Roof Ballast Thickness

The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.

Roof ballast thickness.

Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Then the membrane is installed over the loose laid rigid insulation. For built up roofing the gravel was generally 25 5 inches in diameter. Finally the ballast stone or and pavers are laid down throughout the roof system.

In the field of the roof a minimum of 10 lbs s f. Contact hydrotech for specific installation guidelines. Most roofers typically installed 10 15 pounds of ballast per square foot. 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.

What are the available thicknesses and types of epdm single ply membrane. Needed at perimeters and at large penetrations. Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Other thicknesses are also available for use in non roofing applications as a special order.

The stones are therefore much more substantial and hold up well under wind tunnel tests. Concrete pavers with smooth trowel finish min. All membrane flashing and other detail work is completed. Crushed gravel that must be graduated.

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.