Roof Ballast Thickness

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

Roof ballast thickness.

Other thicknesses are also available for use in non roofing applications as a special order. Crushed gravel that must be graduated. 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.

Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Needed at perimeters and at large penetrations. Ballast is required with 20 lbs s f. For built up roofing the gravel was generally 25 5 inches in diameter.

Concrete pavers with smooth trowel finish min. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. The stones are therefore much more substantial and hold up well under wind tunnel tests. Contact hydrotech for specific installation guidelines.

Then the membrane is installed over the loose laid rigid insulation. All membrane flashing and other detail work is completed. Most roofers typically installed 10 15 pounds of ballast per square foot. Finally the ballast stone or and pavers are laid down throughout the roof system.

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