Roofing Membranes

Roof membranes are used to protect the building beneath the roof tiles so that insulation, timber and other materials aren’t exposed to the wet. The primary job of a roof membrane is to ensure that water cannot ingress into the structure so it can’t cause damp and mould. When choosing a roof membrane, it’s important to make the right choice between types. Timber frame membranes and metal roof membranes are specific to those build ups and boast different properties. 

Breathable membranes

Breathable membranes perform the primary function of ensuring water can’t ingress from a roof. Resistant to wind, driven rain and snow, these membranes must perform to a satisfactory level which includes criteria on wind uplift. 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. 

Breathable membranes help to tackle condensation build up which is found more commonly in buildings nowadays as lifestyles change. Things like drying clothes indoors and cooking without a lid can cause excess moisture in the air which travels upwards. Breathable roof membranes are installed on the cold side of the roof’s insulation and beneath the batten. As moisture can pass through the membrane, it passes up and out of the building to help ventilate. 

Non-breathable membranes

Non-breathable membranes, also known as non-permeable membranes, are entirely waterproof and wind tight. They don’t allow condensation to pass through the roof structure, so they’re installed on the warm side of the insulation to keep the insulation dry and moisture-free. These types of membrane must be combined with eaves vents and dry ridge ventilation to allow the moisture to escape. A traditional approach of low-level eaves and high-level ridge ventilation is recommended. 

Air permeable membranes

Air and vapour permeable membranes are often used a sole ventilator in a roof build-up but it’s not recommended that one product is relied on. If the system does fail it’s good to have a back up or an alternative product that won’t risk condensation, mould and damp. Manufacturers rigorously test their air and vapour permeable membranes to ensure they’re able to support sole ventilation but we recommend being thorough and prudent when installing. 

Products in Roofing Membranes:

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Showing 1-72 of 181