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Bituminous Membranes

StressPly Evolution

This elastomeric bitumen membrane flat roof system delivers exceptional flexibility and strength across diverse waterproofing applications. Advanced formulation provides superior thermal stability, mechanical resilience, and anti-ageing properties for long-term building protection.

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Mask Aerial view of primary school with black roof and colorful playground equipment

High tensile strength

1000 N/50mm (longitudinal) · EN 12311-1 · exceeds the 750 N/50mm BS 8747 threshold.

Waterproofing

Watertight at a head of at least 60 kPa · EN 1928.

Fire performance

BROOF(t4) · EN 13501-5.

Low-temperature flexibility

Cold flexibility to −25°C · EN 1109.

Long service life

30+ years, BBA-assessed · certified for blue roof / SUDS use · BBA 20/5800.

Why specify StressPly Evolution?

Worker installing black waterproof membrane with UV protection coating

Recycled content

Manufactured using recycled polymers, supporting circular economy objectives and project sustainability targets.

Close-up of reinforced cardboard layers showing concentric circular patterns and texture detail.

Reinforced durability

Composite reinforcement enhances dimensional stability, puncture resistance and long-term membrane performance.

Worker using torch to seal bituminous roofing membrane on flat roof surface

Thermal flexibility

Engineered to accommodate thermal movement while maintaining flexibility across seasonal temperature fluctuations.

Blowtorch applying flame to roofing membrane installation on wet surface

Multi-layer protection

Built-up waterproofing assembly provides resilient protection through multiple waterproofing layers.

System Components

Multi-layer engineered protection system

StressPly Evolution

Mineral Cap Sheet

UV protection and weatherproofing

Mineral slate granule finish with thermo-fusible installation film. Suitable for warm and inverted roof applications.

Rolled black bituminous membrane with gray granular surface against blue sky

Torch Evolution Base Sheet

Reinforced Underlayment

Polyester reinforcement with SBS modifiers delivers exceptional tear and puncture resistance.

Rolled black bituminous base sheet material against clear blue sky

Torch Evolution VCL

Air and Vapour Control Layer (AVCL)

Prevents condensation damage

SBS modified vapour barrier stops water vapour infiltration that causes system failure.

Rolled black Torch Flex vapour barrier membrane with branding visible

Quick Reference

LayerTensile strength - L/T (N/5cm)
Thickness (mm)Low Temp. Flex (°C)Length (m)
Width (m)
StressPly Evolution1000/8004.6-2561.0
Torch Evolution Base Sheet850/6504.0-1581.0
Torch Evolution VCL
600/4003.0-20101.0

Need specification advice?

Your local Garland UK Technical Manager can help assess your roof, develop the appropriate specification, and recommend the right StressPly system for your project.

Find your Technical Manager

Read about our
systems in action.

Discover how we’ve transformed buildings across every sector, delivering lasting protection and peace of mind to our clients.

Fabric-first retrofit supporting RNCM’s decarbonisation strategy

The Royal Northern College of Music (RNCM) undertook a major decarbonisation programme while remaining fully operational, placing significant pressure on its existing building fabric to perform better, not just differently. With energy demand rising and long-term resilience a priority, a fabric-first approach sat at the heart of the strategy, with the roof identified as a critical opportunity to deliver meaningful and measurable thermal performance gains.

Find out more
Aerial view of Royal Northern College of Music building with extensive rooftop solar panels

Targeted Roof Retention Saves £150,000 at Riverside Mansions

Technical Manager Alex Kitis partnered with the client team to deliver a retention-led roof refurbishment at Riverside Mansions, avoiding full roof replacement and reducing project costs…

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Aerial view of Riverside Mansions residential complex with modern roof extension and parking area

Roofing and Solar PV Under One Guarantee

Towers School in Ashford, Kent, embarked on the critical refurbishment of a core teaching block, where extensive roof failure was beginning to disrupt learning environments. In partnership with Richard Carré of Carré, an expert consultant and building surveying firm, Garland UK was appointed to deliver a complete building envelope solution, aiming to restore waterproofing integrity, improve thermal efficiency in line with regulatory targets, and reduce long-term energy costs through the integration of solar technology.

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Aerial view of school building with extensive solar panel installation on roof

Green Plan in Action For Hospital Roof Refurbishment

Technical Manager Jack Costello worked with the NHS Trust to enhance thermal efficiency and align with their Green Plan commitment to achieving net-zero carbon emissions by 2040…

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Aerial view of hospital building with solar panels and green roof areas

Seamless Pitch-to-Flat Conversion for School

Technical Manager Daniel Sandell worked with Synergy Construction, converting a school’s leaking metal pitched roof into a durable, multi-layered bituminous membrane flat roof system

Find out more
Aerial view of school building with extensive rooftop solar panel arrays installed
Garland UK
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