Rafter Pro Roof Layout Square

The roof rafters provide integral structural support to the roof.

Rafter pro roof layout square.

If the lumber is not straight always put the high or crown side up. To lay out a common rafter you need the pitch of the roof expressed in units of rise per foot of run in the gable roof example shown here a rafter with 6 in 12 pitch rises 6 in. More they usually claim that 4 12 is the lowest you can go without any special underlayment. Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through.

For every foot. See rafter run to outer wall calculator below. Use this calculator to find your rafter length. Align the back edge of the tongue with the 187 7 8 mark.

Laying out hip valley and jack rafters takes experience and skill but if you re building a simple gable or shed roof all you need is the common rafter the basic building block of roof framing. Half building width minus 1 2 ridge thickness. Place the square as before aligning the 6 mark of the tongue and 12 mark of the body with the top edge of the rafter material. Allow for ridge thickness when determining rafter run to outer wall.

The rafter square is designed to take advantage of the geometric laws of the right triangle. The angle at which the. Starting at the pivot point. Draw a line down the edge of the tongue as shown in illustration b of the roof layout.

Pivot the layout square so that the number 7 on the common scale lines up with the edge of the rafter. Common rafters are the most common type of rafter in construction. Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter. Today we are tackling a big beginner lesson which is common rafter layout and cutting.

Learn the 1 rafter design that will guarantee your roof that is safe and strong for years to come. First you ll want to find the pitch of your rafters which will help you find the length of your rafters. If you re framing a gable roof on a new house or building a shed or even a doghouse with a gable roof you ll need to cut a number of roof rafters. The rafter square or speed square does more than mark perpendicular lines.

Common rafter layout 1. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Many conventional roofing products such as shingles mandate a slope no lower than 2 12. Here s how to make sense of all the numbers on your square and get the most out of this tool.