![]() ![]() The looseness or tightness of an envelope is determined by the materials used to construct it. Tight building envelopes restrict airflow to and through its underlying structure, while a loose envelope allows for a freer flow. There are two types of building envelopes: loose and tight. Its purpose is to shield the structure from the elements and ultimately lengthen its lifespan. It is comprised of the roof, subfloor, exterior doors, windows, and exterior walls. The term "building envelope" refers to the entire outside of a building. Something you may have not considered is properly maintaining your "building envelope."ĭid you know the envelope determines 40% of a building's energy performance? What is the building envelope? Obvious methods are to reduce usage: turn off your lights, lower the heat, keep the windows closed. This again can lead to mould growth and resulting in structural damage.People today often seek out ways to reduce their energy consumption and costs. Only if you install the products correctly, you can prevent leaks and thus the penetration of moisture into the building envelope. ![]() The installing is just as important as the use of high-quality materials. ![]() It’s more about “how to use the products” All materials, plastics and adhesive products used in a building must be extremely resistant to ageing, as a building should function perfectly for decades. There is a wide range of suitable products for making the airtight layer, such as air and vapour control layers and adhesive tapes (we list the main types of vapour control and airtightness control in this article). The more energy-efficient a building needs to be, the more important it is to build airtight. As a result, the insulation becomes less efficient, resulting in higher energy consumption and higher costs. Wind-tightness, on the other hand, protects the building from air currents that enter the insulation from outside and exit elsewhere. This is annoying because it reduces the efficiency of the building envelope and leads to higher energy loss and consumption, which in turn affects heating or cooling costs.ĭo not confuse air tightness with diffusion tightness! Even if no air flows through the building envelope, water vapour can still diffuse through the building membranes. This leads to energy loss.Īnd heat loss is something you don’t want to have. If the airtightness is not given, heated or cooled air can escape from the inside of the building. Airtightness prevents air currents from flowing through the building envelope from the inside to the outside. The airtight building envelope prevents heat loss through convection and ensures that no condensation occurs in the construction.
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