Part 4 flat roof construction.
Timber flat roof construction details uk.
The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.
It must provide adequate protection against the elements keeping the buildings structure and interior dry.
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 building regulations in the uk provide guidance on roof design.
Flat roofing under construction plywood decking is then used to cover the joists with the width in between also determined by the weight being placed upon them.
Part 3 pitched roof detail.
Covers flat roof materials and flat.
For homebuilders a timber frame for a flat roof is usually the cheapest option and the easiest to build.
Modern timber roofs are mostly framed with pairs of common rafters or prefabricated wooden trusses fastened together with truss connector plates timber framed and historic buildings may be framed with principal rafters or timber roof trusses roofs are also designated as warm or cold roof depending on how they are designed and built with regard to thermal building insulation and ventilation.
For additional stability you can also use steel joists that are built into one or both of the walls.
There are two basic components of a timber roof.
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.
Part 2 pitched roof construction.
Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used.
This will give additional stability to the roof structure.
Wherever possible joists should span the shortest distance of the roof plan.
Others would treat even steeper pitches as flat roofs.
But this type of roof is seldom as attractive as the pitched form as it can result in a blocky stunted appearance.
A flat roof must be strong durable and stable throughout its lifetime.
A roof is defined in bs 6229 as a flat roof if it has a pitch of 10 degrees or less.
Getting the balance right here is crucial as too much weight will inevitably lead to an unstable roofing structure.
The pitch is governed by the roof covering and the required rate of rainwater discharge.
Roof ridges and ridge tiles roof hips and hip tiles roof valleys roof verges and lead flashings.
The supporting structure and the covering.
Covers pitched roof materials basic pitched roof designs cold and warm pitched roofs and pitched roof construction.
When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.
Covers pitched roof detail.
