Leaking Felt roofs: Insurance and Heat Processes

When faced with a leaking felt roof the first reaction may be to be attempt to remove the old failing felt sheeting. There are two reasons why this may be both unwise and expensive.

1) Disturbance and Unforeseen Consequences

If a roof covering has failed there may well be consequential damage to the underlying substrates such as the roof boarding, batons, purlins etc.

This may not in itself be serious enough to make the roof structure unsustainable but the uplifting of the overlying felt may cause breakage of joints or laths which then will need to be repaired. In turn their removal, in order to effect repairs, may demand yet further repairs. The cost and time spent can easily spiral out of control.

You can avoid these difficulties by applying Rubba Roof compounds DIRECTLY on to existing roofing – felt. . Rubba Roof has very high adhesion to roofing felt and it will form a 100 % waterproof , flexible coating ….just like sheet of rubber . Cracks, upstands and other detailing are easily resolved using the Rubba Roof Reinforcing Fleece.

2) Costs of Disposal

Roofing felts contain bitumen and so many Local Authorities regard the materials as “Hazardous Waste”; therefore quite onerous and costly stipulations and charges may apply to their disposal.

By using Rubba-Roof to seal and waterproof leaking felt roofs ,the costs and inconvenience associated with the removal and subsequent disposal of old roofing – felt may be entirely avoided.

The two most common methods of applying Roofing Felt on to roof areas both involve the use of heat at temperatures in excess of 170 degrees celsius.

In the case of Pour and Roll the requirement is a hot, bubbling mat of bitumen and in the case of Torch-On materials an open flame gas torch is used to heat the bitumenised backing on the roofing felt membranes.

Many building Insurance policies now exclude the use of “hot processes” being used on the fabric of buildings. In other words, they will not pay out on claims for loss or damage where “hot process” has been involved.

Because Rubba-Roof systems are cold applied they can be used with confidence on all types of roofs, whether domestic or commercial without contravening any insurance stipulations in respect of the use of flame or hot processes.

Lifespan of roofing Felt compared to Polyurethane Materials

As discussed, roofing felts are subject to cracking, blistering and loss of effective waterproofing performance through various climatic and mechanical agencies.

The action of Ultra Violet (U.V.) radiation can degrade the cohesion of the bitumastic matrix and cycles of heat and cold may cause the roofing felt to crack.

Mechanical stresses due to movement within the roof structure and supporting components may cause failure of roofing felts by the disruption of the integrity of the adhesion of the felts backing to the roof substrate, or even to to the cohesion twixt the carrier layer and the top layer of the roofing felt material.

The loss of the volatile oils in the bitumens that are incorporated in the surface of roofing felts can also have a significant effect upon the life span of all roofing felts, as these oils are lost from the surface of the felt the sheeting becomes more brittle and less able to withstand movement and flexion.

Rubba-Roof compounds are composed of complex polyurethanes and contain NO BITUMEN.

Polyurethanes have superb elasticity and can accept almost infinite episodes of expansion and contraction without losing their adhesion and waterproofing properties. So Rubba-Roof membranes provide assured, 100% waterproof coatings for the treatment of flat and low-pitched roofs, both old and new.

Rubba-Roof is easy to apply, saves time,
saves money & lasts longer!



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