Tuesday, 28 February 2017

Rymans Store Camberley Mall

Tradecall Roofing Camberley 01276 501755


Todays Felt Roofs Last

This type of flat roof still has a bad reputation with some people, but I’m going to tell you why that perception is out of date. Most people have in mind the old ‘pour and roll’ felts of yesteryear, and these were thin bitumen felts glued together with a hot liquid bitumen between each layer. They had minimum internal reinforcing, with some containing natural hessian fibres which were prone to rotting. This type of felt, sometimes known as rag fibre ,would effectively dry out and crack with age or UV damage from the sun. 10 years was pretty much the life expectancy.

Modern torch on felt roof

Torch on felt roofing, in case you hadn’t guessed describes the method of application. Do not confuse these modern roofing felts with the older pour and roll system. Great strides continue to be made in bitumen and modified bitumen technology such as SBS or APP, resulting in much better resistance to UV damage and cracking.  This type of felt roof comes on rolls and is laid with the aid of a very large blow torch that heats and melts the rear of the felt, melting it onto the roof structure below. Typically it’s applied as a 3 layer system usually consisting of a perforated underlay, a 2mmor 4mm underlay layer, then thick 4-5mm felt. These layers are all laid in a half lap manner, so all the joints are the furthest away they can be from another joint.
The thickest top layer is often a coloured mineral finish known as a cap sheet, and they are available in a variety of colours, as well as a plain felt finished with a silver solar reflective UV finish. All of these felt layers are also reinforced with strong polyester weave sandwiched in the middle of the felt, giving them incredible strength. In lifespan terms, I don’t know a single roofer that will not be happy to guarantee 10 years, because they know it will last 20, sometimes 30+.  Not as bad as you thought is it?

Dry Fix Verge Bagshot Surrey

Over the years, manufacturers have developed systems that do away with the need for mortar. These systems, commonly known as 'dry-fix' roofing systems, offer a number of advantages over cement mortar:

1. Remove the need for regular maintenance of the roof. Over time, mortar can succumb to frost damage and building movement. When this occurs, repairs can be quite costly as scaffold access is often required. By eliminating mortar from the roof you can virtually eliminate any such maintenance.
2. Allows the natural movement within a roof structure to take place without damaging the ridge and hip fixings.
3. Provide the means to 'mechanically' fix ridges and hip tiles, greatly reducing the risk of storm damage.
4. Provide discreet roof space ventilation at the ridge and hip which helps control harmful condensation in the roof space.
5. Allows the roofer to complete the work safe in the knowledge that rain will not cause mortar to stain the roof or frost to damage the mortar before it has had chance to properly set.

Dry Fix Verge
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Wednesday, 22 February 2017

EPDM Failure

Another failed EPDM installation
Distributors of epdm need to train installers better, this roof was laid by a so called roofer who had had 1 days training received his certificate and was then let loose on a roof with work like this, the week before he was a milkman no experience as a roofer ever.
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