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.
Minimum roof pitch uk building regs.
Flat roof drainage.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
This will inevitably result in fixing calculations being required and complied with for all roofing projects covered by building regulations.
Minimum roof slope roof pitch r905 3 2.
The function of a roof is to protect the building below from the weather.
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.
In accordance with the guidance in bs 8000 part 6 which in turn direct users to the wind uplift calculations in bs 5534.
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 current trend is for a warm roof where insulation is installed between the rafters thereby keeping the roof timbers warm.
How to insulate a roof.
If it s going to be used infrequently for maintenance only the requirements will differ from a skylight meant to provide regular rooftop access.
35 is considered to be the minimum for slate and clay but if you do need to go below this interlocking concrete tiles are the best option.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
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.
With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 200 for slate roofs.
In addition roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties.
This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.
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.
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.
It also requires that roof coverings are fixed correctly.
Pitch roof this is where tiles or slates are used and a void is usually created underneath.
The first decision is whether to insulate a pitched roof at ceiling or rafter level.
Choosing the right pitch.
