Roof Ballast Thickness

The stones are therefore much more substantial and hold up well under wind tunnel tests.

Roof ballast thickness.

Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Contact hydrotech for specific installation guidelines. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. For built up roofing the gravel was generally 25 5 inches in diameter.

Then the membrane is installed over the loose laid rigid insulation. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses. 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.

45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. 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. In the field of the roof a minimum of 10 lbs s f. What are the available thicknesses and types of epdm single ply membrane.

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. All membrane flashing and other detail work is completed.

Crushed gravel that must be graduated.