Flat Roof Details Uk

Waterproof membrane to prevent water penetrating the structure and interior of the building.

Flat roof details uk. A flat roof usually consists of the following. For additional stability you can also use steel joists that are built into one or both of the walls. A waterproof exterior layer is essential and there are a number of options including bitumen based felt or asphalt epdm rubber and pvc based systems as well as cold applied liquid systems bitumen coverings. Bitumen felt flat roofs are affordable in price and provide a great waterproofing result.

A flat roof must be strong durable and stable throughout its lifetime. What pitch is a flat roof. There is also the scope to incorporate a green roof onto the flat structure. The longevity of the roof depends on the quality of the materials used.

Flat roofs are exceedingly popular with those looking to create a cool modern home. Flat roof options help to free up internal space and are often cheaper that pitched roof options as they require fewer materials to cover the same roof span. 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. The steels or rsj s rolled steel joists are often built into one or both walls to give added stability to the roof structure.

A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less. Although flat roofs are cheaper to build than pitched roofs they have a shorter life span. It must provide adequate protection against the elements keeping the buildings structure and interior dry. In the traditional poor and roll process bitumen is supplied in blocks broken up and heated on site in a boiler until molten.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. We love the flexibility of a flat roof for certain design limitations but they have a bit of reputation for leaks and repairs. Flat roofs were uncommon in the uk until after the second world war. As a mass rebuild of housing got underway it was discovered to be a cheaper alternative to the traditional pitched roof style.

A roof is considered to be flat when it is of a slope of 1 5 o to the horizontal. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. Flat roof construction for residential. Just enough slope to drain water but also flat enough to be a problem if not constructed properly.

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.