What Timber To Use On A Flat Roof

The usual recommendation is that osb 3 or osb 4 bs en 300 should be used in flat roofs.

What timber to use on a flat roof.

Osb has almost the same application and usefulness as the plywood it is made from wafers of timber rather than full sheets of veneer. Where a new flat roof abuts an existing external wall the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate wall bolted to the wall. For additional stability you can also use steel joists that are built into one or both of the walls. Installing deck on a flat roof tips.

When timbers are used in flat roofing they obviously need to be waterproofed so boards are normally laid across the joists and then a felt or rubber is used to cover the boards to make them waterproof. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. Push fit easyfix shoes at gaps of 400mm down the length of timber battens 8 per m2 recommended. It s often chosen as the standard timber for roof extensions or joist refurbishment as it s the most cost effective internal structural timber.

Choose what height timber batten to use paying close attention to the height of any existing door threshold. C16 timber is commonly used in floor and roof joists for internal building work. From the initial building and installation to the materials most often used to cover the roof flat roofs are fairly cheap. Just enough slope to drain water but also flat enough to be a problem if not constructed properly.

In the majority of cases the covering will be plywood or osb timber which is more commonly called stirling board. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. C16 timber is kiln dried timber certified to comply with the criteria of strength grade c16. By far the biggest advantage of using a flat roof is the expense.

Although the construction of the actual roof component of a parapet roof is almost identical to a typical pitched roof it is wise to use a greater minimum roof pitch than is recommended by the roof sheet. Many types of material used for installation run about 80 a foot which makes a flat roof extremely affordable both for the initial installation and the. Ensure that the product has been duly certified by the british board of agrément bba before it is used for your project. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space.