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Ballasted
A ballasted
roof system provides a natural looking surface that is appealing to many building owners and architects.
The stone or concrete paver top layer can also provide protection from potential damage to the
roof membrane.
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In Sika Sarnafil’s ballasted system, the Sarnafil T roof membrane is loose-laid on a recover board or other acceptable substitutes. Sarnafil T is a Flexible Polyolefin Alloy (FPO) membrane possessing very unique properties ideally suited for stone ballasted and paver ballasted applications. Smooth and clean stone or pavers are then placed on top of the Sarnafil T membrane. The weight of the ballast keeps both the Sarnafil T membrane and the recover board in place during wind load. |
Sarnatherm Lightguard and Heavyguard
Sarnatherm Lightguard (LG) and Heavyguard (HG) are extruded polystyrene insulation boards with a modified concrete top surface. Sarnatherm LG & HG are used in protected membrane roof systems (PMRS) or “upside down” roof systems where the roof membrane is installed underneath the insulation instead of on top.
Sarnatherm LG & HG are both 2 feet by 4 feet (0.6 meters by 1.2 meters) with either 2 or 3 inches (50.8 or 76.2 mm) of extruded polystyrene insulation. They have interlocking tongue and grove joints that offer maximum protection for the roof membrane while providing wind uplift securement.
The product comes in two thicknesses for the concrete top surface, Lightguard is 3/8 inch (9.5 mm) and Heavyguard is 1 inch (25.4 mm). Both LG & HG can be ordered with or without a white reflective coating for energy efficiency.
Features and Benefits
- Sarnatherm LG and HG consists of modified concrete bonded to durable, moisture resistant STYROFOAM® extruded polystyrene insulation
- Removal and re-installation of the ballast and insulation is easy, and it can be reused
- The membrane is maintained at a nearly constant temperature, reducing the freeze-thaw cycling and membrane temperature.
- In a Protected Membrane Roof System, the insulation, separation layer and ballast are loose-laid, and these components can be reused after maintenance or re-roof construction.
- White reflective coating reduces roof top temperatures
- Reduces energy costs — retains at least 80% of its R-value over 15 years
- Reduces yearly membrane maintenance costs
- Can be laid over existing membrane to add insulation
- Typically results in the dew point being above the membrane
© 2006 Sika Sarnafil Inc. | 100
Dan Road | Canton, MA 02021 | 800-451-2504 |
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