SECTION 03505

SELF-LEVELING UNDERLAYMENT

PART 1 GENERAL

SECTION INCLUDES

Liquid applied, [cementitious] [gypsum based] self-leveling floor underlayment.

RELATED WORK

Section [______-____________]:	Concrete floor substrate.

Section [03410 - Structural Precast Concrete] [03415 -Precast Concrete Hollow Core Planks]: Precast concrete floor substrate.

Section [______-____________]:	Wood floor substrate.

REFERENCES

ASTM C472 - Method for Physical Testing of Gypsum Plasters and Gypsum Concrete.

ASTM E286 - Test Method for Surface Flammability of Building Materials Using an 8 Foot (2.44 m) Tunnel Furnace.

SUBMITTALS

Submit under provisions of Section [01300] [________].

Product Data: Provide physical characteristics, product limitations, and [________________].

Manufacturer's Installation Instructions: Indicate mix and [________________] instructions.

Manufacturer's Certificate: Certify that [products] [________] meet or exceed [specified requirements] [___________________].

QUALIFICATIONS

Applicator: Company specializing in performing the work of this Section [with minimum [__________] years [documented] experience] [approved by manufacturer].

REGULATORY REQUIREMENTS

Conform to [applicable] [___________] code for combustibility or flame spread requirements.

Conform to [UL] [FM] [Warnock-Hersey] Assembly Design No. [___________].

Provide certificate of compliance from [authority having jurisdiction [________________] indicating approval of underlayment materials in the required fire rated assembly.

FIELD SAMPLES

Provide under provisions of Section [01400] [________].

Place a field sample panel of underlayment material, [_____] feet ([____] m) long by [______] feet ([____] m) wide.

Locate [where directed] [__________________________].

Accepted sample may [not] remain as part of the Work.

ENVIRONMENTAL REQUIREMENTS

Do not install underlayment until floor penetrations and peripheral work is complete.

Maintain minimum ambient temperatures of [50] [____] degrees F ([10] [____] degrees C) [24] [____] hours before, during and [72] [____] hours after installation of underlayment.

During the curing process, ventilate spaces to remove excess moisture.

PART 2 PRODUCTS

MANUFACTURERS - [GYPSUM] [CEMENT] BASED UNDERLAYMENT

[__________________________________] Product [_________].

[__________________________________] Product [_________].

[__________________________________] Product [_________].

Substitutions: Under provisions of Section [01600] [________].

MATERIALS

Underlayment: [Gypsum] [Cementitious] based mix.

Water: Potable and not detrimental to underlayment mix materials.

Primer: Manufacturer's recommended type.

Joint and Crack Filler: Latex based.

MIXING

Site mix materials in accordance with manufacturer's instructions.

Mix to achieve following characteristics:

Density:	[100] [115] [____] lb/cu ft ([1 600] [1 840] [____] kg/cu m) minimum dry density.

Compressive Strength: [1000] [2500] [____] psi ([6 900] [17.2 [____] MPa) minimum [in accordance with ASTM C472].

Fire Hazard Classification: 0/0/0 (Flame/Fuel/Smoke) rating in accordance with ASTM E286.

Mix to consistency to achieve self-leveling.

PART 3 EXECUTION

EXAMINATION

Verify substrate conditions under provisions of Section [01039] [________].

Verify that substrate surfaces are clean, dry, unfrozen, do not contain petroleum by-products, or other compounds detrimental to underlayment material bond to substrate.

PREPARATION

Remove substrate surface irregularities.	Fill voids and deck joints with filler. Finish smooth.

Vacuum clean surfaces.

[Prime substrate in accordance with manufacturer's instructions. Allow to dry].

INSTALLATION

Install underlayment in accordance with manufacturer's instructions.

Place to thickness [indicated] [as scheduled].

****** [OR] ******

Place to minimum [1/8] [____] inch ([3] [____] mm) and maximum [1/2] [____] inch ([6] [____] mm) thickness.

Install [before] [after] partition installation.

CURING

Air cure in accordance with manufacturer's instructions.

APPLICATION TOLERANCE

Maintain top surface level to [1/8] [1/16] inch in 10 ft ([3] [1.5] mm in 3 m).

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400] [________].

Placed material will be inspected [and tested] for conformance to specification requirements.

PROTECTION OF FINISHED WORK

Protect finished Work under provisions of Section [01500] [________].

Do not permit traffic over unprotected floor surface.

SCHEDULES

Apartment Suites Above Grade: Gypsum based underlayment, 1/8 inch nominal thickness.

Apartment Suites Below Grade and Grade Level Entry:

Cement based underlayment, 1/16 inch nominal thickness.

END OF SECTION