Inverted Ballasted Roof

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.

Inverted ballasted roof. Roofs with pavers as ballast can be used as outdoor patios. Benefits of inverted roofs. Drawbacks of a ballasted roof system. Ballast stone traps a lot of dirt making patching difficult.

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

A ballasted roof means that the roof membrane is not anchored or adhered in any way to the decking material. Insulation boards are loose laid on top of the membrane and then weighted down with paving slabs or gravel ballast. The total system usually weighs between 100 to 145 kg m2. Firestone epdm ballasted system application.

Adds a lot of weight to the roof system typically 10 15 pounds per square feet. The iko permatec inverted ballasted roof provides a protected membrane system which usually incorporates insulation.