Flat Roof Deck Detail

Consider geography budget and use for the roof to determine the best option.

Flat roof deck detail.

Wood deck and railing leaks. Photo by dave holbrook. Depending on the type of roof you are considering here s some technical details you may find useful. This article discusses rooftop deck construction details to avoid building leaks or rooftop deck safety hazards.

If insulation is installed below the flat roof deck this is called a cold roof. Flat roof details and information relating to insulating a flat roof. Load bearing or primary structure usually constructed in timber in a residential construction. 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.

A note to consider before construction. What s the difference between a regular roof and a flat roof and why does it require different material. Roof deck providing the base for the waterproof membrane and in some cases the insulation. Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance.

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. Some key details for a leakproof rooftop deck are. Others would treat even steeper pitches as flat roofs. Details both in 2d and 3d to give a clear understanding.

We include walk on roof surfaces roofing membrane to use below a rooftop deck and construction of rooftop deck railings and posts. Rooftop decks walk on roofs. This is placed over the. Often there is a wood deck installed on top of a flat roof or some sort of a railing system.

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. Epdm is the best choice for most rooftop decks. To make these railings securely attached to the roof builders often create penetrations for every railing post on the roof. When a roof is flat it actually will have a very slight slope water is going to spend a lot more time in one place giving it more time to find a way underneath the roof.

The key is in the word flat.