rafters 4 to 6 ft OC using the 2x6 plank sheathing, and would rafter ties every 6 ft be sufficient for the latter? I like the idea of fewer rafters and ties underneath to look less cluttered, since I’m not doing a cathedral ceiling.

Thanks in advance

2

[quote=“Squindle”]18x16 gable roof over my deck with exposed rafters and no ceiling. Plan is to use 2x6 T&G sheathing, since it would require no plywood or OSB overlay and 1" roofing nails wouldn’t penetrate beneath.

Can I span place rafters 4 to 6 ft OC using the 2x6 plank sheathing, and would rafter ties every 6 ft be sufficient for the latter? I like the idea of fewer rafters and ties underneath to look less cluttered, since I’m not doing a cathedral ceiling.

Thanks in advance[/quote]

You need an Architect or Engineer for this.

3

Thats an expensive deck and lot of work remember grade 2 lumber is not that stright, 4 oc is all you wanna go, it will work, but there is going to be issues along the way.

4

I’ve decided to use 4x6 rafters 4’ OC, 2x6 T&G sheathing, and felt and shingles directly over the T&G. I’ve found some span tables for 4x6 rafters from a few municipalities. I’m in Alabama, so perhaps shear is not a significant factor that requires plywood overlay? Any professional advice is welcome.

5

I think the exposed beam look with the exposed T&G will be worth the extra cost, which is not that significant since no labor costs.

Anyone ever mounted porch roof posts in side house wall behind siding. My plan is to use 4x6s for that also. Any thoughts.

6

You should be fine since you’re in Alabama you don’t have to be concerned about snow load. I’ve seen camps, cottages, & shacks built with 1’‘x 6’’ rafters, 1’’ x 6’’ ridge pole, & 1’’ x 6’’ tongue groove decking last a hundred years spanned 18’’ to 20’‘, 22’'!

7

Vented R-Board is real nice for something like that application but big money. You’ld get a high R-Value & save on electricity if you pipe air conditioning in there sometime.

8

I’ve never seen a 1x6 rafter before.
Gotta be pretty difficult to install any kind of sheeting into something that is only 3/4 inch thick total.

9

Oh ya Roof Lover. I ain’t bullshittin’ ya! Old camps & summer homes. Some don’t even have a ridge board/pole.