Summary of flat roof building regulations.
Roof pitch regulations uk.
These are also reflected in hsg 33 health and safety in roof work from the hse.
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.
Importance of a roof pitch.
Roof pitch refers to the slope which the rafter creates.
As a result the tiles must be able to cope particularly at the lower end of the slope with the greater expected volume of water and lower speed of water movement.
The angle of the pitch may be dictated by aesthetic or structural factors.
If you are replacing more than 25 of the roofing area then you will also need to replace the thermal insulation.
The lower the pitch the greater the amount of water that the roof slope will collect and discharge.
Depending on where you live in the uk snowfall must also sometimes be considered in determining the gradient of the fall.
The pitch of your roof will not just have an effect on the way the house looks.
Flat roof this usually consists of felting which has a slight fall to allow rain water to drain off.
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.
What is the standard pitch for a roof.
The chief reason for having a roof pitch is to redirect water and snow away from the roof and avoid any percolation that might result from stagnation of water on the roof.
If the existing roof covering is to be replaced with a different material to its original for example slate to tiles then approval under the building regulations is likely to be needed to ensure the roof will be adequate in terms of structural stability applicable where the replacement tile will be significantly heavier or.
It may also be influenced by the nature of the roof covering.
There is no standard universal roof pitch roof pitch varies depending on culture climate style and available materials in the usa the range of standard pitches is anywhere between 4 12 and 9 12 in the uk the typical house has a pitch between 40 50 although 45 should be avoided.
To enable compliance with the requirements of the building regulations to be demonstrated full details of the new roof will be needed including.
Contemporary houses often have flat roofs which shouldn.
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.
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.
Again the minimum standard is that bs 5534 must be met and construction design and management cdm regulations now apply to domestic re roofing which put health and safety obligations on the contractor.
