Proctor Procheck® Adapt - Variable Permeability VCL (1.5m x 50m)

• Variable resistance adapts to changes in humidity
• Wide Sd range guarantees performance in demanding
climatic conditions
• Ensures effective drying out of building materials
• Suitable for variety of commercial and residential
applications
• Provides airtightness to structure as well as vapour
control
• Translucent material allows for ease of installation onto
framework

What is Procheck Adapt?

Procheck Adapt is a variable–permeability vapour control layer (VCL) that protects the building fabric from condensation risk while also providing an effective airtight barrier. Its design adjusts vapour resistance based on humidity conditions, making it an intelligent membrane choice for modern construction.

How does Procheck Adapt work?

Procheck Adapt’s vapour resistance changes depending on humidity levels and temperature – it becomes more vapour resistant in cold, humid conditions and more vapour permeable in warm, drier conditions. In a temperate climate such as in the UK, this helps protect the structure from interstitial condensation in winter (when the risk is greatest) and supports effective drying in summer.

Where is Procheck Adapt typically used?

Procheck Adapt is suitable for a wide range of commercial and residential applications, including roof, wall and floor buildups where vapour control and airtightness are required. It is particularly advantageous on solid masonry walls, which store a lot of moisture. The variable nature of the membrane helps reduce the water content of the wall by allowing it to dry back into the room when conditions allow.

Does Procheck Adapt help with moisture management?

Yes – its variable permeability supports moisture regulation throughout the year, allowing internal moisture to be controlled and drying to occur when conditions are favourable. This contributes to the long–term health of the building fabric.

Is Procheck Adapt airtight?

Yes – Procheck Adapt also functions as an airtight layer, helping reduce unwanted air leakage and contributing to improved energy performance. It is even certified as an airtightness component by the Passive House Institute.

What are the key benefits of Procheck Adapt?

• Variable permeability adapts to changes in humidity.
• Wide Sd range provides performance across differing climatic conditions.
• Supports effective drying out of building materials.
• Airtight construction support for energy efficiency.
• Translucent structure aids fast fixation to structural frames.

Does Procheck Adapt have any features to aid installers on site?

Yes – the membrane’s translucent finish means that structural frames can be seen through it, assisting with alignment and fixing. We also supply an illustrated installation guide to demonstrate each step and identify common issues.

What sizes is Procheck Adapt available in?

Procheck Adapt typically comes in 1.5 m × 50 m rolls, covering approximately 75 m² per roll, with options for other widths such as 3 m available.

Does Procheck Adapt have certification?

Yes – Procheck Adapt is recognised as a Passive House Institute certified component for airtightness (Component ID 1611as00), offering confidence in performance for high–efficiency design standards.

Can Procheck Adapt be used in different climates?

Yes – its wide Sd range and variable permeability mean it is suitable across a range of climatic conditions, adapting vapour control to seasonal humidity changes.

Is technical support available?

Yes – comprehensive technical guidance, specification support and installation advice are available to help ensure Procheck Adapt is used correctly on your project. We can run hygrothermal simulations via the WUFI software, which can be especially useful in showing how solid stone walls can dry out.