Felt On Timber Flat Roof

You can either measure the roof from the ground or by standing on a ladder and actually going up on the roof.

Felt on timber flat roof.

Felt is laid on a flat roof to help keep the roofing system waterproof. The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists. View as grid list. Old asbestos roofs are often replaced with flat roofs.

While laying felt is not an easy job it can be done by anyone who has the patience to deal with it. Light weight shed roofing felt is not suitable for flat roof construction. Multiplying these two together will give you the square footage of the roof. 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.

Check to ensure the roof is in good enough condition to walk over. Osb3 2440mm x 1220mm x 11mm. Felt is usually used on flat roofs under tar or tar and gravel. So any timber joists that are used need to be strong enough to support this weight.

As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. Make sure the roof is clean dry and that all nail heads are flush with the deck. Felt is also used under shingles as a sub layer in most cases as additional protection and to protect against nail heads on the wood covering or other underlying shingles if re roofing over existing roof. Step 1 prep work.

It is very seldom used alone. So whether your new flat roof is to be made of timber concrete or felt or a combination of these materials you need to comply with flat roof building regulations. For additional stability you can also use steel joists that are built into one or both of the walls. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls.

Sizes of joists needed for flat roof construction. T g is recommended as a base for cure it grp roofs as well as torch on felt flat roofs. Can t find the timber sheets you re looking for. Email us call us.

When installing or repairing a flat roof you must adhere to building regulations. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. You will then need to measure the length and width of the roof. These things will affect the timing cost and overall running of your project.

Here are simple steps to get you started.