How To Build Sloped Roof 1 4 Over 12

A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.

How to build sloped roof 1 4 over 12. The rafters on a steeply sloped roof for instance will be much longer and have more end cuts than those on a flat roof. This will give you the rise over run or pitch. It has a greater slope. For example if you measure 4 inches the pitch of your roof is 4 12.

The pitch of a roof is the rise the vertical angle of the roof over the run the horizontal measurement. Pitch ratios range from 2 12 to 12 12. Basically a slanted roof style is a flat roof tilted high up at one edge to create a very steep slope. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

A low pitched roof would be 2 12 and it means that over the space of 12 inches the roof only rises two inches. It s similar to a shed or lean to roof or a clerestory roof but has one visible difference. For those who have a flat roof and are concerned about leaking and rotting building a sloped roof over the flat roof is an option. Thus a 4 12 pitch would be a 33 slope.

Once you ve determined the measurements you need mark them directly onto a series of 2 in 5 1 cm x 4 in 10 cm or 2 in 5 1 cm x 6 in 15 cm boards using a carpenter s pencil. You can also divide the rise over run multiply by 100 and get a percentage. A 4 12 pitch is around 18 5 degrees but not exactly.