Roof Ballast Thickness

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

Roof ballast thickness.

Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Finally the ballast stone or and pavers are laid down throughout the roof system. Then the membrane is installed over the loose laid rigid insulation. For built up roofing the gravel was generally 25 5 inches in diameter.

What are the available thicknesses and types of epdm single ply membrane. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. The stones are therefore much more substantial and hold up well under wind tunnel tests. Most roofers typically installed 10 15 pounds of ballast per square foot.

Other thicknesses are also available for use in non roofing applications as a special order. In the field of the roof a minimum of 10 lbs s f. June 3 2018 epdm membrane is manufactured in various thicknesses 045 to 090 thick and is available as a non reinforced or reinforced sheet depending upon application. Crushed gravel that must be graduated.

Contact hydrotech for specific installation guidelines. 45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. Concrete pavers with smooth trowel finish min. 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.

Needed at perimeters and at large penetrations.