Permarock Roofline Closure Systems
PAS-compliant solutions for protecting insulated render systems on retrofit projects where extending the roofline is not feasible.
Government Approval
UK Government reinstated the use of Roofline Closure Systems for PAS-compliant retrofit projects in August 2024, ending a four-year ban.
Standard Details
13 standard design details in the Weathering Guide
Compliance
PAS 2030/2035 & TrustMark lodgement compliant
Policy Background
A ban introduced under PAS 2035:2019 and PAS 2030:2023 had prohibited metal or plastic cappings at eaves and verges for four years, after industry failures with traditional verge trims. This left roofline extensions as the only option for properties with insufficient roof overhangs — expensive and often impractical for mid-terrace homes — excluding many households from retrofit programmes. The NIA, SWIGA, and INCA formed a working group with Government, BSI, the Retrofit Standards Task Group, and TrustMark to develop new Design Principles and an updated Weathering Guide, enabling the safe reintroduction of Roofline Closure Systems.
WHAT WE OFFER
Products & Technical Support
We offer products and technical support to ensure clients can develop PAS-compliant solutions that meet TrustMark’s lodgement requirements. Our systems meet all relevant material specification requirements and can be configured to suit properties of different archetypes and environments. We also provide appropriate training for registered installers.
PAS Compliant
Fully compliant with PAS 2030/2035 standards and TrustMark lodgement requirements, supporting retrofit programme eligibility.
Quick Installation
Designed for efficient site installation, reducing labour time and programme disruption compared to full roofline extensions.
Thermal Protection
Provides effective thermal protection and actively prevents thermal bridging at critical eaves and verge junctions.
Secure & Resilient
Engineered for long-term durability in exposed environments, maintaining weathertight performance over time.
Mid-Terrace Friendly
Practical for mid-terrace and other properties where roofline extensions are not architecturally or structurally feasible.
Installer Training
Permarock provides accredited training for registered installers to ensure correct specification and installation every time.
ACHIEVING COMPLIANCE
Routes to Compliance
There are two routes via which Retrofit Designers can develop PAS-compliant designs using Roofline Closure Systems.
Standard Design Details
Use one of the 13 standard details included in the official Weathering Guide (August 2024). These pre-approved details provide a straightforward path to compliance for common property archetypes and conditions.
13 details available in the Weathering Guide
Bespoke Design Approach
Apply the core Design Principles when developing bespoke retrofit designs to suit individual projects and archetypes. This route accommodates unique or non-standard properties where the standard details may not directly apply.
Design principles detailed in our product brochure
KEY FEATURES AT A DISTANCE
PAS 2030/2035 compliant
Quick and efficient installation
Effective thermal protection
Prevention of thermal bridging
Secure and resilient systems
Supports TrustMark lodgement
Installer training provided
Configurable for different archetypes
LITERATURE & GUIDANCE
Downloads
View and download our Roofline Closure Systems brochure and the August 2024 update of the official External Wall Insulation Specification for Weathering and Thermal Bridge Control Guide.
PRODUCT BROCHURE
Permarock Roofline Closure Systems Brochure
Comprehensive product information, design principles, system configurations and installation guidance for retrofit designers and installers.
OFFICIAL GUIDANCE
Weathering Guide — August 2024 Update
The official External Wall Insulation Specification for Weathering and Thermal Bridge Control Guide, including the 13 standard design details.
