Residential Flat Roof Construction Details

For additional stability you can also use steel joists that are built into one or both of the walls.

Residential flat roof construction details.

Traditional homes often have sections of flat roof over shed dormers above porches and garages and on balconies. A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. But flat roofs take a pounding from harsh weather which is why they rarely last as long as a good sloped roof. Ultimately a flat roof should play a part in a total architectural composition and has the ability to enhance the aesthetic and practical outcomes of a home.

Flat roofs actually slope up to approximately ten degrees to shed water. Flat roofs on houses are primarily found in arid regions. Pros and cons for flat roof materials all three types of flat roofing cost 250 to 350 per square 100 square feet but prices vary according to region and size of the roof. From there the flat roof system you choose will determine the materials you apply.

This will give additional stability to the roof structure. And their horizontal lines abound in the west and in urban areas. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.

A flat roof usually consists of the following. Most flat roofs are typically not as long lasting or durable as sloped ones because the latter shed snow and rain a lot quicker. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure. However over the last few decades new and advanced materials have been developed.

Waterproof membrane to prevent water penetrating the structure and interior of the building. Flat roof types. 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. A flat roof must be strong durable and stable throughout its lifetime.

It must provide adequate protection against the elements keeping the buildings structure and interior dry. Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. Flat roofs come in many shapes and sizes which include parapet roofs roof decks and green roofs to name just a few of the options available. A classic flat roof is either almost completely level or has a very slight pitch of 3 in 12 inches or less.

In high wind areas such as where a cyclone or hurricane may make landfall the main engineering consideration is to hold the roof down during severe storms.