17th February 2020

ROOFING SYSTEM ADDRESSES LEAKAGE PROBLEM

Belzona (Harrogate, UK, and Miami, FL) uses a combination of its 3000 series materials to deal with deteriorated roofs. While the principle involved is hardly new, the materials combination is.

At a large housing development in the UK, a number of weathering problems were identified on a series of 28 flat roofs that were deteriorating to varying degrees. In some areas, failing mineral felt and cracked asphalt substrate had led to water ingress, and in others, mortar between parapet coping stone joints was failing, allowing water to penetrate through the brickwork below. On some parapets, strips of flashing tape had been installed over the coping stones joints to seal them but these had started to fail and required replacement.

Following an inspection by a Belzona representative, a cold applied liquid coating for long-term roof protection, Belzona 3111 flexible membrane was specified to repair the damage. This coating was prescribed in conjunction with Belzona 9311 reinforcing sheet, a specially woven, open mesh fabric designed to give added durability and strength.

In addition, Belzona 3911 PSC surface conditioner, to prepare porous surfaces prior to application, was also specified, while Belzona 3921 GSC surface conditioner was chosen to prepare non-porous areas.

All surface water, fungal growths, vegetation and loose debris were cleared away from the application area prior to conditioning. The failed flashing strips were also removed.

To deal effectively with preparation of the entire roof, the team was split into groups. Two workers were assigned to clear debris, while another begun to lay down a conditioning coat.

After all debris was cleared, the Belzona conditioners were applied with a roller to provide a quick coverage. Once the conditioner had dried, reinforcement sheet was laid out and coated with Belzona 3111. A soft bristled brush was used to apply this material, smooth over the system for complete wetting and to leave a finish free from stretches or creases.

For larger spaces, one square-meter rolls of reinforcement sheet were used. One person was in charge of setting up reinforcement, placing a thin coat of Belzona 3111 over any joints or gaps, while another rolled product on the top.

Once the system was thoroughly dry, which in most areas took two to four hours, and 24 hours in areas subjected to standing water, the second layer of Belzona 3111 was applied. This final layer achieved a smooth finish free from pinholes.

In each area, different obstacles arose. As the application areas were part of a fully functioning building, air conditioning units, satellite dishes and pipes were all attached to the surface. To ensure the functionality of Belzona 3111 wasn’t compromised, any equipment attached to the roof itself was included in the coating.

Due to the versatility of the system, the application team was able to facilitate tailored repairs for each different application situation. The tough, flexible and elastic polymeric film tightly follows all roof contours, encapsulating and providing long-lasting protection to every area of the roof.

www.belzona.com