What are the benefits of installing an AVCL?

An AVCL has become an important and essential part of modern roofing systems. This plays a vital role in ensuring the structural integrity of the roofing system, while also boosting energy efficiency and overall performance. But what is an AVCL? And what are the benefits of installing an AVCL?

What is an AVCL?

An Air and Vapour Control Layer is often referred to as an AVCL, and this is an essential part of many roofing systems. This is designed specifically to control the movement of air and moisture within a building’s envelope. The AVCL is installed to prevent the water and condensation from infiltrating through the roofing structure, where it can cause significant damage over time. This also reduces the movement of air both in and out of the roofing system.

An AVCL can be used effectively for both warm and cold roofing options.

What is a dew point?

The dew point is the temperature that water vapour in warm air turns back into water droplets. When warm air containing moisture rises, this will eventually cool and be unable to hold this moisture, causing condensation to build up on any component beneath this dew point.

An AVCL is installed to prevent the movement of this moist air, and to protect the other layers of the roofing build up.

Using an AVCL for warm roofing

A warm roof AVCL is positioned below the insulation, ensuring that the insulation and other structural elements are maintained at a temperature above the dew point. This design minimises the risk of condensation within the roofing structure.
This is particularly suitable for new construction projects, as it offers superior insulation and reduces the risk of moisture-related problems.

Using an AVCL for cold roofing

In a cold roof system, insulation is usually placed between the ceiling joists, and an AVCL can be installed on the warm side of the insulation to prevent warm, moist air from reaching the cold roof deck. This helps to prevent condensation and moisture-related issues.

What are the benefits of installing an AVCL?

There are a number of benefits and advantages to installing an AVCL for your roofing system. These include:

  • Improved moisture control- AVCLs act as a barrier against moisture, preventing condensation and water ingress. This is crucial in maintaining the structural integrity of the roof and preventing mould growth.
  • Energy efficiency- AVCLs play a vital role in the energy efficiency of a building. Warm roof AVCLs, in particular, help maintain a consistent indoor temperature by reducing heat loss through the roof.
  • Long-term durability- Roofing systems with AVCLs are known for their durability and long lifespan.
  • Compliance with building regulations- Many building regulations require the use of AVCLs to meet specific energy efficiency and moisture control standards.

For more information or advice about high quality roofing systems and the role of the AVCL, or for professional installation of your single ply roofing system, get in touch with the team today, here at Enviroply Roofing.