The building must be fully enclosed, protected from sun and wind. A minimum temperature of 50°F must be maintained before, during and after the installation of GSL CSD until dry. Typical drying period for a 1-9/16” GSL CSD application is 14 to 21 days (minimum 50°F, 50% or less humidity).
The corrugated deck must be dry, clean, free of dust or any other contaminants that may interfere with bonding.
GSL CSD is highly flowable. The perimeter, mechanical and plumbing penetrations, and other gaps in the substrate must be sealed to prevent leaks. Prior to pouring GSL CSD, an approved priming system for galvanized steel must be used. Consult a Dependable technical representative on the proper priming procedures.
MIXING AND PLACEMENT
Follow Dependable, LLC guidelines and specifications. GSL is only to be installed by trained contractors approved by Dependable, LLC.
Compression Strength
3000 – 4500 psi
Substrate
Corrugated steel deck.
Wear a NIOSH/OSHA approved dusk mask and/or provide ventilation when mixing the product.
The correct mix design should yield a slump of 9” ± 1" when using a 2”x 4” section of PVC over a smooth plastic or glass sheet. Higher slumps will affect the final compressive strength. It’s recommended to use the smallest slump possible to achieve the desired compressive strength and surface.
If after placement the product is not smooth and homogenous, extended mix time with slightly more water (within the specified range) may be required. If separation or surface bleed occurs, reduce the water quantity to form a smooth, homogenous, flowable consistency. A working time of approximately 15 minutes should be anticipated, but will vary with temperature, humidity, and mixing consistency. Do not attempt to re-temper the mix once it begins to set. Use a gauge rake to screed the material to desired thickness and then use a darby to smooth the surface removing any surface imperfections.
PREPARATION FOR FLOOR COVERING
For moisture sensitive floor coverings, test the underlayment prior to installation by using the plastic sheet method per ASTM D-4263 or using a Delmhorst BD-2100 on gypsum scale. If visible signs of moisture are present, then more drying time is required. Do not test GSL CSD for dryness using the calcium chloride method, ASTM F-1869, as inaccurate results will occur. For tile and stone installations, a water proofing crack isolation membrane is recommended but not required. For portland cement based adhesives, a floor sealer is recommended. Water-based adhesives will generally not require a floor sealer unless the porosity of the underlayment does not allow sufficient working time. Solvent based, or moisture cured urethanes do not normally require (and are normally not compatible with) a surface sealer. In applications where the floor goods manufacturer differs from these recommendations, the floor goods manufacturers’ recommendations will supersede all others. Consult an Dependable technical representative for additional details.
LIMITATIONS
• Minimum Steel Deck Standards: Minimum 22 gauge galvanized steel deck with minimum flute depth of 9/16
• Deflection Limits of the Structure: Live and dead loads considered, L/240 minimum. Dead loads only, L/360. Deflection limits of the decking material: L/480. More restrictive deflection limits may be required by some types of floor goods. Contact the floor covering manufacturer for minimum specifications.
• Minimum Assembly Construction Criteria: Reference the Underwriters Laboratories Fire Resistance Directory for a full description of minimum criteria for each individual fire rated design.
• When use with hydronic heating systems, GSL CSD must be poured to a thickness of 3⁄4” above the top of the tubing or 1” above the top of the flutes in the metal deck, whichever is greater.
• Drying time before application of floor goods depends on thickness, humidity and ventilation conditions. At an average thickness of 1.25”, GSL CSD can typically be covered in 10-14 days. Thicker pours, humid conditions, and poor ventilation will require extended drying times.
• GSL CSD is NOT a wear surface.
• GSL CSD is for interior use only and should not be used in areas where extended or repetitive exposure to moisture is anticipated.
• GSL CSD is permeable to moisture vapor. In cases where moisture vapor drive is anticipated, such as over a crawl space or below grade, a moisture vapor barrier is recommended.
• GSL CSD is approved for pedestrian foot traffic and light rubber wheeled traffic.
• GSL CSD is non-structural cement and will crack where excess substrate deflection or dynamic loads exceed the deflection limit of the substrate. Additional reinforcement is recommended where high dynamic loading is anticipated.
• GSL CSD should not be used to bridge moving cracks or expansion joints. All joints must be honored through to the substrate.
• Finished floor covering manufacturer recommendations supersede all others.
