When installing or repairing a flat roof you must adhere to building regulations.
Recovering flat roof building regulations.
There must be a slope of 1 80.
Recovering roofs the changes to approved document l coming into effect 6thapril 2006 the building regulations were amended to accommodate the renovation of a thermal element this would include.
The performance of the new covering will be significantly different to that of the existing covering in the event of a fire.
Iirc its 25 of the complete building roof.
Section 1510 3 recovering versus re reroofing 2010 placement explains the specific requirements where roof system re covering is not appro.
Another factor influencing whether or not a recover project is feasible is establishing how many roof systems or layers are currently in place which requires making inspection openings.
For further information contact the building regulations division.
Most modern building codes allow a maximum of two non ballasted roof systems on a structure mostly due to the weight associated with the roofing materials.
So if your flat roof is a small extension to your house ie 25 of the total roof area you should be ok to carry out the work however given you re.
Tion loads indicates a building s roof struc ture needs to be capable of supporting the roof system plus equipment loads and the weight of stored material on the rooftop dur ing roofing operations.
You will need approval however if.
Although each roof must be evaluated individually general guidelines can help make an informed decision whether to replace or recover an existing asphalt shingle 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 lighter than the existing and also meets requirements in respect of fire safety and energy efficiency see above.
If you want to carry out repairs on or re cover less than 25 per cent of the area of a pitch or flat roof you will not normally need to submit a building regulations application.
Roof needs to achieve an external fire rating vapour barriers should be used flat roofs should be anchored to walls to prevent uplift flat roofs should be laid to falls flat roofs require regular maintenance.
Part h of the building regulations regarding drainage state that water should drain to one or two edges.
If a roof has only one layer of shingles that lay flat and the decking is in good condition a tear off may not be needed.
