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Roofing (Flat Roofing Defects (Faulty installation (Air blisters, Water…
Roofing
Flat Roofing Defects
Blocked rainwater outlets
Lack of maintenance / previous quality repair work
Damage from other trades / maintenance contractors
Faulty installation
Air blisters
Water blisters
Incorrect detailing
Mastic Asphalt Roof
Hot mixed on site
No seams
Hard wearing
Expensive
30+ year life expectancy
Bitumen Felt
Modern membranes applied with low heat and no flame
Visible seams / laps - usually come in 1m rolls
30+ year life expectancy
Granular mineral finish
Easy to repair and install
Pitched Roofing Defects
Tiles can degrade and become porous
Failing mortar - leading to water ingress
Perishing felt underlay
Rusting of nails on slate roofs
Liquid coating
Seamless appearance
Good for roofs with multiple protrusions or plant on roof
Hardwearing non slip finish can be incorporated
Has to be applied when watertight
e.g. a layer of felt may need to be applied first