Roof Membrane Under Tiles

The main purpose of under tile plastic membrane is to.

Roof membrane under tiles.

Prevent leaks with roof membrane and tile underlayment. It acts as an extra layer protecting the roof from severe weather. Roof pitch is another important consideration since it will determine how big the membrane lap needs to be. As a general guide pitches under 14 degrees should have a lap of 150mm while those over 15 degrees usually require a lap of 100mm.

Free delivery over 25. Resistant to wind driven rain and snow these membranes must perform to a satisfactory level which includes criteria on wind uplift. The main purpose of roofing underlay is to reduce the effect of wind loading on the slate or tile roof covering according to bs5534 the code of practice for slating and tiling. Prevent the ingress of wind driven rain and dust in roofs that are not 100 waterproof.

Tile roof underlayment is a membrane applied directly to the tile roof deck. The secondary purpose of sarking felt is to provide a waterproof barrier and allow for the safe disposal of water that has collected on the upper surface of the. Let s look at these in more detail. Flexible and easily handled.

Roof breather membrane on the other hand allows far greater moisture transfer making it crucial that there is adequate air movement above. Wind uplift was introduced as part of regulations in 2015 as with a lot of wind uplift under a membrane the material can force roof tiles off the roof and endanger pedestrians below. According to bs 5534 the british standard for slating and tiling and bs 5250 the code of practice for the control of condensation there are two main types of roofing underlays. Underlayment is indispensable in the construction of tile roofing for the following reasons.

The material equalises the pressure and compliments the function of the roof tiles. High resistance non breathable underlays and low resistance breathable or vapour permeable membranes. You can place it under all other roofing materials. Used for the prevention of draughts and dust penetration into the roof spaces through tiles and prevents damage to the ceilings rotting of timbers and corrosion of plumbing.

If your roof pitch is over 35 degrees you may be able to reduce the lap to 75mm.