Arun Projects Apartments

Published on 8th June 2019
Arun Project
  • Division: Flat Roofing
  • Client: Arun Projects
  • Location:
  • Sector: Commercial

Avonside Cobsen-Davies branch successfully completed a single ply roofing project on apartment buildings for Arun Projects, the Main Contractor.

The Project:

Sarnafil G410-15EL in light grey was mechanically fixed with heat welded laps. The effective thickness of the main covering was 1.5mm with a standard lacquered finish. The Sarnafil G410-15EL membrane was mechanically fixed to all upstands including peel stop bars and stainless-steel fixings as per manufacturer’s recommendations. The upstands had to be no lower than 150mm in height to conform with manufacturer’s recommendations.

Sarnafil 500E, a polythene Vapour Control Layer, was applied to the timber deck. SarnaTherm S 140mm foil faced flat insulation board was also mechanically fixed through to the timber deck using Sarna fixing plates and carbon fixings. (Achieving a U-Value of 0.15 W/m2K).

In addition, 2nr Sarnafil rainwater scupper box outlets were fixed and sealed to main field area and Sarnafil SarnaTred 600 x 600 walkway tiles were glued and welded to main field area.

As well as fixings from Sarna Fixings, other products used included powered coated aluminium copings from manufacturer Skyline that were made bespoke to suit. They were measured and pressed to suit various widths of parapet and then powder coated to ensure the finish met the client’s RAL requirements. The aluminium element of the Skyline Coping used ensured the durability and longevity of the Coping, with the life expectancy of aluminium being up to 40 years in rural/suburban areas and up to 25 years in industrial/marine areas. Aluminium is also 100% recyclable.

20nr Sun pipes, 16 “Light weight 250” and 4 “Light weight 520”, from manufacturer Lightway were also installed by our in-house sheeting and cladding team.

Upon completion of the project, Avonside Cobsen-Davies, issued a 20-year amortised product and workmanship guarantee on project completion.


It was specified in the original Bill of Quantity that Avonside Cobsen-Davies install a solar master solartube. These sun tubes, although not entirely new, are still regarded as innovative in the sense that they provide natural daylight rather than artificial light and are eco-friendly. Due to the reflective layers from the pure silver and glass light diffuser, the sunlight delivered through the sun tubes doesn’t lose its natural colouring and behaviour

As Lightway state on their website, natural sunlight can impact a person’s mood for the better (sunlight stimulates the production of serotonin in the body that makes people feel happier), supports the ability to learn and can influence people’s performance.

To reduce their carbon footprint throughout the project, Avonside Cobsen-Davies took measures to cut the number of vehicle movements by maximising bulk deliveries and engaging labour in Portsmouth so that workers were local to the site. They also complied fully with the Main Contractor’s waste management plan.

Health and Safety

Safety is always a top priority for Avonside and was maintained by using trained and competent labour. Risk Assessment and Method Statements (RAMS) were issued to the Main Contractor for approval and the operatives were subsequently inducted into the RAMS. Operatives were made aware of what potential risks were on the project and how works were to be planned and carried out. The health and safety process and risk management were monitored by a combination of the Charge Hand, the Main Contractor’s Site Manager and Avonside’s visiting Construction Management personnel.