D u r a – C a p ® F l o o r Underlayment is a nonstructural gypsum concrete used with aggregates in pouring crack resistant, fire resistant and sound-insulating floors. Batch mixed on the job, barrel mixed or pumped into place by authorized applicators, ideal over veneer and non-veneer wood subfloor panels, precast concrete and cast-in-place concrete. With proper preparation, Dura-Cap® Floor Underlayment can accept virtually any type of flooring material.

Package: 50 lb bag

Mixing: Precisely 4.5 quarts per 50 pound bag.

4. Installation

Building interior should be enclosed and maintained at a temperature above 50°F (10°C) until structure and subfloor temperatures are stabilized. The subfloor must be broom clean and contaminant-free. Before pouring Dura-Cap® Floor Underlayment, the wooden subfloor must be primed with 1 coat of Maxxon Acrylic, Maxxon Floor Primer, or an approved equal as per manufacturer’s recommendations.

Methods of Installation: The minimum thickness of Dura-Cap® varies with the type of floor system. Dura-Cap® can be feather-edged over concrete substrates. Minimum wood frame construction is agency approved 19/32”, 40/20 veneer and non-veneer subfloor panels. Preferred wood frame construction is 3/4” Dura-Cap® Floor Underlayment tongue-and groove gency approved subfloor with joist, truss, or beam spacing of 16”-24” o.c. Continuous ventilation and adequate heat should be provided to rapidly remove moisture from the area until the Dura-Cap® Floor Underlayment is dry. The general contractor must supply mechanical ventilation and heat if necessary.

Testing: Compressive strength testing must be performed in accordance with modified ASTM C472. Before independent sampling, contact Maxxon Corporation’s Quality Assurance Department to ensure that proper procedures are followed. 

Code Listings:

GREENGUARD Gold Certified; GREENGUARD Certified®; ICC-ES Legacy Report ESR-2540; ICC-ES Legacy Report #90-31.

 5. Technical Data

See Tables 1-3

TABLE 1—TECHNICAL DATA

Compressive Strengths: Up to 4,000 PSI (27.6 MPa) when tested in accordance with modified ASTM C472. Static loading to 4,000 PSI (27.6 MPa)

Dry Density: 115 lbs/ft³ (1842 kg/m³)

Weight: At 1/2” (12.7 mm), less than 5.3 lbs/sq ft (25.9 kg/m²)

Thermal Resistance at 1” (25mm) thickness: R-0.202

Coefficient of Conductivity (K): 4.76 Btu/(h · ft² · ºF) (.6854 W/[m · ºC])

Specific Heat: .229 Btu/(lb · ºF) at 85ºF (.9595 kJ/[kg · ºC] at 29.44ºC)

Surface Burning Characteristics: Flame Spread – 0, Fuel Contribution – 0, Smoke Development – 0

  

TABLE 2—FIRE RATINGS/UL DESIGN #

G524  G560  G561  G563  G566  G574  G576  J804  J805  J917  J919  J920  J924  J927  J931  J957  J958  J966  J991  J994  K906  L004  L005  L006  L201  L202

L206  L208  L209  L210  L211  L212  L501  L502  L503  L504  L505  L506  L507  L508  L509  L510  L511  L512  L513  L514  L515  L516  L517  L518  L519  L520

L522  L523  L524  L525  L526  L527  L528  L529  L530  L532  L533  L534  L535  L536  L537  L538  L539  L540  L541  L542  L543  L545  L546  L547  L549  L551

L552  L555  L556  L557  L558  L560  L562  L563  L564  L573  L574  L575  L579  L581  L583  L585  L588  L589  L592  L593  L594  L599  M500  M503  M504  M505

M508

ULC Design #  L003 L201 L511 L512 M500 M501 M503 M513 M514 M517

 

See “Yield and Pricing” page under this tab.

7. Warranty

Maxxon Corporation warrants Dura-Cap® Floor Underlayment to be free from manufacturing defects as determined in this warranty. Manufacturing defects are considered to be those defects that occur due to the quality of Dura-Cap® Floor Underlayment ingredients or from the manufacturing process itself. This warranty does not include labor costs and other costs or expenses associated with the removal or installation of Dura-Cap® Floor Underlayment. B e c a u s e t h e Maxxon Corporation does not perform the actual installation, it cannot be held responsible for the results of the application. M a x x o n C o r p o r a t i o n specifically disclaims problems that occur due to weather conditions, structural movement, structural design flaws and application techniques. This warranty is in lieu of all other warranties, expressed or implied, including the warranty of merchantability and fitness of purpose and of all other obligations or liabilities on Maxxon Corporation.

 8. Limitations

 (1) The typical maximum depth of Dura-Cap® Floor Underlayment is 3” (76 mm). For depths greater than 3” (76 mm), contact an authorized applicator.

(2) Dura-Cap® Floor Underlayment may be scheduled before or after installation of drywall.

(3) All materials above crawl spaces must be protected by a vapor barrier.

(4) During construction place temporary wood planking over the underlayment wherever it will be subjected to heavy wheeled or concentrated loads.

(5) Dura-Cap® Floor Underlayment is not designed to be installed on or below grade, except over well drained structural substrates.

(6) The structural floor should be adequate to withstand design loads with deflection limitations of L/360.

(7) Dura-Cap® Floor Underlayment should not be used for exterior application, or where it will come in prolonged contact with water.

(8) Maxxon underlayments are not a vapor barrier. The general contractor, architect, specifier, or building owner shall test below grade, on grade, or elevated slabs for MVER (ASTM F1869-09) or RH (ASTM F2170). If the MVER or RH of the concrete substrate exceeds the floor covering manufacturer ’s respective requirements for the finished flooring system, the concrete should be treated with a damp proof membrane (such as Maxxon DPM) before installing a Maxxon underlayment.