Maximum Roof Pitch Building Regulations

One ply of smooth roll roofing complying with astm d 6380 and at least 36 inches wide or valley lining as described in items 1 and 2.

Maximum roof pitch building regulations. It may also be influenced by the nature of the roof covering. Asphalt shingles continue to be the most widely installed roof covering option in north america. Thatch is used occasionally on new dwellings and demands a roof pitch of at least 45 and more likely 50 to allow the rain to flow off quickly and prevent ingress. Pitch roof this is where tiles or slates are used and a void is usually created underneath.

Let us recap on the minimum roof pitch required for each type of roofing material. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including. For example some epdm membrane assemblies have maximum roof slope limitations as low as 1 2 12.

The angle of the pitch may be dictated by aesthetic or structural factors. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs. The bottom must be 18 inches and the top layer a minimum of 36 inches wide. Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.

Asphalt shingles require a minimum roof pitch of 2 12 or greater. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. These factors include the pitch of the roof the type of slate being used the size of the lap the size of the slate as well as the site s exposure rating. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. This steep pitch is also an essential ingredient of cottage style. The international code council icc is a non profit organization dedicated to developing model codes and standards used in the design build and compliance process. For closed valleys valley covered with shingles.

Talk in terms of pitches and you will always be understood in the roofing universe.