Roof Ballast Thickness

All membrane flashing and other detail work is completed.

Roof ballast thickness.

Ballast is required with 20 lbs s f. Concrete pavers with smooth trowel finish min. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. 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. 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. For built up roofing the gravel was generally 25 5 inches in diameter.

Then the membrane is installed over the loose laid rigid insulation. Other thicknesses are also available for use in non roofing applications as a special order. Most roofers typically installed 10 15 pounds of ballast per square foot. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses.

Contact hydrotech for specific installation guidelines. What are the available thicknesses and types of epdm single ply membrane. The stones are therefore much more substantial and hold up well under wind tunnel tests. Finally the ballast stone or and pavers are laid down throughout the roof system.

Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.