Proctor Air is a high-performance, vapour-permeable yet air-tight roofing membrane designed to enhance roof durability and thermal efficiency. It acts as a barrier against wind-driven rain, snow, and dust while allowing trapped moisture to escape, preventing condensation-related damage within the roof structure.

Manufactured by Proctor Group, a leader in building materials, this membrane is widely used in pitched and flat roofs across the UK and globally. Its advanced technology ensures long-term protection against weather while improving building energy efficiency.

Key Features of Proctor Air Roofing Membrane

1. Vapour Permeability

One of the standout features of Proctor Air is its high vapour permeability, which allows moisture trapped inside the building to escape. This reduces the risk of condensation buildup, which can lead to mould, timber rot, and insulation degradation.

2. Air-Tightness for Energy Efficiency

Unlike traditional breathable membranes, Proctor Air is designed to be air-tight. This prevents uncontrolled air leakage, which can lead to significant heat loss. By reducing air infiltration, the membrane enhances the effectiveness of insulation, making buildings more energy-efficient and compliant with Part L of UK Building Regulations.

3. Exceptional Weather Resistance

Proctor Air is engineered to withstand extreme weather conditions, providing superior protection against:

• Wind-driven rain
• Snow
• UV exposure
• Dust and airborne debris

Its durability ensures long-lasting performance without compromising breathability.

4. Compatibility with Modern Roofing Systems

This membrane is suitable for various roofing applications, including:

• Tiled and slated pitched roofs
• Warm and cold roof constructions
• Metal and standing seam roofs

5. Easy Installation

Proctor Air is lightweight and easy to install, making it an excellent choice for roofing contractors. It can be installed directly over insulation or onto timber rafters, offering flexibility in construction.

6. Compliance with UK Building Standards

Proctor Air meets the BS 5250:2021 standard for moisture control in buildings. It is also approved for use in NHBC(National House Building Council) projects, ensuring compliance with stringent UK construction guidelines.

Benefits of Using Proctor Air Roofing Membrane

✅ Prevents Condensation and Mould Growth

By allowing moisture to escape while keeping external moisture out, Proctor Air helps prevent structural damage caused by condensation.

✅ Improves Thermal Efficiency

Air-tight properties reduce energy loss, improving insulation efficiency and lowering heating costs.

✅ Increases Roof Longevity

Protects underlying materials from moisture damage, extending the lifespan of the roof structure.

✅ Enhances Indoor Air Quality

By controlling condensation and preventing mould growth, it contributes to a healthier indoor environment.

✅ Reduces Wind Uplift Risks

Provides a secondary layer of defence against wind-driven rain and extreme weather conditions.

Applications of Proctor Air Roofing Membrane

Residential Roofing

Perfect for homes seeking energy-efficient and durable roofing solutions.

Commercial & Industrial Buildings

Provides excellent thermal and weatherproofing benefits for large-scale construction projects.

Heritage & Conservation Projects

Ideal for historic buildings requiring breathable yet protective roofing solutions.

Metal Roofing Systems

Works well under metal standing seam roofs by preventing condensation buildup.

Why GNR Choose Proctor Air Roofing Membrane?

Proctor Air roofing membrane is a top-tier choice for modern roofing systems, offering superior moisture control, energy efficiency, and weather resistance. Whether for new builds, renovations, or heritage projects, its ability to improve roof performance makes it an ideal solution.

Further, for those looking to enhance their roofing system with a high-performance, durable, and compliant membrane, Proctor Air is an investment in long-term building protection and efficiency.

✅ Key Takeaway: Investing in Proctor Air roofing membrane ensures a safer, more energy-efficient, and longer-lastingroof, making it a top choice for homeowners and builders alike

A Guide for Conservation-Friendly Roofing

Bats are a protected species in the UK, playing a crucial role in our ecosystem by controlling insect populations. However, when undertaking roofing work, it’s essential to ensure that the materials used, particularly roofing membranes, do not harm bats. Certain modern breathable roofing membranes (BRMs) can be dangerous to bats, making it important to choose a bat-friendly alternative.

In this article, we explore which roofing membranes can be safely used in bat roosts, why some are harmful, and the best conservation-friendly practices for roof refurbishment.

Why Some Roofing Membranes are Dangerous for Bats

Modern breathable roofing membranes (BRMs) are designed to allow moisture vapour to escape while preventing water ingress. However, for buildings where bats roost, many standard BRMs pose serious risks:

Main Risks of Breathable Roofing Membranes (BRMs) for Bats:

Fibrous Structure Causes Bat Entanglement

• Many BRMs have a “fuzzy” or fibrous surface designed to trap water droplets while allowing vapour to escape.
• Bats, especially species like the brown long-eared bat, can get their claws tangled in these fibres, leading to injury or death.

Accumulation of Bat Fur and Droppings

• Over time, BRMs can accumulate oils, dirt, and bat droppings, reducing their breathability and causing condensation issues.
• This can lead to timber rot and structural damage.

Inconsistent Test Results

• Some manufacturers claim their BRMs are bat-safe, but current research suggests that NO BRM is truly safe for bats.
• Conservation groups like Bat Conservation Trust (BCT) and Natural England recommend avoiding BRMs in bat roosts.

Which Roofing Membranes Can Be Used in Bat Roosts?

The best bat-friendly roofing membranes are non-breathable, traditional bituminous felts (Type 1F felt or equivalent). These membranes have been used for decades and have no fibrous surface, making them safe for bats.