frequently asked questions

A1.

What is the life expectancy of roofing felt for a flat roof?
Based on industrial estimates, life expectancy ranges from 5 years to 30 years dependent on the product used. Each manufacturer provides a product guarantee, which should be used as a guide to longevity.   
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A2.

Do flat felted roofs need to be covered with chippings?
Chippings do provide protection for the roof from ultra violet radiation as well as providing a decorative finish. They also can reduce problems caused by extremes of temperature.
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A3.

Can liquid roof waterproofing systems be used in areas likely to be walked on?
It is not advisable to subject brush-applied waterproofing to anything more than light traffic associated with maintenance work. Areas used regularly for access should be afforded suitable protection.
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A4.

Do you stock a product that I can paint over my existing flat roof to stop it leaking?
There are a number of brush-applied, liquid roof coatings available through your local branch, which provide waterproof protection to most conventional roofing surfaces. Contact your local branch for further details.
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A5.

What advantages are there from using a VELUX roof window over a dormer window?
A VELUX roof window can generally provide up to 40% more light than a dormer, as it is installed at a pitch of 45^o. It can also be up to 70% cheaper. A VELUX roof window also provides a good overall outlook while dormers restrict both the upward and side view.
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A6.

I have noticed condensation in my roof space - how can I prevent this?
The only practical way to prevent condensation is through effective ventilation. By promoting cross currents of air, the entire roof void will be kept well ventilated and will disperse any water vapour before it can condense. Contact your local branch who will be able to advise you of the most suitable product.
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A7.

Do I need special nails or screws when fixing lead?
Yes - use copper, brass or stainless steel nails or screws.
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A8.

Should I use a special sealant for lead?
Yes - a lead sheet sealant is specifically designed for pointing joints between lead and brickwork or masonry. It also provides a long-term, flexible joint, which can absorb temperature changes.
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A9.

What gradient do I need to lay guttering ?
A domestic eaves gutter when fixed on rafter brackets should be laid to a fall of not greater than 1:350 to allow for settlement.If there is too steep a fall, an excessive gap would be created between the lowest edge of the roof and the top of the gutter.
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A10.

Is it possible to still purchase Asbestos Sheeting?
No - but we stock other profiles that are non-asbestos: Profile 3 is used for sheds and garages; Profile 6 is used for agricultural and industrial applications; and Profile 4 (or Trafford Tile) is used for remedial and refurbishment work. It is also possible to find replacements for deep profile industrial sheets.
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