Roof Ballast Thickness

Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses.

Roof ballast thickness.

In the field of the roof a minimum of 10 lbs s f. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

Most roofers typically installed 10 15 pounds of ballast per square foot. Crushed gravel that must be graduated. For built up roofing the gravel was generally 25 5 inches in diameter. 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.

Other thicknesses are also available for use in non roofing applications as a special order. What are the available thicknesses and types of epdm single ply membrane. 45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. Needed at perimeters and at large penetrations.

Ballast is required with 20 lbs s f. 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. The stones are therefore much more substantial and hold up well under wind tunnel tests. Then the membrane is installed over the loose laid rigid insulation.

Contact hydrotech for specific installation guidelines.