What is mineral felt roofing?
Mineral felt roofing can also be known as:
– Torch on felt, torch on flat roofing, hot mop, three layer felt, pour and roll felting and hot bitumen flat roof.
All of these terms are used to describe mineral felt roofing.
Torch on felt has taken over the flat roofing market at this time because of its easy installation method and its vast choice of colours. It is also far more durable and longer lasting than traditional roofing felts used previously.
The felt is also highly tensile and some felt manufacturers now offer a 20 year guarantee on these products.
The only problem is that many companies will guarantee the labour aspect for that length of time. Also, due to torch on felt being so widely available, it’s no secret that some merchants do not stock the high quality, high tensile torch on felt. You may end up buying something that is inferior to the high quality product simply because they don’t stock it.
If you’re looking for more out of your flat roof, why not take a look at our long-lasting EPDM rubber roof that comes with a 20 year guarantee and a life span of up to 50 years.
Ponding and torch on felt
Ponding occurs when the roof has insufficient fall on it for the rainwater to drain away properly which results in a pooling of stagnant water once the rain has stopped. This problem occurs with many old flat roofs and many torch on felt flat roofs.
The pressure from the weight of the water can push the water into tiny cracks or weak points in the roof. In turn, this will cause problems with the timber structure in your roof and will shorten the lifespan of your flat roof greatly.
Another problem with torch on felt and ponding is when the ponding water freezes and expands which causes the felt to crack and blister resulting in water damage to your internal structures.