for Douglas Fir-Larch #2 or Southern Pine #2 for 10 Lb. Just basically need to know if my spacing should be 12, 16 or 24 inches.Ī 2x4 roof rafter span is limited to 10'10' with 12' on-center spacing. Again I would prefer to use 2×4’s but can go with 2×6’s if I can’t get away with 2×4’s. I plan on putting on a metal roof so just furring strips + 28 ga metal for live load weight. My building will be 24ft wide with each rafter side being 17′ 6″ long if I calculated it correctly based on a 10/12 pitch with an 18″ overhang. So it would be the standard KD WW that the big box stores carry. I would like to frame with 2×4’s now that the price of lumber has come back down. Being in the southern part and based off recent history I would lean more towards the 15. First I live in south central Kansas so my snow load is 15 – 25 psf. Here are some of my details that I hope someone can help me figure out what i need. They still have the one by furring + decking + asphalt shingles and it doesn’t seem to budge an inch when is snows because it doesn’t hold much snow with that pitch.

Our home roof is 2×4 (probably SYP) that is spaced at 24″ or more. I am wanting to put up a carraige house to match our Victorian home that has a 12/12 pitch roof(s). I don’t want to under build nor do I want to overbuild. I can’t help but think that the requirements would be different for a 10/12 or 12/12 pitch roof. I know there are a ton of rafter span calculators online that either give you info for under 3/12 pitch or over 3/12 pitch. I did a quick search on here but coulnd’t find a thread that fit my situation.

Rafter spacing for metal roof