![]() ![]() Standard industry roof rafter spacing in inches are 12”, 16”, 19.2”, and 24” on-center, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. Sometimes even the old timers needs a refresher course.The typical on-center spacing, according to the International Residential Building Code (IRC), is 12”, 16”, 19.2”, and 24”, which means the actual space between the rafters is 10.5”, 14.5”, 17.7”, and 22.5”. ![]() So from one Lover of wood and dimension s to another, i do applaud you, Thank You so much for my findings on your page.Ĭause even I still have questions about things and I’ve been doing this for a while now. Your page needs to be on top of the others when a person does a search cause then they wouldn’t have to search any futher than the readings and calculations of each dimensional questions they may have then on your page. So kudos and glasses raised as i say Cheers to you sir for a wonderful informational site. Your knowledge exceeds anything that I have came across, expecially since the start of the search engines on the web, in all of my 30 years of doing construction.įinally someone with great understanding and someone with Heart in this industrial business that we call contractors, architects, designers etc. It is easily understood even for the everyday person that doesnt do this work for a living. You have done an amazing job with this page as for, design, info on each and explanation (break down) of the mentioned diagram(s). So for me, stickly from my own experiences, readings and searches, to comment on your site here goes way beyond and out of my norm. And most websites/blogs dont really explain things in retro form for my liking or to the question I’m searching on. I dont typically ask questions about things outside of the social box unless it’s an experienced family member or family friend of the same experience, ie 3rd or 4th generation contractors even still they all have their own Lengo and experienced definition of this and that. This isn’t a question but it is a compliment to you and your informative site. Sizes are NOMINAL, which means that a 2×8 is actually 1.75″ x 7.25″ board. These are “retail” prices and if you have an account and are working with an outside sales person, you can typically get 3-7% discount. Prices below were sourced from National Lumber in Newton, MA. There is no “board price”, meaning that a 24′ 2×10″ board will cost the same per foot as 32′ 2×10″ board. LVL prices are calculated PER foot PER size. The calculator will automatically switch your board from PINE to LVL when you exceed 20 feet long threshold on rafter length. If you need longer LVL, they can be custom ordered. LVLs come in 24′, 28′, 30′ and 32′ standard lengths. LVL is VERY expensive, but solves the limitation of 20 feet, in a common pine board. If you need rafters that are 20′ 1″ or longer, you will need an LVL (Laminated Veneer Lumber) engineered rafter board, which is this yellow color plywood-like board made for structural purposes. Rafters LONGER than 20 feet: Home improvement stores DO NOT sell pine boards longer than 20 feet. Lumber size/ width (2×8″, 2×10″ or 2×12″ boards) will be used to estimate cost of each rafter, as well as total cost (excluding local sales tax). Rafter spacing (and roof length) will be used to determine quantity of rafters needed for your project. If your roof pitch is in degrees, use our roof pitch calculator to convert degrees to “pitch” value. Example: If your roof rises 5″ for every 12″ of run, enter 5 as roof pitch. Enter desired overhang length – this will affect your rafter length and lumber needed for the job.ģ) Enter roof pitch / slope: Roof pitch is the value of roof rise over roof run, using 12 as the base for roof run. Width or Span is the gable side of the roof, which is used in calculating rafter length and cost.Ģ) Enter overhang length: Most houses have overhangs (soffits) which are needed to protect the house exterior walls and foundation from water run-off from the roof. Use the diagram on the right to correctly enter your roof dimensions – this will help you calculate board length more accurately.ġ) Enter house footprint: Length is the roof eave ( gutter) side. Standing Seam Materials & Cost Calculator. ![]()
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