How Do You Pitch A Flat Roof

How to make a flat roof have a pitch general steps step 1.

How do you pitch a flat roof.

Some will choose to keep their pre existing flat roof on their structure underneath the new pitched roof to save removal costs but others might not be able to consider that option. Rafter rise run from the pythagorean theorem. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Determine the roof span and pitch.

Roof pitch refers to the slope which the rafter creates. How to calculate roof pitch. A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

However flat roofs require much more aggressive and consistent maintenance than a pitched roof. Minimum pitch for metal roof the minimum roof slope for metal roofs is dependent upon the roof profile. Various styles of a pitched roof can be built or you can purchase pre manufactured trusses. Rise run pitch where pitch is expressed in percent.

You will need to ensure that you are in standards with your local building codes and have the permits required. The flat roof already has a slight pitch as it is required by law. Tear off the old materials and apply roof sheathing. 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.

The process for converting a flat roof into a pitched roof depends on your individual structure and your individual needs there is no one size fits all option. The way pitch also known as roof slope is measured is rise over run. Depending on the climate your flat roof will only last between 15 and 30 years if well maintained. Flat roofs also don t last as long.

With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Install the new material. So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12.