A range of high performance breathable roof underlays for cold and warm roof application.

SDS
TDS

DOP

CE
UKCA

Vent3® EXCEL 190.
Ultra Heavyweight performance breathable underlay.

Weighing in at 190gsm, this premium roofing felt is BS5534 compliant, ensuring it meets the highest standards of wind uplift resistance and weather protection. Designed with breathability in mind, it provides effective moisture management, preventing condensation and ensuring the longevity of your roof.

Vent3 Excel is a high-density, durable, triple-layer fabric and high-performance breather membrane, made from high-tensile spun-bonded polypropylene layers surrounding a microporous polypropylene film. Designed for use as a universal breather membrane for roofs and walls boasting superior moisture vapour permeability. Vent3 Excel has a printed light blue upper surface with preprinted marking lines and a white under-face. The high vapour permeability and waterproof properties of the membrane, combined with excellent tensile/tear strength, make Vent3 Excel an ideal product for use in all pitched roof applications. It will allow the escape of water vapour from within the roof structure whilst protecting against wind driven rain, snow and dust which may penetrate the main roof waterproofing, providing a permanent quality breather underlay, which will last the life of the roof construction.

Colour Size Product Code Pallet Qty Barcode  

Light
Blue		 1m x 50m TV3E/50 56 5036684023757 • Warm Roof Non Ventilated
& Cold Ventilated
• Cold Non Ventilated
SDS
TDS

DOP

CE
UKCA

Vent3® PRO.
Heavyweight performance breathable underlay.

The Vent3 Pro 165gsm Breather Felt is a robust and versatile membrane, designed to offer high levels of protection and breathability for pitched roof and wall installations. Weighing 165gsm, this heavy-duty felt is crafted from three durable layers, providing excellent water resistance while allowing internal moisture to escape, helping prevent condensation buildup.

Colour Size Product Code Pallet Qty Barcode  

Green		 1m x 50m
1.5m x 50m		 TV3P/50
TV3P/75		 56
48		 5036684004138
5036684004145		 • Warm Roof Non Ventilated
& Cold Ventilated
• Cold Non Ventilated
SDS
TDS

DOP
CE
UKCA

Vent3® 
High performance breathable underlay.

The Vent3 135gsm Breather Felt is a mid-weight yet durable membrane designed to provide reliable protection and breathability for pitched roofs and wall applications. With a weight of 135gsm, it strikes the perfect balance between strength and ease of installation, ensuring excellent performance in preventing water ingress while allowing internal moisture to escape, reducing the risk of condensation.

Colour Size Product Code Pallet Qty Barcode

Blue		 1m x 25m
1m x 50m
1.5m x 50m		 TV3/25
TV3/50
TV3/75		 104
56
48		 5036684003926
5036684002974
5036684003193		 Warm Roof Non Ventilated
& Cold Ventilated
Cold Non Ventilated
SDS
TDS

DOP
CE
UKCA

Vent3® Classic
High performance breathable underlay.

The Vent3 Classic 115gsm Breather Felt is a lightweight yet durable membrane, designed for effective roof and wall protection in pitched construction projects. With a weight of 115gsm, it offers excellent breathability, allowing moisture to escape from the building while providing reliable resistance to water ingress.

Colour Size Product Code Pallet Qty Barcode

Grey		 1m x 25m
1m x 50m
1.5m x 50m		 TV3C/25
TV3C/50
TVC3/75		 104
56
48		 5036684003902
5036684003216
5036684003209		 Warm Roof Non Ventilated
& Cold Ventilated
Cold Non Ventilated

Vent3® Classic Xtra
Taped performance breathable underlay.

The Vent3 Classic Xtra Integral Tape Breather Felt is a high-performance, multi-layer membrane featuring integrated adhesive tape for enhanced ease of installation and superior sealing. Designed for pitched roofs and wall applications, this advanced breather felt provides excellent breathability, allowing moisture to escape from the structure while preventing water ingress. The integral tape ensures a secure, seamless finish, improving wind uplift resistance and overall weatherproofing.

Colour Size Product Code Pallet Qty Barcode

Grey		 1m x 50m IV3C/50 56 – Warm Roof Non Ventilated
& Cold Ventilated
Cold Non Ventilated
SDS
TDS

DOP

CE
UKCA

Vent3® Light
Lightweight performance breathable underlay.

The Vent3 Light 95gsm Breather Felt is an ultra-lightweight yet efficient membrane designed for roof and wall applications where breathability and protection are essential. At 95gsm, this breather felt allows moisture to escape from the structure while providing reliable water resistance, reducing the risk of condensation buildup. Its lightweight design ensures easy handling and quick installation without compromising on durability.

Colour Size Product Code Pallet Qty Barcode

Dark Grey		 1m x 25m
1m x 50m
1.5m x 50m		 TV3L/25
TV3L/50
TV3L/75		 104
56
56		 5036684003889
5036684003834
5036684003841		 Warm Roof Non Ventilated
& Cold Ventilated
Cold Non Ventilated

The roofing industry constantly seeks advancements in materials that provide both protection and ventilation to prevent common issues such as condensation, mould growth, and structural damage. Traditional non-breathable roofing felts often trap moisture within roof structures, leading to these problems. There was a significant demand for roofing solutions that could offer effective weather resistance while allowing trapped moisture to escape.

Solution:
Cromar Building Products responded to this challenge by developing a range of high-performance breathable roofing felts. These products are designed to provide superior weatherproofing and ventilation, addressing the issues associated with traditional roofing materials.

Product Development:
Cromar’s development team focused on creating roofing felts that combine durability, ease of installation, and breathability. The result was a series of innovative products, including:

Vent3 Light: A lighter version designed for use in roofs where weight is a critical factor but without compromising on breathability and protection.

Vent3 Classic: A triple-layered breathable membrane that provides excellent protection against wind and rain while allowing moisture to escape, reducing the risk of condensation.

Vent3: A heavy weight breathable membrane robust for all roof and wall applications.

Vent3 Pro: A professional-grade breathable felt that offers enhanced durability and performance for demanding applications.

Vent3 Excel 190: An Ultra Heavyweight breathable felt that offers enhanced durability and performance for demanding applications.

Features and Benefits:
High Breathability: These felts are engineered to allow moisture vapour to escape from the roof structure, preventing condensation build-up and protecting the integrity of the building.

Weather Resistance: Made with robust materials, the felts provide excellent resistance to wind and rain, ensuring long-term protection for the roof.

Ease of Installation: Lightweight and flexible, Cromar’s breathable felts are easy to handle and install, saving time and labour costs. Please refer to our installation guidance along with the relevant installation requirements from the BBA, NHBC in accordance with BS5534:2014+A2:2018, BS 5250 and BS8000-6 :2023.

Energy Efficiency: By preventing moisture build-up and promoting a healthier roof environment, these felts contribute to better insulation performance and energy efficiency.

Results:
Customer Satisfaction: Feedback from contractors and homeowners has been overwhelmingly positive, highlighting the superior performance and ease of installation of Cromar’s breathable felts.

Market Growth: Cromar has seen a significant increase in market share within the roofing sector, establishing themselves as a leader in breathable roofing solutions.

Sustainability: By reducing the risk of moisture-related damage, Cromar’s breathable felts contribute to the longevity and sustainability of buildings, aligning with industry trends towards more sustainable construction practices.