Flat roof construction manual pdf

How is a flat roof constructed?

How are Flat Roofs Constructed ? On a basic level, flat roof construction comes in the form of roofing timbers, or joists as they are more commonly known or steels that are laid across two uprights (walls in most cases). The joists are then either laid on top of the steels or cut into them.

How thick should a flat roof be?


What’s the best flat roof system?

Ethylene Polypropylene Diene Monomer ( EPDM ) is one of the most versatile rubber roofing options on the market. Considered to be one of the best materials for flat roofs, rubber is a popular choice for industrial and commercial applications thanks to its ability to withstand extreme weather conditions.

What are the materials used to make houses with flat roofs?

Modern flat roofs can use single large factory-made sheets such as EPDM synthetic rubber , polyvinyl chloride ( PVC ), thermoplastic polyolefin ( TPO ) etc. Although usually of excellent quality, one-piece membranes are called single plies are used today on many large commercial buildings.

What is asphalt flat roof?

Flat roof felts are bitumen impregnated sheets, which are applied in layers. They are available as either self-adhesive sheets or bonded together with hot or cold bitumen .

Does a flat roof need a Vapour barrier?

Constructing a Flat Roof Using EPDM Warm deck flat roofs can be constructed on most modern construction material types such as concrete, timber and timber based sheets. A vapour barrier will then need to be installed to reduce condensation in the roof structure.

How many layers can a flat roof have?

Asphalt shingles are able to have one more layer of roof added on top of the initial roof, making a total of two layers of roof. EPDM roofing and TPO roofing are also known to be able to typically maintain two layers of roof without causing problems. Every roof can be different in certain ways.

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Why do you put gravel on a flat roof?

A Gravel or pea shingle on a roof serves two purposes. One is to act as ballast to weigh down the covering surface and help prevent it being blown off in high winds. The second is to provide protection from the sun’s rays, which can both soften the covering material and make it brittle.

How much weight can you put on a flat roof?

Some live loads for sloped roofs and flat roofs in northern area of the U.S. are rated at 40 pounds of weight per square foot of roof area.

Why are flat roofs so expensive?

As a result, rain and snow tend to build up or puddle at various spots on the roof , which often causes leaks as the water sits there for quite some time. For this reason, flat roofs tend to cost more overall than pitched roofs .

How often should a flat roof be replaced?

every 15 years

What do you use on a flat roof?

Flat Roof Replacement Options Metal. Metal has been used on flat roofs for many decades, and it has proven that it is durable and can last about 35 years. EPDM or TPO. Built-up Roof . Modified Bitumen. Spray Applied Coating.

What are the parts of a flat roof called?

Essential Parts of a Flat Roofing System Plasterboard Ceiling. The plasterboard ceiling is the visible interior part, which covers the entire roof . Decking. The decking is the skeletal part of the roof . Insulation and Vapor Barrier. The insulation and vapor barrier both have an important function. Waterproof Layer and Covering.

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Are flat roofs really flat?

Flat roofing is not actually flat ; it has a very low slope—between 1/4 to 1/2 inch per foot—so that it drains water. But such a low slope holds snow and water much longer than a steeply pitched roof and therefore needs a very different material to stay watertight.