Roof Pitch Angle Building Regs

Pitch roof this is where tiles or slates are used and a void is usually created underneath.

Roof pitch angle building regs.

Flat roof drainage. But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof. To help stop the rain going under the tiles you would increase the headlap of the tile to 100mm 75mm is standard it s also worth bearing in mind that the pitch angle of the roof tiles will be a couple of degrees less than the pitch of the rafters in the case of the marley wessex i think it s about 3 degrees less. To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.

Modern tiles permit shallow pitch but some of the older traditional coverings such as hand made clay tiles require quite steep slopes to ensure rain does not penetrate the roof covering. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. Yet another technique is to add sprockets. Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.

It may also be influenced by the nature of the roof covering. A correctly build flat roof will drain the rainwater quickly and effectively into the gutters without allowing water to collect in depressions and pond on the surface of the roof leading to the build up of silt deposits on the roof and stresses in the membrane when the water freezes a small amount of ponding is inevitable and it should not reduce the. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. Roof pitch and corresponding angles.

Minimum roof pitch for shingles. If a thatched roof is constructed with gables without hips valleys or dormer windows it must have a pitch of 45 degrees and a clear span that is no more than 6 m. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. Squaring building lines example the picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. That way you end up with a catslide a roof with one side longer than the other continuing at the same pitch over the two sides of the building. Spacing must be done according to sans 10407.