Roof Ballast Thickness

For built up roofing the gravel was generally 25 5 inches in diameter.

Roof ballast thickness.

Crushed gravel that must be graduated. Gravel in form of round smooth river washed aggregate without broken pieces nominal 16 to 32 mm. Then the membrane is installed over the loose laid rigid insulation. The stones used in ballasted roofing are generally 1 5 2 5 inches in diameter and applied in a thicker layer.

Typically requires crushed graded stone placed over a stone filter sheet rolled out over the insulation. Contact hydrotech for specific installation guidelines. 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. Most roofers typically installed 10 15 pounds of ballast per square foot.

The stones are therefore much more substantial and hold up well under wind tunnel tests. Ballast is required with 20 lbs s f. 45 mil epdm rubber roofing 60 mil epdm rubber roofing 90 mil epdm rubber roofing. In the field of the roof a minimum of 10 lbs s f.

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

Finally the ballast stone or and pavers are laid down throughout the roof system.