Flat Roof Deck Detail

Roof deck providing the base for the waterproof membrane and in some cases the insulation.

Flat roof deck detail.

Wood deck and railing leaks. What s the difference between a regular roof and a flat roof and why does it require different material. 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. We include walk on roof surfaces roofing membrane to use below a rooftop deck and construction of rooftop deck railings and posts.

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. Load bearing or primary structure usually constructed in timber in a residential construction. Rooftop decks walk on roofs. Flat roof details and information relating to insulating 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 building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. Some key details for a leakproof rooftop deck are.

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. This is placed over the. Consider geography budget and use for the roof to determine the best option. Careful detailing of membrane roofs at corners doorways and penetrations is critical for long term performance.

Depending on the type of roof you are considering here s some technical details you may find useful. Others would treat even steeper pitches as flat roofs. A note to consider before construction. 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.

Often there is a wood deck installed on top of a flat roof or some sort of a railing system. The key is in the word flat. The roof deck surface should sloped away from the house a minimum 1 8 inch per foot so the water will. From there the flat roof system you choose will determine the materials you apply.

If insulation is installed below the flat roof deck this is called a cold roof.