Shed / Patio build roof framing 2x4 or 2x6?

[mxnerd]

I'm going to build a 14x7 shed / patio (no wood foundation and wall, but it will be over concrete slab) that will have OSB roof , covered with tar paper and asphalt shingles (not shown in the picture), the back & left side of the shed will be against a stucco wall.

Do I have to use 2x6 lumbers for roofing or I can get away with 2x4 (10 pieces 7ft long & 3 pieces14ft long)?

 

[herm0016]

For the 14 foot peice, 8 or 10. For the rafters, 2x6 I would say. Does it snow there?

 

[mxnerd]

It doesn't snow in Southern California.

So you mean everything over 8ft, I should use 2x6?

 

[herm0016]

http://www.awc.org/codes-standards/calculators-software/spancalc

 

[herm0016]

The calculator, assuming spf construction grade lumber, says 2x6 for the rafters at 7 feet and 2x10 for the 14 foot long joist.

 

[mxnerd]

http://www.awc.org/codes-standards/calculators-software/spancalc

Thanks for the info!

 

[mxnerd]

The calculator, assuming spf construction grade lumber, says 2x6 for the rafters at 7 feet and 2x10 for the 14 foot long joist.

So the 7 footer is considered as rafter, not ceiling joist? And how do I choose the live load psf (with or without people on top)?

 

[Humpy]

I think you can safely minimize the load estimates with that calculator which would allow for 2x4 rafters. It essentially only has to support its own weight. The issue is still the 14' span though.

If possible i would add the 6th post and use 2x6 rafters 24" on center, and 2x8 for the beams.

Is it flat? Using shingles?

 

[mxnerd]

I think you can safely minimize the load estimates with that calculator which would allow for 2x4 rafters. It essentially only has to support its own weight. The issue is still the 14' span though.

If possible i would add the 6th post and use 2x6 rafters 24" on center, and 2x8 for the beams.

Is it flat? Using shingles?

I'll build this myself, I know I won't step on the roof to nail down the OSB sheets because I feel nervous on non solid ground.

I definitely can add 6th post, but I like the openness of the 14ft span. I'll think it over.

It's basically flat, but the slab slopes lower towards the stucco wall. I will use asphalt shingles.

 

[paperfist]

Seems like a long span for 2x4s. OSB and Asphalt singles aren't exactly lite.

Is this for storage or something to keep you dry?

 

[mxnerd]

Just keep it dry in the winter and keep the scorching sun out in the summer.

Will have some garden tools & and a sink for washing veggies and dirty hands.

I think I'll just add 6th post and make it easier.

Thank you all.

 

[paperfist]

It wouldn't be the end of the world to just use 2x6s around the perimeter and keep the rest 2x4s if you don't want the 6th post. Other wise I think you'll get sagging in the front center.

 

[twinrider1]

You'll need some sort of slope on a shingle roof.
The slab sloping towards a wall isn't good, though I guess the roof will help with that.
Will this be free standing or are you connecting it to the stucco walls?

 

[mxnerd]

It's free standing but I'll use anchor bolts to attach the shed to the concrete ground & stucco walls.

You are right, the slope seems not enough for the shingle roof, I'll need to make front posts longer than the back ones in order to fit the 2/12 ~ 4/12 pitch, otherwise water probably will work its way up.