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What is the minimum slope required in the installation of shingles?
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Generally, the minimum slope for application of shingles is 18 degree with one layer of felt underlayment. For slopes lower than 18 degree, low slope application (two layers of felt underlayment) should apply.

     
  : What types of decking materials do you recommend for the application of asphalt shingles?
: Suitable deck types are waterproof plywood (shuttering board, min 12 mm) or wood sheathing boards (well-seasoned tongue-and-groove or plank, min 20 mm).
     
  : Why is proper ventilation of the attic area important? What is proper ventilation?
: Lack of proper ventilation will cause premature failure of the roof. The minimum specification is one square foot of net free ventilation for every 150 square feet of attic flow space.
     
  : What benefits and advantages do I get from using fiberglass asphalt shingles?
: . Long lasting beauty
. Light weight
. 100% watertight (if applied according to manufacturer's specifications)
. Burglar proof
. Flexible
. Algae resistant
. Product performance warranty
. Technical support and back up services
     
  : Can shingles be applied on curved roof?
: Yes. It is possible to install shingles on curved roof as long as roof structure and wood sheathing board can form the curve.
     
  : Who can I get to install shingles?
: All Build is equipped with the skills and resources to undertake the supply and installation of shingles through our wholly owned subsidiary - AB roofing systems sdn bhd , backed by technical support from Owens Corning.
     
  : How long does it take to install shingles on a 500-sqm roof?
: Generally, it should take about fourteen working days to complete shingles installation for a 500-sqm roof. However, longer time maybe required if the roof design is complicated or the pitch is more than 45 degree.
     
  : How long does it take to order shingles?
: Because it is an imported product, it requires about 16 weeks to be shipped in from the US. However, we do keep stocks of favorable colors and range in our warehouse.
     
  : Where can I obtain my International Performance Warranty?
: We are authorized by the manufacturer (Owens Corning) to issue Product Performance Warranty*.