Inverted Ballasted Roof

Inverted roofs are designed with the waterproofing layer usually a liquid applied membrane beneath the insulation.

Inverted ballasted roof.

It is however ballasted generally with gravel. Firestone epdm ballasted system application. 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. 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.

Benefits of inverted roofs. Roofs with pavers as ballast can be used as outdoor patios. 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. A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material.

Extremely difficult to find a leak in this system since the membrane is well hidden. Drawbacks of a ballasted 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. The iko permatec inverted ballasted roof provides a protected membrane system which usually incorporates insulation.

Adds a lot of weight to the roof system typically 10 15 pounds per square feet. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast.