Felt On Timber Flat Roof

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Felt on timber flat roof.

Step 1 prep work. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists. You can either measure the roof from the ground or by standing on a ladder and actually going up on the roof.

Osb3 2440mm x 1220mm x 11mm. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing. It is very seldom used alone. So any timber joists that are used need to be strong enough to support this weight.

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. T g is recommended as a base for cure it grp roofs as well as torch on felt flat roofs. Felt is usually used on flat roofs under tar or tar and gravel. 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.

You will then need to measure the length and width of the roof. The basic construction of a flat roof starts with roofing timber that is laid across two upright items usually two walls. These things will affect the timing cost and overall running of your project. Can t find the timber sheets you re looking for.

The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone. 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. Light weight shed roofing felt is not suitable for flat roof construction. Check to ensure the roof is in good enough condition to walk over.

Email us call us. Sizes of joists needed for flat roof construction. When installing or repairing a flat roof you must adhere to building regulations. Follow the 10 steps below in order to felt a flat roof.

While laying felt is not an easy job it can be done by anyone who has the patience to deal with it. Multiplying these two together will give you the square footage of the roof. For additional stability you can also use steel joists that are built into one or both of the walls. Felt is laid on a flat roof to help keep the roofing system waterproof.

Here are simple steps to get you started.