Shed Style House Roof Framing

[jw_shade]

I am in the process of drawing plans for a new home construction with outside walls being 32' x 64', a very simple rectangle. I am working on the unique (I assume) idea of framing it with a true shed/lean-to/monoslope style roof with a 3:12 (14*) slope. The roof span will run the length of the 32' with rafters spaced appropriately across the 64' length. The front (64') wall will be approximately 19' high from foundation to top plate. I am doing this to allow for a loft running 44' along the front of the house and a 19' vaulted ceiling along the other 20'. I am posting here to ask for any ideas, suggestions, critiques. Please feel free to hit me with all the problems I should expect to run into with this type of design. I have some floor plans (PDF) ready to upload for a clearer picture of what I'm planning... This home will be built in Central Ohio on slightly sloped ground contour.

[bighammer]

are you planning on using pre-built trusses or how do you plan on framing the roof??
Pre-built trusses with a "mono-slope" 3/12 pitch will have a height of 8' plus heel hgt. so you have an 19' plate hght plus your 8'-6" truss for a total height of 27'-6" - that is gonna be a good wind break - on a 3/12 pitch what do you plan on using for roofing materials?? The snow will have a hard time removing itself off the roof with that shallow of a pitch -

[jw_shade]

I'm actually thinking of using a combination of trusses and I-joist rafters. I place a pre-built truss at each end of the house. And one more about 1/3 from the right end. In between would be i-joist rafters spaced 16" or 24" OC running parallel to the upper chord of the three trusses. These rafters would span from the rear wall 16' to the center bearing wall, then 16' more to the front 19' wall... I do see your point about the ability of a 3/12 to shed snow. Another possibility I was considering was increasing the slope to 4/12 and going with a half-gable style roof with the peak being about 22' high. The rear slope would span about 26', meeting the front slope about 6' from the front wall (which would now be around 18' feet high)

[Don_P]

Hi jw_shade, welcome to the forum.
These are the sketches he sent me.

You're probably into engineering in the master bedroom tall walls. They are at best a balloon framed 2x6 wall 12" on center.

Backing up a bit, is there a reason for not framing the roof as someithing more along the lines of a 10/12 gable and having the loft centered?

[jw_shade]

I did actually make some changes. Made it a gable roof with 5/12 that peaks 6 ft from the front wall at 19'6". I left the loft the same though. I will email you the new framing of the right wall. Front wall will now be 17'4". I will email you the new jpeg

[Don_P]

This should be the pic.
Try clicking the "go advanced" tab and see if it'll let you post a pic now. I've tried to turn that on for you.

The wall should be balloon framed with full length studs from floor to roof, no hinge in the middle. Look to the codebook stud wall chart for minimum stud dimensions. I would take that to the contractors desk at the building supply and have them design rafters and support. I'm coming up with a 28' long rafter, plus overhang that's going to be ~a 30' stick.

[jw_shade]

Where can I find the advanced setting? I definitely see what you mean with the balloon framing. Should I do the same across the entire length or just the 20' bedroom section? And stick with platform for the loft? I really appreciate your help. I just purchased Home Design Platinum software from Punch, so I'm switching my plans over from the very basic Sweet Home 3D I had been using so far. Do you have any experience with or recommendations when it comes to these types of programs? Thanks again

[Don_P]

When you scroll down the page to the "Quick Reply" window, look underneath it, does yours have 2 tabs, one marked "post quick reply" and the other "go advanced"? If so click "go advanced".

I would frame from diaphragm to diaphragm, so platform frame where there is a floor to provide lateral resistance and frame full length studs from floor to roof when they are the only diaphragms, no midwall hinges.

I really like googles free Sketchup program.
The second pic is what it would look like with an 8/12 attic truss.