Need some help
Need some help
(OP)
I have a client wanting to do something I am afraid will not work. Doing a one story home, 63'-0 width x 39'-0 depth with a 6:12 gable roof, with a semi vaulted ceiling. The exterior walls at 8'-0 and in the interior walls at 10'-0. The vault follows the rafters till 10'-0. I am designing for 90 mph winds, 15 lbs psf contruction load and a dead load of 15 lbs psf on the roof. Based of the NDS span tables (my rafter span is 19'-6) I am using a 2x10 rafter. My celing joist span will be from the furthest rafter to an interior wall @ 20'-0 allowing me to use 2x10 ceiling joists. My fear is since the ceiling joist do not tie into the exterior wall, (they will be lag bolted with two 3/8' lags into the rafter), the loading of the roof will tend to push the exterior walls out. I have a total tributary width of 19'-6 at the ridge board. I have considered a ridge beam to alleviate some of the loading from the roof, but the span between columns for the ridge beam will be 21'-0 making the ridge beam be 10 x 16 to support the load. Are my calulations right for the ridge beam right?
Thanks in advance
Brian
Thanks in advance
Brian






RE: Need some help
RE: Need some help
RE: Need some help
RE: Need some help
post a sketch if you can.
RE: Need some help
RE: Need some help
And, as previously mentioned, a truss package might be able to be used which would be cheaper than stickframing the roof/ceiling structure.
Best to engaqe a structural engineer as previously mentioned here. There a lot of things to consider here.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask