Residential Flat Roof Detail

It must provide adequate protection against the elements keeping the buildings structure and interior dry.

Residential flat roof detail. And their horizontal lines abound in the west and in urban areas. A flat roof must be strong durable and stable throughout its lifetime. In the warm flat roof construction there is insulation packed into every possible space where air can flow. But flat roofs take a pounding from harsh weather which is why they rarely last as long as a good sloped roof.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Just enough slope to drain water but also flat enough to be a problem if not constructed properly. A classic flat roof is either almost completely level or has a very slight pitch of 3 in 12 inches or less. This flat roof system is still used in some residential applications because of its affordability and fire resistance.

Cad details document name pdf dwg download all cad construction details 37 1 mb 3 4 mb mc01 identification of roof areas 694 kb 167 kb mc01a single layer underlayment 678 kb 302 kb mc01b double layer underlayment 711 kb 322 kb mc02 vent pipe flashing 626 kb 349 kb mc03 valley. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. Flat roofs usually come with a 10 to 20 year warranty but can last 25 years if you build the roofs right and maintain them using commonsense rules. Most often used in commercial and industrial applications this flat roof system contains layers of waterproof membrane such as a treated fiberglass basemat tar and gravel to seal the flat roof surface.

The major difference between the warm flat roof and the cold flat roof has to do with the air flow between the roofing timbers known as joists that help to hold up the roof. From there the flat roof system you choose will determine the materials you apply. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used. All three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof.

Of course flat roofs are not flat but have a very slight roof pitch of between 1 4 to 1 2 per foot. Traditional homes often have sections of flat roof over shed dormers above porches and garages and on balconies.