How To Find Roof Pitch With Framing Square

How to find roof slope rafter length on a framing square how would we use our framing square to measure or to calculate the slope and rafter lengths of this historic herefordshire u k.

How to find roof pitch with framing square.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Find the unit rise say inches per foot of the roof on the top line in the framing square rafter table e g. It affects walkability as well as drainage and roofs in areas of high rain or snowfall tend to have steeper pitches. The triangle shaped square was invented in 1925 by albert swanson to provide a quick accurate method for marking rafters.

Because of its compact size it is frequently used as a saw guide when cutting framing members as well as a layout tool for quick 45 and 90 degree cuts. To accurately calculate the area of your roof you must first determine its slope or pitch. Fix stair gauges on the framing square to mark the pitch. Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.

Square guides are available at most hardware and home improvement centers. Finding the pitch of a roof is simple with a speed square. Framing square guides are small inexpensive metal attachments to the framing square that are locked in position on the square s edges at the pitch and run dimensions to define the roof angle and make the repeated marking of the rafters much more efficient. Roof pitch affects the actual area of the roof.

This will the first point of the rafter measurement line using the results of your rafter length calculation measure from this point along the rafter measurement. A carpenter s framing square includes some tables stamped right into the tool itself. How roof pitch is calculated. This article explains how to make quick use of a framing square and its imprinted data to get some basic roof measurement data like roof pitch or slope rafter lengths and end cuts.

So if the pitch of your roof is 7 12 place one stair gauge on the vertical part of the framing square the tongue at the 7 inches 18 cm mark and place one stair gauge on the horizontal part of the framing square the body at the 12 inches 30 cm mark. From one end of the rafter material using a speed square or framing square mark an x in 12 angle on the rafter and cut it measure down y height from the long point of the rafter cut and make a mark. Roof framing rafter layout.