Roof Ballast Stone Size

Stone ballast is no longer allowed by many building codes.

Roof ballast stone size.

Pavers however are still acceptable. 4 1 the wind resistance of ballasted membrane roof systems is determined largely by the size and weight of the ballasted used. Roofing southwest a ballast system helps cut roof system application costs as it takes less time to install since sealing the layers together isn t necessary. 1 3 4 x11 4 size 4.

4 per astm d448 standard sizes of coarse aggregate or astmd7655 d7655m 12 standard classification for size of aggregate used as ballast for membrane roof systems or. Ton or 60lbs bags. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Roofing stone is available in 1 1 1 2 roof ballast and 3 8 washed pea stone.

1 3 4 x11 4 size 4. Ansi spri rp 4 provides a method for the wind design of ballasted single ply membrane roof systems and includes specific guidelines for the size and weight of aggregate used as ballast. Schofield tennessee wholesale products. Astm d 1863 crushed limestone white.

Tan grey. Due to variations in monitor settings we cannot guarantee that the colours displayed on our website will exactly match the colour of the product. If roof weight isn t a concern and aesthetics are a priority consider a ballasted roof. This will permanently remove the record from.

White ballast a1 grit ballast is a natural smooth water worn and screened large gravel used for many applications. Just be warned that over time as leaks start to occur it will. Schofield pennsylvania blue stone. 2 1 ballast in roofing ballast comes in the form of large stones typically river bottom stone in.

3 roofing ballast astm d 448. The key reason for developing rp 4 was to eliminate improper use of stone ballast. Bagged stone by garden rock. 4 roofing ballast astm d 448.

Astm d 448 naturally rounded off white and beige quartzite. In many cases ballasted roofing also uses pavers in places of heavy traffic or even over the entire surface of the roof. In windy areas ballast stone can actually blow off the roof creating projectiles below. Ballast stones are usually one to two inches thick and applied more generously than on a built up roof.

Used in roofing applications. Astm d 448 naturally round grey and tan granite. The heavier stones provide substantial protection against wind gusts. Ton or 60lbs bags.

The stones are therefore much more substantial and hold up well under wind tunnel tests. Designed to be used on flat rooftops. The wind performance of this material was extensively studied in wind tunnels and by field inspections during the 1970s and 1980s resulting in the development of ansi spri rp 4. The stone used for single ply ballast has been sized using astm d448.