View our Product FAQ for answers to common questions about GenieMat® products.
GenieMat® FF Modular is available in 2' x 2' squares. The top of each panel is OSB while the bottom has pre-attached one inch thick (FF44) or two inch (FF70) rubber isolators with mineral wool insulation between the isolators. The rubber isolators on the bottom side are made from 92% recycled rubber content. GenieMat® FF Modular is used when superior sound control is required in the floors of mechanical rooms, sound studios, home theaters, exercise rooms, gyms, and dance floors. This product is also used under direct sound generators such as drum sets, pianos, speakers, sub-woofers, compressors, other heavy machinery, etc.
A major benefit of GenieMat® FF Modular over popular point isolation methods is the lack of fiberglass which can produce mold. The simplicity of a GenieMat® FF Modular assembly requires no additional engineering approval and can easily be installed by inexperienced contractors. This product will not break down or move under load and is strong enough for trades to work on before overlaying with concrete or plywood.
GenieMat® FF Modular will always perform best over or under concrete, either full pour or lightweight. Because of the extreme mass and rigidity of the concrete, the rubber is able to compress properly allowing the rubber to add significant resilience to an otherwise rigid structure.
GenieMat® FF Modular will not perform over wood sub-floors as predictably as it will over concrete. There are two great ways to mimic the performance of rubber over concrete in a wood structure. The best way is to fix the structural deflection between the joists (read Fixing Structural Deflection). The other way is by layering approximately 7 pounds per square foot of material over the sub-floor or over the GenieMat® FF Modular. Layering directly to the sub-floor will help more with low frequency airborne and footfall impact noise transfer while layering over the GenieMat® FF Modular will increase the STC rating by at least a couple points with a slight reduction in low frequency performance. Any heavy material will work for layering, e.g. plywood, OSB, MDF, drywall, 3/4" lightweight concrete, or a cementitious board like HardiBacker. Layering several pounds per square foot of material over the GenieMat® FF Modular is not required, but recommended in order to maximize the performance of the rubber underlayment in a wood structure.
Layering also provides an opportunity to add more damping to the floor with a product like our Green Glue Compound. Including Green Glue Compound will add to the isolation of both impact footfall and airborne noise. Decoupling the ceiling below with GenieClips or resilient channel increases the value of the GenieMat® FF Modular in both concrete and wood structures. The highest rated floor/ceiling assemblies will have resilience in both the floor and the ceiling.
Read our article Maximizing Rubber Underlayment Performance for more detailed information.
If the joists below can be stiffened using stepped blocking, then layering can be avoided. Read our article Fixing Structural Deflection for more detailed information.