**UKworkshop.co.uk Common rafter work out General**

Using the CM calc 10â€² run 10â€³ pitch, you end up with a common rafter length of 13â€²-0 3/16â€³; this gives the total length from center of the building to the wall line. Now we have compensate for a 2x ridge board which is 1 1/2â€³ half of that is 3/4â€³, if we just take 3/4â€³ off the mathematical length we end up 12â€²- 11 7/16â€³.... 29/12/2012Â Â· How do we work out rafter lengths. How do we work out the rafter lengths ? Well we have a couple of ways, we could buy a rafter table book â€“ expensive, can be complicated. We can use pythagoras theory, which would be the run squared + the rise squared find square root which i would recomend for major roofs , in our example porch roof it would be 24 squared = 576 + 20 squared = â€¦

**Hip & Valley Roof Framing Example # 1 Blogger**

Multiply 10(run) by 13(bridge length of a 5/12) and you have the rafter length in inches. On a framing square which has the rafter tables, the first line, "Length of common rafter per foot of run", gives you the bridge length for the most common pitches.... Multiply 10(run) by 13(bridge length of a 5/12) and you have the rafter length in inches. On a framing square which has the rafter tables, the first line, "Length of common rafter per foot of run", gives you the bridge length for the most common pitches.

**Determining Rafter Length By Rise and Run by RonInOhio**

Multiply 10(run) by 13(bridge length of a 5/12) and you have the rafter length in inches. On a framing square which has the rafter tables, the first line, "Length of common rafter per foot of run", gives you the bridge length for the most common pitches.... 14400" + 20736" = 35136" The square root of which = 187.446" (your rafter length in inches) Step 2 -Lay out your Rafter Align your framing square so the 10" mark and 12" mark meet the edge of your rafter â€¦

**Ridge Height Calculator timbertoolbox.com**

The length of the first jack rafter will be calculated from the building corner with the jack rafter spacing. If you enter a jack rafter spacing of 24" and 1.5" for the jack rafter width, then the length of the first jack rafter will be calculated from a wall run of (24" + 1/2 of the jack rafter â€¦... Yep your calculations are indeed correct. Hypotenuse (rafter length) is coming out at 782.43. So you can't be far now from cracking it. I would probably now double check the instrument you used to transfer the angle measurement from drawing to rafter, I used a sliding bevel.

## How To Work Out Rafter Length

### How Do You Do the Birdsmouth Cut for a Rafter

- rafter book page 1 - Empire Level
- Hip & Valley Roof Framing Example # 1 Blogger
- Roof Calculator Â» Rafter Length Calculator APB Pole Barns
- How to Build a Bay Roof â€“ Build It

## How To Work Out Rafter Length

### 29/12/2012Â Â· How do we work out rafter lengths. How do we work out the rafter lengths ? Well we have a couple of ways, we could buy a rafter table book â€“ expensive, can be complicated. We can use pythagoras theory, which would be the run squared + the rise squared find square root which i would recomend for major roofs , in our example porch roof it would be 24 squared = 576 + 20 squared = â€¦

- By measuring the length and width of each rectangular part of the building, and using the natural secants figure for the rafter pitch, all three can be multiplied together and the answer will give the total roof area. A hipped roof will have the same roof surface area as a mono pitch, or duo pitch (gable to gable), for the same building footprint.
- Yep your calculations are indeed correct. Hypotenuse (rafter length) is coming out at 782.43. So you can't be far now from cracking it. I would probably now double check the instrument you used to transfer the angle measurement from drawing to rafter, I used a sliding bevel.
- Title: rafter book - page 1 Created Date: 2/24/2012 4:45:28 PM
- Yep your calculations are indeed correct. Hypotenuse (rafter length) is coming out at 782.43. So you can't be far now from cracking it. I would probably now double check the instrument you used to transfer the angle measurement from drawing to rafter, I used a sliding bevel.

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