Roof Ballast Thickness

Then the membrane is installed over the loose laid rigid insulation.

Roof ballast thickness.

The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer. Needed at perimeters and at large penetrations. Crushed gravel that must be graduated. Epdm roof membrane comes in rolled sheets that are wide and long and manufactured in three common thicknesses.

The stones are therefore much more substantial and hold up well under wind tunnel tests. 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. All membrane flashing and other detail work is completed.

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. Contact hydrotech for specific installation guidelines. What are the available thicknesses and types of epdm single ply membrane.

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. Finally the ballast stone or and pavers are laid down throughout the roof system. Most roofers typically installed 10 15 pounds of ballast per square foot. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm.

Ballast is required with 20 lbs s f.