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Breathable membranes are a unique form of insulation material. They are particularly valuable when used in pitched roof projects as they prevent the build-up of condensation. This can lead to damp, mould and rot. Which, in turn, can lead to structural damage within a building. A breathable membrane can prevent these problems from occurring. But what are breathable membranes? How do they work? And why are they so important? Here&#;s everything you need to know about breathable membranes:
Why Are Breathable Membranes So Important?
Breathable membranes are important because they help to prevent damp. They can also keep mould at bay, with damp often being the root cause of mould. Damp can cause breathing problems in affected homeowners or tenants. It can also lead to frost damage or structural damage if left unchecked. For this reason, breathable membranes should be considered essential. They allow insulated buildings to release surplus moisture vapour into the air. In short, breathable membranes ensure that properties remain dry whilst still being able to breathe.
Another benefit of breathable membranes is that they make insulation work more effectively. Without a breathable membrane, moisture will build on the insulation. This layer of moisture will make the insulation ineffective. This will leave your home vulnerable to heat loss, and increased heating bills.
What Protection Do Breathable Membranes Provide?
Whilst they may be relatively thin layers of material, breathable membranes are strong. They are water-resistant, snow-resistant, and dust-resistant. They ensure that anything you don&#;t want in your property stays out! For this reason, breathable membranes are ideal for use in situations where exterior cladding is not completely watertight. Tiled roofs or framed wall constructions are great examples of this.
One of the most frequently asked questions about breathable membranes is &#;how do breathable membranes work?&#; In short, breathable membranes work by providing ventilation and reducing condensation risk, whilst still providing a waterproof layer of protection. Breathable membranes prevent water from entering a property. They also serve the secondary purpose of preventing environmental impurities, such as dirt or rain, from entering the structure. Breathable membranes protect properties from damage and keep them watertight. They also have thermal benefits, helping to insulate the property in many cases.
How Do TLX Breathable Membranes Manage Condensation Risk?
Managing condensation risk is an integral role of a good breathable membrane, and TLX breathable membranes are amongst the best on the market. Using TLX UV breathable membranes will reduce the risk of condensation build-up in your roof or wall space considerably. This is because these watertight membranes allow air to pass through them. This will ensure that any vapour that is carried within the air particles, or other environmental element, has somewhere to go. You can combine these benefits with the traditional benefits of insulation by using TLX Gold multifoil insulation. Not only does this offer superior insulation properties, but it also boasts an integrated UV25 breathable membrane. This membrane has been designed to prevent condensation.
TLX manufactures three different grades of breathable membranes. They are the UV10, UV15, and UV25. The main difference between these three membranes is their strength, with the UV10 being the most lightweight and the UV25 being the strongest. The type of renovation or build project you are undertaking, as well as the other materials you are using, will determine which UV level is right for you.
How to Install a Breathable Membrane
When installing a breathable membrane, it should always be positioned on the cold side of the insulation. When insulating a roof, this would be the side closest to the tiles. This allows the membrane to prevent any moisture that gets through the external cladding to pass any further.
Different TLX breathable membranes should be installed in different ways. You should always install them in accordance with the manufacturer&#;s instructions. But here is a general guide for how to install a TLX breathable membrane:
Install an eaves support tray. This will support your installation and is sometimes also referred to as an eaves guard. You could also use a UV-resistant membrane that is fitted along the eaves. Each option is effective, but it is important not to miss this step.
Lay the breathable membrane. This should be positioned parallel to the roof eaves. The printed side of the membrane usually faces outwards. The bottom of the membrane should overlap the eaves support tray by at least 150mm. But don&#;t overlap this too much, or it will be exposed when the tiles are laid, creating an untidy finish.
Drape the breathable membrane. The membrane should not be pulled taut, unless you intend to counter batten your installation.. If not, the membrane should drape slightly between the timber rafters or counter battens. Aim for a dip of between 10mm and 15mm. Once you have achieved your desired drape, add a clout nail to hold the membrane in place temporarily. The tiles will hold this into position in a more permanent way when they are fitted.
Repeat this process, starting at the bottom of the roof and working upwards. You should overlap your layers of breathable membrane, but the amount of overlap required will be determined by the manufacturer. If the overlap does not coincide with a timber batten, an additional batten can be installed to ensure the overlap remains, and to prevent the tiles from touching the membrane. If you are using TLX breathable membrane then your battens should be at least 25 mm thick.
Installing a TLX breathable membrane is a relatively straightforward and simple process. It is one that will have considerable benefits to your property. TLX breathable membranes improve structural integrity and protect properties from condensation and water damage. TLX breathable membrane is fully BBA approved and will last as long as traditional roof tile underlays, providing they are not exposed to sunlight for long periods. It is an investment worth making for the security of your home.
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What is breathable membrane and how it works
I: What is breathable membrane
Prevent damp in a building by installing a breathable membrane. The installation will assist in keeping mould at bay, which is normally caused as a result of damp conditions. But what is breathable membrane, and how does breathable membrane work?Many property owners and tenants face the problem of damp in buildings. It can cause serious issues, including breathing problems, frost damage and even structural damage. Breathable membrane allows an insulated building to release surplus moisture vapour into the air. This keeps the structures secure and dry.
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II: Why to use Breathable membrane:
Damp in buildings can cause a number of serious problems, such as:Damp patches/Mould growth, mildew, salts, staining and &#;tide marks&#;/Damage to surface finishes/Corrosion and decay of building fabric/Slip hazards/Frost damage/Poor performance of insulation/Damage to equipment, or electrical failure.
The most common causes of persistent damp in buildings are:
Surface condensation.Interstitial condensation (condensation within the fabric of a building's construction, either on the surfaces of components that make up the fabric, or sometimes within the components themselves).
Penetrating damp.Rising damp.Breather membranes (or breathable membranes) are water resistant but vapour permeable. Typically they are used within external wall and roof constructions where the external cladding may not be completely water-tight or moisture resistant, such as in tiled roofs or framed wall constructions.
The membrane is located on the cold side of insulation and prevents moisture (as well as snow, wind, and contaminants such as dust) that may have been driven through the external cladding, from penetrating further into the structure. However, their air-permeability allows the structure to be ventilated, avoiding the build-up of interstitial condensation.
Any moisture that forms on the outside face of the membrane should be able to vent or drain to the outside.Breather membranes can also improve the thermal efficiency of a building&#;s external envelope and can provide temporary protection from the weather during construction or repair works.
III: Breathable membrane working principle:
Breathable membranes are water-resistant (as well as resistant to snow and dust), but air-permeable. You would usually use them within external wall and roof structures in which the exterior cladding may not be completely water-tight or moisture-resistant, such as in tiled roofs or framed wall constructions.The membrane is located on the cold side of the insulation. It prevents moisture that may have been getting through the external cladding from piercing further into the structure. However, their air-permeability allows the structure to be ventilated, avoiding the accumulation of condensation.Breathable membranes also act as a secondary layer of protection to help prevent external environmental impurities such as dirt and rain from entering the structure and causing damage.
If you used no membrane, then the water would condensate and start to drip down through the structure. Over time, this would weaken the structure and make it look unappealing. It would also cause damp problems further down the line.In addition to the above, breathable membranes can be used to improve the thermal properties of a structure. They can provide short-term protection from adverse weather conditions during essential construction or repair works.
IV: Breathable Membrane Functions:
The functional qualities for breather membranes are:
a.To restrict any rain water that penetrates past the exterior finish
b. To perform as a breather material allowing any moisture trapped in the wall cavity
to escape
c. To act as a wind barrier to restrict movement of air through the wall
V: Breathable Membrane Applications:
Breathable roof membranes are typically used in constructions where external cladding or tiles are not completely water-tight or resistant to moisture. The breather membrane is located on the cold side of a roof&#;s insulation - beneath the support for the tiles to prevent anything penetrating the structure. The three key performance areas for breather membranes are: resistance to water vapour, water vapour permeability and water tightness.
VI: About Derflex:
Derflex is one of the oldest breathable membrane manufacturer at China for more than 20 years.
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