Pitched Roof Rafter

The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size.

Pitched roof rafter.

For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. In this case we would suggest fitting kooltherm k7 pitched roof board between the rafters and kooltherm k118 insulated plasterboard to the inside face of the rafters.

Roof pitch is simply the slope created by the rafter. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

It is the length of this portion of the rafter. The rafter member will be longer. To cut roof rafters start by fixing the stair gauges on your framing square to the dimensions of your pitch. Usually this construction is a ventilated roof which will have sarking felt.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. If you plan to have overhang etc. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Cold pitched roof.

Roof pitch refers to the slope which the rafter creates. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.