Roof Ballast Thickness

Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

Roof ballast thickness.

Needed at perimeters and at large penetrations. What are the available thicknesses and types of epdm single ply membrane. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses. Concrete pavers with smooth trowel finish min.

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. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Then the membrane is installed over the loose laid rigid insulation. Finally the ballast stone or and pavers are laid down throughout the roof system.

Contact hydrotech for specific installation guidelines. In the field of the roof a minimum of 10 lbs s f. Other thicknesses are also available for use in non roofing applications as a special order. For built up roofing the gravel was generally 25 5 inches in diameter.

The stones are therefore much more substantial and hold up well under wind tunnel tests. Most roofers typically installed 10 15 pounds of ballast per square foot. 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.

45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing.