Pebble Ballast Roof

Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

Pebble ballast roof.

Bur s and ballast roofing systems brs s are topped with rocks. Holes mean roof leaks and roof leaks mean call the roofer. But the former uses a very thin layer of crushed stone or pea gravel that is not larger than 1 4th inch in diameter. The gravel ballast secures the roof waterproofing against wind uplift forces.

Single ply roofing materials aren t self adhered nor are they sealed together in any way. Seagulls causing considerable damage to pebble ballast roofing the royal cornwall hospital has recently had a new health wellbeing centre built with a rooftop that housed decorative pebbles known as ballast or pebble ballast roofing. Intended to be used solely as a covered roof membrane restrained against wind uplift forces by the dead weight of ballast. This is partially embedded into a topcoat of asphalt in order that it be protected from the sun s uv rays.

These were proving to be a hit with the existing resident seagulls. Ballasted roofs have become more popular as designers and users look to utilise the roof space. Despite the positive qualities associated with a ballasted roof system there are some challenges. Ballast is commonly used with roofs made of tar and gravel roof alternatives including ethylene propylene diene monomer epdm polyvinyl chloride pvc and thermoplastic polyolefin tpo single ply flat roofs.

A homogenous sheet with the addition of a layer of random glass fibres in the middle of its thickness which is designed to virtually eliminate shrinkage and provide the necessary dimensional stability. The buildup is ballasted with a gravel layer of at least 50 mm and 80 kg m 2. The primary concern for sarnafil is ensuring that the roof design meets all the aesthetic requirements whilst providing waterproofing for the roof. Roof perimeters and penetrations are flashed in accordance with firestone specifications pdf.

The gravel top coat is also extremely resilient to heavy foot traffic and high wind scenarios. Somebody walking on the roof will undoubtedly step on the ballast and put a hole in the membrane. Once completed the epdm membrane is held in place using one of the following materials as ballast with a minimum weight of 50 kg m. Ballasted roofs can be living green roofs brown roofs paved stone or indeed a combination.

Ballasted roof systems are simultaneously a roofer s best friend and arch nemesis.