Roofing FAQ

What is the VOC content of Monolithic Membrane 6125 (MM6125)?

The Volatile Organic Compound (VOC) content of Monolithic Membrane 6125 (MM6125) is zero (0). MM6125 contains no VOCs.

Can Monolithic Membrane 6125-FR be applied on plywood, cement or gypsum boards?

Yes, Monolithic Membrane 6125-FR can be applied on plywood, cement, or gypsum boards. The primary acceptable substrates for Hot Applied Rubberized Asphalt are concrete, gypsum/cement type boards, and wood (plywood or wood planking). Please refer to the Membrane Assembly and Acceptable Deck Chart here.

How long can the protection sheet over the Monolithic Membrane 6125 (MM6125) be left exposed to UV?

The protection sheet over Monolithic Membrane 6125 (MM6125) can be left exposed to UV for up to 30 days, 6 months, or indefinitely, depending on the protection sheet used. Hydroflex 30 protection sheet should be covered with subsequent overburden within 30 days of installation. Hydrocap 90 may be left exposed up to 6 months and Hydrocap 160 may be left exposed indefinitely.

What is the application temperature of Monolithic Membrane 6125 (MM6125)?

The application temperature of Monolithic Membrane 6125 (MM6125) is between 356 and 375 degrees F (180 - 190 degrees C). MM6125 should be heated and melted in a rubberized asphalt melter (not a typical asphalt kettle) to the application temperature mentioned above.

What is the thickness of Monolithic Membrane 6125-FR (Fabric Reinforced)?

The thickness of Monolithic Membrane 6125-FR is 215 mils (approx 7/32", 5.5 mm). The total thickness is composed of an initial 90 mil thick coat of MM6125, into which is embedded a layer of spunbonded polyester, followed by a top coat of MM6125 at 125 mils thickness.

Does Hydrotech have an FM approved assembly?

Yes, Hydrotech does have an FM approved assembly. Hydrotech maintains FM Approval as a Class 1 Roof Cover for MM6125-FR. In such cases, the protection sheet must be Hydrocap 90 FR.

Can Hydrotech offer an FM Approval for a vegetated roof assembly?

Monolithic Membrane 6125 is the only membrane that can offer an FM approval for a vegetated roof assembly, starting at the deck and up through the vegetation. 

What are my surfacing options?

Surfacing options for typical Protected Membrane Roof (PMR) applications, also known as Inverted Roof Membrane Assemblies (IRMA), include stone ballast, architecturally finished concrete pavers, a concrete topping slab, or our Garden Roof® and Blue Roof components. Self-ballasted concrete surfaced Styrofoam panels called Hydroguard® are also available as an option.