Quick view Details 100mm Celotex sku: CLO-50782 100mm - Celotex GA4100 General Purpose PIR Insulation Board - 2400 X 1200 X 100mm MSRP: MSRP: £36.16 ex. VAT Now: £43.39 inc. VAT Choose Options Compare Quick view 100mm Celotex sku: CLO-50782 100mm - Celotex GA4100 General Purpose PIR Insulation Board - 2400 X 1200 X 100mm Celotex GA4000 is a multi-purpose insulation board which can be specified for use in a variety of applications such as pitched roofs, flat roofs, solid masonry walls, floors, timber framed & steel framed systems. It has long been at the heart of the... MSRP: MSRP: £36.16 ex. VAT Now: £43.39 inc. VAT Choose Options Compare Compare Selected Breathable Membrane & Felt What is a breathable membrane? Breathable membranes, also known as ventilating membranes or dehumidifier membranes, are used to increase ventilation and minimize condensation accumulation in the roof space while also ensuring that insulation is effective. Why breather membranes are required Moisture frequently finds its way into the roof space as vapor and condenses on a chilly surface. This condensation can lead to a variety of problems since it is trapped within the roof space.. Firstly, if insulation gets damp, the insulating properties are reduced, meaning the building is not insulated as well, and will result in higher energy bills as heat is lost more easily. Secondly, Damp problems are a common problem caused by poor ventilation. Water causes damp and mould if it is present over time. Apart from being unsightly and causing health issues, dampness can also cause serious structural damage to buildings due to rot on wooden structures. A house's average moisture output is 14 liters a day, so preventing moisture from accumulating in the roof space is critical. A breather membrane prevents dampness from entering the roof space and in some cases allows it to depart..This means that insulation remains effective, and the likelihood of damp and mould occurring is greatly reduced, and the structural integrity of the building remains secure. Different types of breather membrane Depending on the requirements of the project being carried out, a variety of different types of breather membrane are available. Vapour permeable breather membranes Water vapour permeable breather membranes let water vapor to pass through them and out from the walls and roofs. Vapour permeable breathing membranes prevent as much water vapor from condensing inside the roof or wall space as possible, reducing damp, mildew, and rot. Air permeable breather membranes Air permeable breather membranes are designed specifically to allow both air and water vapour to flow through the roof or wall of a building. Air permeable breathing membrane eliminates the need for a vapour control level since vapour and air can freely pass through, and the air permeable membrane also functions as ventilation. Air permeable membranes, on the other hand, function as a barrier to stop rain, wind, and snow from entering a roof or wall area. Permeable timber frame permeable breather membranes are thinner and lighter than standard permeable breather membranes. They've been designed for use on buildings with timber frames, particularly during the construction process - wooden frame breathable membranes can be used as temporary cladding to shield the structure from weather while it's being built, and then protect it from internal moisture accumulation after the building project is done. Vapour control layers Vapour control layers (VCLs) are a type of breathable membrane that prevents any water from entering or leaving the roof space, ensuring that moisture does not move between layers or through walls or roofs and accumulate within the roofspace. This is in contrast to breathing membranes, which enable water vapor to escape via the membrane. Liquid breather membranes In certain situations, the structure of a wall or roof is quite intricate, making it difficult to install a breathable membrane. In this case, a liquid breather membrane is the ideal answer - it can be applied with a paintbrush or roller and covers the entire surface, including tight angles. Builders Insulation's is proud to offer a wide range of breathable membranes for your latest project, from brands including Cromar, DuPont Tyvek, NOVIA, POWERLON and Protect. We offer the greatest quality, most secure seals on the market, and some of the most competitive pricing.