How To Measure Your Roof Size

Measure the pitch of your roof in the attic.

How to measure your roof size.

Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. The easiest way to measure this section is to divide it up into three different sections. As you can see s1 and s3 are the same size but you still need to document all measurement points to verify your material calculation accuracy. Flat roofs if your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width.

Don t use this as your only method of measuring. Mark a length of 1 foot 0 30 m on a long level starting from one end. Since s2 is now a rectangle simple l x w is all that is required. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.

It is often compared to slope but is not exactly the same. How to calculate your roof square footage. First measure the length and width of each surface on the roof then multiply these values to get the square footage of that surface. Make sure to document the number of chimneys.

Start your free trial. Hold the end you measured from against the bottom of a rafter so it s sticking straight out horizontally and is level. Just use it as a starting point and you ll have a fairly basic idea of what you re dealing. Things you will need steel tape measure.

Use the step by step guide below to accurately measure your roof and estimate roofing costs. Multiply the number of roofing squares for a medium pitch roof by 1 12 to 1 25 or by 1 3 to 1 42 for a high pitch roof to get the square roof area. S1 s2 and s3. To measure a roof start by measuring the length and width of the building s exterior walls and multiplying them to get the area.

Then calculate the pitch of the roof by placing a level against it angling the level so the bubble is centered and measuring the distance between the end of the level and the roof. Roof and won t have much effect.