Deciding on the correct roof pitch for your home very much depends on the style of house you are building or renovating and to a lesser extent your local area.
Minimum roof pitch uk building regs.
Minimum roof pitch for shingles.
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.
If it s going to be used infrequently for maintenance only the requirements will differ from a skylight meant to provide regular rooftop access.
This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
The first decision is whether to insulate a pitched roof at ceiling or rafter level.
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.
In accordance with the guidance in bs 8000 part 6 which in turn direct users to the wind uplift calculations in bs 5534.
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.
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 enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.
The justification for roof access informs which aspects of the building regulations apply and which safety measures you should employ.
The function of a roof is to protect the building below from the weather.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
This will inevitably result in fixing calculations being required and complied with for all roofing projects covered by building regulations.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
Minimum roof slope roof pitch r905 3 2.
How to insulate a roof.
Choosing the right pitch.
In order to satisfactorily fulfil this function over a period of years it must be strong stable and durable.
Flat roof drainage.
