Today flat roofs are not actually flat.
Flat roof concealed gutter system.
Furthermore flat roofs with internal drainage are built to direct water to the central points of the structure with a concave shape the opposite of a pitched roof.
On this page you can find the pdf instructions for installation of a typical box gutter detail with the dryseal flat roofing system.
Concealed guttering and fascia system.
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This means for every 1 foot of horizontal distance the roof will drop 1 4 inch.
The gutter can either be form formed in the flat roof or an aluminium box gutter can be installed.
Built in gutters also referred to as box gutters are considered a concealed roof drainage system.
Take the guttering out of the equation.
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Box gutters are valley like troughs at the edges of roofs which are concealed in appearance and don t draw attention from the beauty of the house.
A light rain or drizzle for example remain remain on a flat roof for a short period of time.
Contemporary designers frequently aim to produce the same clear and simplified forms that appeared at the beginning of the 20th century but are now free to use a wide range of new materials and construction techniques that reflect present day technology.
In the past flat roofs were flat no slope.
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At the least a roof must have a 1 4 per foot slope.
Today flat roofs are used by architects for the same reasons that they became a cornerstone of modernist architecture.
There must be some momentum for the water to move into the flat roof drainage system.
They have minimal slope.
When considering a modern design flat roofs are more typical.
Built in gutters also called box or hidden gutters are actually a type of rain gutter and can replace the latter especially when the conspicuous appearance of the rain gutter is the main issue.