Inverted Ballasted Roof

The firestone epdm ballasted system is an economical epdm roofing system suitable for a wide variety of buildings it can be applied on any building that can accommodate the extra load of the ballast and where the roof slope does not exceed 10.

Inverted ballasted roof.

Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation. Roofs with pavers as ballast can be used as outdoor patios. Extremely difficult to find a leak in this system since the membrane is well hidden.

Firestone epdm ballasted system application. An inverted roof also known sometimes as a protected membrane or pmr roof uses the same materials as a conventional roof but places insulation on the top of the membrane. When the concept first came to the u s plenty of roofers scratched their heads and wondered how the roof stayed on without being anchored especially during high winds or storms. The total system usually weighs between 100 to 145 kg m2.

A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Iko permatec is fully bonded to the structural deck and covered by insulation xps or modified eps which is covered by a separation layer and a ballast of stone pebbles or concrete pavers. Adds a lot of weight to the roof system typically 10 15 pounds per square feet. It is however ballasted generally with gravel.

Ballast stone traps a lot of dirt making patching difficult. Drawbacks of a ballasted roof system.