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. Number and Length of Rafter and Collar ties - Computes the number and length of rafter ties and collar ties based on roof dimensions and spacing.I did a quick search on here but coulnd’t find a thread that fit my situation.Number and Length of Rafters - Computes the number and length of rafter boards based on roof dimensions and spacing.Number and Length of Purlins for a Roof - Computes the number of purlins for a roof based on dimensions and spacing.Screws for a Metal Roof - Computes the number of screws needed for a metal roof.Number and Length of Metal Roof Panels - Computes the length and number of metal panels and trim pieces for a metal roof.Roofing nails needed for a roof - Calculates the number of roofing nails needed for a roof in normal and high wind conditions.Shingles needed for a roof - Calculates the number of standard bundles (33.3 ft 2) of shingles for a roof.4x8s needed for a roof - Calculates the number of 4x8 sheets needed to cover a roof.Number of Trusses Needed for a Roof - number of trusses needed based on the roof width and the truss spacing.26.6 o : 6/12) based on the length of the rise and run. Pitch of a Roof - Computes angle of incline in the roof in both degrees and rise over 12" run (e.g.It also returns the number of 4x8 sheets to cover the roof, the number of standard bundles of shingles to cover, and the number of roofing nails for both normal and high wind environments. Area of a Roof - Computes the area of a roof based on the pitch and the dimensions of the area covered by the roof.Metal for a Roof - Calculates the number of metal panels for a roof.This algorithm puts the collar tie two feet below the ridge, but only if the ridge is 48" above the rafter ties. The collar tie length is a function of the pitch of the roof and the position of the collar tie. Note: some builder use a collar tie on every other rafter. Collar ties are suggested for roofs with a rise greater than forty eight inches (48"). Rafter ties or Ceiling Joists keep the rafter boards from kicking out under the downward load on the roof. Collar ties are included when the total rise is above 48".Consult your local codes for the required material specifications. The choice of rafter boards is 2x4 for rafters shorter than six feet (6'), 2圆s for rafters between 6 feet and 10 feet, and 2x8s for up to 16 foot long rafters.The length of the Ridge is the length of the ridge plate.The rules in this calculator are as follows:
Rafter span calculator professional#
In all cases, confirm your estimates with a professional estimate and adhering to local building codes. The Roof Rafter calculator is meant to help with material estimates. Rafter Boards (RB): The calculator computes the following rafter framing materials: ( oC) On-center rafter spacing (default: 24").INSTRUCTIONS: Choose units and enter the following: It also returns the length of the ridge board, and the length and number of rafter ties and collar ties. The Roof Rafter Count calculator computes the total number of rafter boards (roof joists) for a gabled roof based on the ridge length, pitch and span.
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