Roof Ballast Thickness

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

Roof ballast thickness.

Most roofers typically installed 10 15 pounds of ballast per square foot. Crushed gravel that must be graduated. Needed at perimeters and at large penetrations. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

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. Finally the ballast stone or and pavers are laid down throughout the roof system. The stones are therefore much more substantial and hold up well under wind tunnel tests. 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 used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Contact hydrotech for specific installation guidelines. Other thicknesses are also available for use in non roofing applications as a special order. 45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing.

Ballast is required with 20 lbs s f. In the field of the roof a minimum of 10 lbs s f. All membrane flashing and other detail work is completed. For built up roofing the gravel was generally 25 5 inches in diameter.

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