Flat Roof Deck Construction Details

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.

Flat roof deck construction details.

Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. Flat roof construction for residential. First you must make sure the roof is strong enough to support 55 lbs per square foot. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.

This is placed over the. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. 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. They are merely placed on top of another structure.

The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will. We include walk on roof surfaces roofing membrane to use below a rooftop deck and construction of rooftop deck railings and posts. A note to consider before construction. Some key details for a leakproof rooftop deck are.

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. Others would treat even steeper pitches as flat roofs. 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. Building a deck over a flat roof is very similar to building a deck over a concrete patio.

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. 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. That will help you remember certain factors and details to build the best possible flat roof. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span.

These decks are often referred to as floating as they are not secured in place as a stand alone structure. Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance. Insulation for the warm flat roof only the basic construction process. This article discusses rooftop deck construction details to avoid building leaks or rooftop deck safety hazards.

Depending on the type of roof you are considering here s some technical details you may find useful. Photo by dave holbrook. Rooftop decks walk on roofs.