Metal Flat Roof Construction Detail

When building a flat roof it is vital that a degree of falls is built into the construction to ensure rainwater run off.

Metal flat roof construction detail.

Liquid applied systems such as glass fibre were introduced and are now quite widely used. The cover flashing is placed over the top of the sleeve and around the pipe extending down to cover top of the waterproofing upstand. 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.

The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Traditionally domestic flat roofs use two or more built up layers of bituminous felt as their weather proofing. The spacer system in a double skin metal roof is used to create a cavity between the liner and weather sheet for the layer of insulation. Other flat roof construction details often refer to the types of flat roof coverings.

This will give additional stability to the roof structure. For additional stability you can also use steel joists that are built into one or both of the walls. Others would treat even steeper pitches as flat roofs. 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.

The spacers are structural items which support the weather sheet and they are always positioned over purlins or other structural members and must be fixed securely to them. Single ply membranes are also used but are particularly suitable for larger roofs. Metal roofing panels are slippery when wet dusty frosty or oily do not attempt to walk on a metal roof under these conditions. Introduction to flat roof details the roof is a key element of the building structure providing protection from the elements and has a vital role in reducing heat loss from the building.

Wear soft soled shoes to improve traction and to minimize damage to the paint finish. When choosing a flat roof you need to take a number of considerations into account including the look you want to achieve the size of your flat roof the type of weather it ll face and the amount of labour it will require. Roofs tend to be either pitched or flat and typically in residential construction timber is the most common material used. A guide to flat roof options.

Cover flashings are also used to seal rooflights upstand kerbs and plant support bases. It must provide adequate protection against the elements keeping the buildings structure and interior dry.