Flat roof construction for residential.
Flat roof deck construction details.
A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal.
That will help you remember certain factors and details to build the best possible flat roof.
Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape.
Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof.
This article discusses rooftop deck construction details to avoid building leaks or rooftop deck safety hazards.
Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.
Photo by dave holbrook.
Depending on the type of roof you are considering here s some technical details you may find useful.
First you must make sure the roof is strong enough to support 55 lbs per square foot.
They are merely placed on top of another structure.
If insulation is installed below the flat roof deck this is called a cold roof.
Construction studies drawing detail showing how to draw a flat roof warm deck construction detail to a scale of 1 10 with a short introduction highlighting t.
Epdm is the best choice for most rooftop decks.
When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.
These decks are often referred to as floating as they are not secured in place as a stand alone structure.
Others would treat even steeper pitches as flat roofs.
Generally roofers discourage this method for cold climates because it can promote condensation and requires ventilating the roof which may be difficult to do in small or tight spaces.
Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance.
We include walk on roof surfaces roofing membrane to use below a rooftop deck and construction of rooftop deck railings and posts.
Some key details for a leakproof rooftop deck are.
Insulation for the warm flat roof only the basic construction process.
Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications.
The definition of a flat roof according to bs 6229 is having a pitch less than 10 o to the horizontal however some in the industry would consider up to 15 o as their definition of a flat roof.
Building a deck over a flat roof is very similar to building a deck over a concrete patio.
Of course you don t need to live in a modern house to deal with a flat roof.
To build a flat roof you ll want to have a thorough understanding of how the process of constructing the flat roof works and the different methods available.
The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will.
