Recent content by CDAIdaho

For the benefit of someone in the future looking for an answer, I spoke to an engineer on Friday. For this span I can use a 1-3/4" x 11-1/4" LVL (same depth as the 2x12) for my rafter and 2x6 purlins 24" OC. The distance between the rafters is 9' 3-1/2" This will give me a 55 PSF snow load...

Good thoughts, ipgenie and jack stand. I think I'll bring it to an engineer and see what they want. I have a copy of an engineered plan for a shop with lean to that is being built down the street and they have 2x12 with the same spacing and 2x6 purlins but the clear span is 10'. The extra 2'...

Thanks for the reply Kinglake. Most shops and lean-to's here are framed with structural (pocket purlins) like my example. I did estimates to frame with traditional rafters like your image (2x10 24 O.C. and it was 45% more expensive for the lumber. It's also easier labor-wise for me doing this...

The rafter spacing is 9' 5" O.C. maximum and the rafter is a 2x12. Purlins are 2x6, 24" O.C. Here is the floor plan with dimensions.

Thanks, Stuart. All the calculators like this show rafter sizing/spacing for spans which is what you use for the purlins. I'm looking for the roof rafter that carries the purlins - what distance I can span with the 2x12. Maybe the render below describes this better.

I am building a lean to on my 30x30 shop that will have 2X12 rafters hung on 6x6 posts with 2x6 purlins 24 O.C. The post spacing is 10'. I would like to maximize the width of the lean to and I am wondering how wide I can make the lean to with a 2x12 rafter with 2x6 purlins. I am hoping to have...