Timber Flat Roof Construction Details Uk

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.

Timber flat roof construction details uk.

Part 4 flat roof construction. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. 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. Covers pitched roof detail.

The pitch is governed by the roof covering and the required rate of rainwater discharge. A flat roof must be strong durable and stable throughout its lifetime. The construction of the flat roof is similar to that of the timber upper floor. Part 3 pitched roof detail.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. For additional stability you can also use steel joists that are built into one or both of the walls. Covers pitched roof materials basic pitched roof designs cold and warm pitched roofs and pitched roof construction. But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.

While many will contact a professional installation company to complete the job there are others who will feel confident enough in their own ability to install a flat roof onto the. 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. 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.

Timber flat roof construction usually consists of structural joists topped with a decking of plywood or a similar sheet material. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. What pitch is a flat roof. Flat roofs are exceedingly popular with those looking to create a cool modern home.

Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings. Trada and approved document part a give guidance on sizes of joists for flat roofs relating to spans and loading. When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off. As with the construction of any type of roofing system it s crucial to understand the correct process and essential criteria involved in flat roofing construction.

There are two basic components of a timber roof. Others would treat even steeper pitches as flat roofs. The supporting structure and the covering. Covers flat roof materials and flat.

Part 2 pitched roof construction. Wherever possible joists should span the shortest distance of the roof plan.