Cornwall
Products Used
Set within the sensitive Polperro Conservation Area, the refurbishment of Coastguard House and Cottages presented a complex challenge for Cornwall Housing Ltd. Subject to Article 4 planning restrictions, the project demanded a roofing solution that would preserve the character of the non-listed heritage buildings while delivering modern performance, durability and compliance for long-term social housing use.
Working alongside Mid Cornwall Roofing Ltd, the project team specified SSQ’s Riverstone Ultra Natural Slate as the only viable alternative to traditional Cornish slate. Early engagement with planning authorities was critical, with SSQ providing detailed quarry and material data to support the discharge of planning conditions. This ensured the selected slate met the strict requirements associated with Article 4 Direction, which protects the visual integrity and architectural significance of conservation areas.
Riverstone Ultra was also chosen to address the well-documented shortcomings of reclaimed slate, often used in heritage projects. Issues such as high-water absorption, inconsistent quality and accelerated weathering can compromise long-term performance. In contrast, Riverstone Ultra offers exceptional strength, low water absorption and consistent grading, ensuring both visual authenticity and reliability over time.
The project was delivered under SSQ’s Ultra Cover insurance-backed guarantee scheme, providing a comprehensive 10-year labour and installation warranty alongside a 100-year product guarantee.
The challenging installation required careful planning and technical precision due to the varied roof pitches across the site, ranging from 22 to 45 degrees. A pre-commencement review was undertaken to ensure compliance with SSQ’s monitored installation requirements, particularly in low-pitch areas. Slates were installed on 50 x 25mm battens, typically at a 200mm gauge. On lower pitches, this was reduced to 130mm, with slates pre-holed by SSQ to ensure accuracy and performance.
Ventilation and detailing were equally critical. Over-fascia vents, continuous vented ridge systems and discreet in-line slate vents were incorporated to manage airflow and mitigate condensation risk. Existing roof elements, including gutters, fascias and bargeboards, were carefully removed, refurbished and reinstated. A retrofitted aluminium dry verge system was introduced behind the original detailing, preserving the building’s traditional appearance while enhancing weather resistance.
Access to the site proved challenging due to narrow approach routes, requiring materials to be delivered and loaded daily via scaffold. Seasonal spring storms added further complexity, yet the experienced SSQ-approved installers ensured the roof remained fully watertight throughout so that tenants were protected whilst they remained in residence.
Additional upgrades included the replacement of lead valleys, chimney flashings and the careful reinstatement of roof windows to accommodate increased batten depths. These interventions were carried out in line with current standards while respecting the existing structure.
Completed on time and to budget, the project was delivered to the requirements of Cornwall Hosing Ltd. Coastguard House and Cottages now stand as a robust example of how SSQ’s Riverstone Ultra can successfully navigate the demands of conservation-led refurbishment, combining planning compliance, technical excellence and long-term assurance for one of Cornwall’s most distinctive coastal communities.
