Roof Ballast Thickness

All membrane flashing and other detail work is completed.

Roof ballast thickness.

The stones are therefore much more substantial and hold up well under wind tunnel tests. In the field of the roof a minimum of 10 lbs s f. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses. Contact hydrotech for specific installation guidelines.

45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. For built up roofing the gravel was generally 25 5 inches in diameter. 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. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

Concrete pavers with smooth trowel finish min. Ballast is required with 20 lbs s f. Crushed gravel that must be graduated. Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation.

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

Needed at perimeters and at large penetrations.