Roof Ballast Thickness

Needed at perimeters and at large penetrations.

Roof ballast thickness.

Then the membrane is installed over the loose laid rigid insulation. All membrane flashing and other detail work is completed. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. 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. The stones are therefore much more substantial and hold up well under wind tunnel tests. Crushed gravel that must be graduated. Concrete pavers with smooth trowel finish min.

Ballast is required with 20 lbs s f. 45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. Other thicknesses are also available for use in non roofing applications as a special order. Contact hydrotech for specific installation guidelines.

What are the available thicknesses and types of epdm single ply membrane. Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses.

In the field of the roof a minimum of 10 lbs s f.