Inverted Ballasted Roof

Roofs with pavers as ballast can be used as outdoor patios.

Inverted ballasted roof. The iko permatec inverted ballasted roof provides a protected membrane system which usually incorporates insulation. Benefits of inverted roofs. 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. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material.

It is however ballasted generally with gravel. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. Invented by dow in the late 1960 s an inverted roof system uses dupont styrofoam brand xps insulation to protect the membrane helping improve the performance and longevity of the entire roof system. 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.

Extremely difficult to find a leak in this system since the membrane is well hidden. Ballast stone traps a lot of dirt making patching difficult. Firestone epdm ballasted system application. 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.

Adds a lot of weight to the roof system typically 10 15 pounds per square feet. The total system usually weighs between 100 to 145 kg m2.