SECTION 03540
FLOOR UNDERLAYMENT
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PART 1 GENERAL
1.1
1.2
1.3
SECTION INCLUDES
A.
Gypsum Floor Underlayment. (AccuCrete) (AccuCrete Green)
B.
Gypsum Pourable Thermal Underlayment. (AccuRadiant) (AccuRadiant Green)
C.
Hydraulic Self-Leveling Underlayment. (AccuLevel G40) (AccuLevel G40 Green)
D.
Sound Attenuating Underlayment. (AccuQuiet C40) (AccuQuiet D18) (AccuQuiet P80)
(AccuQuiet RSM48)
E.
Integrated Floor System - Sound, Fire and Cementitious Wear Surface Topping. (FusionTec)
F.
Gypsum Underlayment for Corrugated Steel Deck Construction. (AccuLevel SD30)
RELATED SECTIONS
A.
Section 03300 - Cast In-Place Concrete.
B.
Section 05300 - Metal Deck.
C.
Section 05810 - Expansion Joint Cover Assemblies.
D.
Section 06100 - Rough Carpentry.
E.
Section 09300 - Tile.
F.
Section 09600 - Flooring.
REFERENCES
A.
ASTM International (ASTM):
1.
ASTM C 472 - Standard Test Methods for Physical Testing of Gypsum, Gypsum
Plasters and Gypsum Concrete.
2.
ASTM E 84 - Standard Test Method for Fire Tests of Building construction and
Materials.
3.
ASTM E 119 - Standard test method for Fire Tests of Building construction and
Materials.
4.
ASTM F 1869 - Standard Test Method for Measuring Moisture Vapor Emission Rate
of Concrete Subfloor Using Anhydrous Calcium Chloride.
5.
ASTM F 2419 - Standard Practice for Installation of Thick Poured Gypsum Concrete
Underlayments and Preparation of the Surface to Receive Resilient Flooring.
6.
ASTM F 2678 - Standard Practice for Preparing Panel Underlayments, Thick Poured
Gypsum Concrete Underlayments, Thick Poured Lightweight Cellular Concrete
Underlayments, and Concrete Subfloors with Underlayment Patching Compounds to
03540-1
Receive Resilient Flooring.
1.4
1.5
1.6
1.7
SUBMITTALS
A.
Submit under provisions of Section 01300.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Storage and handling requirements and recommendations.
2.
Surface preparation instructions and recommendations.
3.
Details of terminations and interfaces with other materials.
4.
Installation requirements and methods.
QUALITY ASSURANCE
A.
Manufacturer Qualifications: Minimum 5 years experience manufacturing similar products.
B.
Installer Qualifications: Installation shall be performed by a licensed AccuCrete Applicator.
C.
Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and
application workmanship.
1.
The mock-up shall demonstrate the full range of appearance and workmanship to be
expected in completed work.
2.
Locate mock-up on site in location as directed by Architect. Clean the sample panel
installation using the same materials and tools as planned for the final construction.
3.
Obtain Architect's acceptance of mock-up before start of work.
4.
Do not proceed with remaining work until work, workmanship are approved by
Architect.
5.
Modify mock-up area as required to produce acceptable work.
6.
Mock-up may be incorporated into finished work.
7.
Remove mock-up at the completion of the work.
DELIVERY, STORAGE, AND HANDLING
A.
Materials shall be delivered to the location in unopened factory containers. Upon arrival,
materials shall be inspected for damage and manufacturer informed of any discrepancies.
Deficient materials shall not be used and shall be removed from the project.
B.
Materials shall be stored in an enclosed, protected location and safeguarded from damage.
PROJECT CONDITIONS
A.
The building shall be enclosed and maintained at a temperature above 50 degrees F (10
degrees C) with adequate ventilation before, during and after the installation of the flooring
underlayment. Mechanical ventilation should be used in areas with poor ventilation to
expedite final curing.
PART 2 PRODUCTS
2.1
MANUFACTURERS
A.
Acceptable Manufacturer: Allied Custom Gypsum, which is located at: 1550 Double Dr.;
Norman, OK 73069; Toll Free Tel: 800-624-5963; Tel: 405-366-9500; Fax: 405-366-9515;
Email:sfowler@accucrete.com; Web:www.accucrete.com
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of Section
01600.
03540-2
2.2
GYPSUM FLOOR UNDERLAYMENT
A.
2.3
Gypsum Floor Underlayment:
1.
Product: AccuCrete floor underlayment as manufactured by Allied Custom Gypsum.
2.
Product: AccuCrete Green floor underlayment, with up to 80 percent recycled content,
as manufactured by Allied Custom Gypsum.
3.
Acceptable Substrates.
a.
Wood: Pourable over wood substrate, 3/4 inch to 3 inches (19 mm to 76 mm
thick).
b.
Concrete: Can be poured from 3/8 inch (9.5 mm) to 3 inches (76 mm) thick over
concrete substrates.
c.
Feather edges shall be provided where scheduled or required with patching
compound.
4.
Mix: In accordance with manufacturer specified custom formulation, absolute
maximum of 2.1 cubic feet (0.06 cubic meters) of sand per 80 lb (36 kg) bag.
5.
Typical Densities: 110 to 125 pounds per cubic foot (1762 to 2002 kg/cu. m).
6.
Design Strengths: Compressive Strength of gypsum cement tested as per modified
ASTM C 472, range from 1,400 to 3,500 PSI (9653 to 24132 kPa).
a.
Minimum Compressive Strength: ______PSI (___ kPa).
b.
Minimum Compressive Strength: As indicated on the Drawings
c.
Minimum Compressive Strength: As selected by Architect.
7.
Materials:
a.
Gypsum Cement: As manufactured by AccuCrete.
b.
Primer: Approved AccuCrete Primer.
c.
Sand: Clean, washed sand as per specifications in AccuCrete Application
Manual.
d.
Water: Potable water, free of contaminants.
e.
Sealer: Approved AccuCrete surface sealer over fully cured gypsum
underlayment.
GYPSUM POURABLE THERMAL UNDERLAYMENT
A.
Gypsum Pourable Thermal Underlayment:
1.
Product: AccuRadiant pourable thermal underlayment as manufactured by Allied
Custom Gypsum.
2.
Product: AccuRadiant Green pourable thermal underlayment, with up to 55 percent
recycled content, as manufactured by Allied Custom Gypsum.
3.
Description: A pourable thermal underlayment that delivers even heat distribution and
a smooth finish compatible with ceramic, marble and tile custom floors.
4.
Mix:
a.
In accordance with manufacturer specified custom formulation, between 3.0 to
6.0 gallons (11.4 l to 22.8 L) of water to one 80 lb (36 kg) bag of AccuRadiant
Brand Underlayment.
b.
In accordance with manufacturer specified custom formulation, requirements
for compressive strength, add maximum of 1.8 cubic feet (0.05 cu. m) of sand,
for each 80 lb (36 kg) bag of AccuRadiant Floor Underlayment.
5.
Density: Typical 115 to 120 pounds/cubic foot (1842 to 1922 kg/cu. m).
6.
Design Strengths: Compressive strength tested as per modified ASTM C 472, range
from 2200 to 3500 PSI (15168 to 24132 kPa).
a.
Minimum Compressive Strength: ______PSI (___ kPa).
b.
Minimum Compressive Strength: As indicated on the Drawings.
c.
Minimum Compressive Strength: As selected by Architect.
7.
Materials:
a.
Gypsum Concrete: As manufactured by AccuCrete.
b.
Primer: Approved AccuCrete primer to promote a bond to the substrate at the
manufacturers recommended dilution and application rate.
03540-3
c.
d.
e.
f.
2.4
2.5
Use of an approved AccuCrete Acrylic Primer/Sealer over concrete substrates
required.
Sand: Clean, washed sand as per specifications in AccuCrete Application
Manual.
Water: Potable water, free of contaminants.
Sealer: Use approved AccuCrete surface sealer over fully cured gypsum
underlayment.
HYDRAULIC SELF LEVELING UNDERLAYMENT
A.
Hydraulic Self Leveling Underlayment:
1.
Product: AccuLevel G40 self-leveling underlayment as manufactured by Allied
Custom Gypsum.
2.
Product: AccuLevel G40 Green self-leveling underlayment, with up to 45 percent
recycled content, as manufactured by Allied Custom Gypsum.
3.
Description: Premium polymer-modified self-leveling underlayment.
4.
Mix: Aggregate, sand blended on site.
a.
In accordance with manufacturer specified custom formulation, add 3.0 to 4.0
gallons (11.4 to 15 L) of water and 0.80 to 1.40 cubic feet (.08 to .11 cu. m)
sand per 80 lb (36 kg) bag of AccuLevel G40.
b.
Mix to a smooth, lump-free consistency. Use the least quantity of water within
the manufacturer specified range for custom formulation to achieve desired
slump.
5.
Materials:
a.
Hydraulic Cement: AccuLevel G40.
b.
Primer: Manufacturer approved primer over concrete substrates.
c.
Water: Potable water, free of contaminants.
d.
Sand: Washed mason or concrete sands that meet the minimum
AccuCrete/AccuLevel gradation criteria.
e.
Sealer: Approved AccuCrete Sealer over fully cured AccuLevel G40.
B.
Hydraulic Self Leveling Underlayment:
1.
Product: AccuLevel G50 self-leveling underlayment as manufactured by Allied
Custom Gypsum.
2.
Description: Lightweight, free flowing, pumpable underlayment for use in renovation
as a low-density self-leveling underlayment. Typical applications from 1/8 inch to 1
inch (3 mm to 25 mm) with "feather" edge capability.
3.
Mix: Aggregate/sand free, blended slurry of cement containing polymer modified
Portland cement and high strength gypsum cement.
a.
Dry Density: 90 to 100 lb/cf (1330 to 1500 kg/cu. m).
b.
Compressive Strength (at 28 days): 4,000 psi (27560 kPa).
c.
Add powder product to water at a mixing ratio of 3.4 to 3.75 gallons (12.9 to
14.2 L) of water per 80 lb (36 kg) bag.
d.
Mix to a smooth, lump-free consistency. Use the least quantity of water within
the manufacturer specified range for custom formulation to achieve desired
slump.
4.
Materials:
a.
Hydraulic Cement: AccuLevel G50.
b.
Primer: Manufacturer approved primer over concrete substrates.
c.
Water: Potable water, free of contaminants.
d.
Sealer: Approved AccuCrete Sealer over fully cured AccuLevel G50.
SOUND ATTENUATING UNDERLAYMENT
A.
Sound Attenuating Underlayment: AccuQuiet Sound Mat Underlayment as manufactured by
Allied Custom Gypsum.
1.
Description:
03540-4
a.
2.
3.
4.
5.
6.
2.6
Sound control mat underlayment system with perimeter tape designed for use
with AccuCrete Pourable Underlayments.
b.
Polypropylene mono-filament mesh, bonded to lightweight, water-tight technical
membrane to prevent leaks of slurry and water through the sound mat.
c.
Connections: Self sealing overlap flap.
Model: P80 AccuQuiet Sound Mat Underlayment.
a.
Polypropylene Mesh: Molded to form U-shaped configuration.
b.
Mesh Thickness: 9.5 mm (nominal 3/8 inch).
c.
Minimum AccuCrete Thickness: 1 inch (25 mm).
Model: C40 AccuQuiet Sound Mat Underlayment.
a.
Polypropylene Mesh: Molded to form cuspated configuration.
b.
Mesh Thickness: 9.5 mm (nominal 3/8 inch).
c.
Minimum AccuCrete Thickness: 1-1/2 inches (39 mm).
Model: D18 AccuQuiet Sound Mat Underlayment.
a.
Polypropylene Mesh: Molded to form cuspated configuration.
b.
Mesh Thickness: 4.8 mm (nominal 3/16 inch).
c.
Minimum AccuCrete Thickness: 3/4 inch (19 mm).
Model: RSM48 AccuQuiet Sound Mat Underlayment
a.
82 percent consumer recycled content.
b.
Mat Thickness: 3/16 inch (4.8 mm).
c.
Minimum AccuCrete Thickness: 1 inch (25 mm).
Materials:
a.
Sound Deadening Mat: Constructed of a polypropylene monofilament mesh,
bonded to a water-tight fabric backing, with low deflection properties, and
approved by gypsum cement manufacturer.
b.
Perimeter Isolations Tape: 1/8 inch (3 mm) closed cell foam strips to isolate
areas with acoustical treatment from adjacent walls and non-treated areas.
c.
Gypsum Cement: AccuCrete Brand Floor Underlayment, minimum 2,000 psi
compressive strength.
d.
Primer: Approved AccuCrete primer in either powder of liquid form over wood
subfloors.
e.
Sand: Clean, washed sand as per specifications in AccuCrete Application
Manual.
f.
Water: Potable water, free of contaminants.
g.
Sealer: Use an approved AccuCrete Surface Sealer in areas that receive glueddown floor coverings.
GYPSUM INTEGRATED FLOOR/CEILING SYSTEM
A.
Gypsum Integrated Floor/Ceiling System: FusionTEC Integrated Floor/Ceiling Assembly as
manufactured by Allied Custom Gypsum.
1.
Construction shall comply with UL assembly indicated on the drawings.
2.
Integrated Floor Systems is designed for residential and commercial use, and is
approved for light rubber wheeled and pedestrian traffic. It shall not be used in heavy
commercial or industrial settings (heavy-rolling loads or high point-loads).
3.
When installed over wood substrates, 1.5 inches (38 mm) minimum thickness
AccuLevel G40 or 1 inch (25 mm) minimum with reinforcing wire lath is required, and
a minimum AccuLevel G40 compressive strength of 3,500 PSI.
4.
When used in conjunction with AccuQuiet, this system requires a minimum of 1.5
inches (38 mm) of AccuLevel G40 at a minimum compressive strength of 3,500 PSI.
5.
In bonded systems, expansion joints shall be honored by saw-cutting the gypsum
cement and Ultrapla M20 Plus to the depth of the original substrate, and to the width
of the original expansion joint.
6.
When used at or below grade, a moisture vapor barrier shall be provided.
7.
Materials:
a.
Sound Mat: AccuQuiet Sound Mat.
03540-5
b.
c.
d.
e.
f.
g.
2.7
Hydraulic Cement: AccuLevel G40.
Epoxy Primer: FusionTEC Floor Priming System.
Cementitious Topping: Ultraplan M20 Plus.
Primer: Use an approved AccuCrete Primer.
Sand: Clean, washed mason sand as per specifications in AccuCrete
Application Manual.
Water: Potable water, free from contaminants.
GYPSUM FLOOR UNDERLAYMENT FOR CORRUGATED METAL DECK
A.
Gypsum Floor Underlayment for Corrugated Metal Deck: AccuLevel SD30 Gypsum
Underlayment for Corrugated Steel Deck Construction as manufactured by Allied Custom
Gypsum.
1.
Acceptable Substrates: Corrugated Steel Deck.
a.
Minimum Steel Deck Standards: Minimum 22 gauge (0.759 mm) galvanized
steel deck with minimum flute depth of 9/16 inch (14 mm).
b.
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.
2.
Fire Rated Assembly: UL G577.
3.
Fire Rated Assembly: UL G578.
4.
Fire Rated Assembly: UL G579.
5.
Fire Rated Assembly: UL G580.
6.
Fire Rated Assembly: UL G581.
7.
Fire Rated Assembly: UL G582.
8.
Mix: Aggregate, sand blended on site.
a.
In accordance with manufacturer formulation, add 3.0 to 4.0 gallons (11.4 to 15
L) of water and 0.80 to 1.40 cubic feet (.08 to .11 cu. m) sand per 80 lb (36 kg)
bag of AccuLevel SD30.
b.
Mix to a smooth, lump-free consistency. Use the least quantity of water within
the manufacturer specified range for custom formulation to achieve desired
slump.
9.
Density: 120 to 130 pounds per cubic foot (54 to 59 kg/cu. m).
10.
Design Strengths: Compressive Strength of gypsum cement tested as per modified
ASTM C 472, range from 3000 to 4,500 PSI (20,684 to 31,026 kPa).
a.
Minimum Compressive Strength: ______PSI (___ kPa).
b.
Minimum Compressive Strength: As indicated on the Drawings
c.
Minimum Compressive Strength: As selected by Architect.
11.
Materials:
a.
Hydraulic Cement: AccuLevel SD30.
b.
Primer: Use manufacturer approved primer for galvanized steel.
c.
Sand: Washed mason or concrete sands that meet the minimum AccuLevel
gradation criteria.
d.
Water: Potable water, free of contaminants.
e.
Sealer: Approved AccuCrete surface sealer over fully cured underlayment.
PART 3 EXECUTION
3.1
EXAMINATION
A.
Do not begin installation until substrates are within manufacturer's specified tolerances and
have been prepared in accordance with manufacturer's instructions.
B.
If substrate preparation is the responsibility of another installer, do not proceed with
installation. Notify Architect of unsatisfactory preparation immediately. Commencement of
full installation represents acceptance of existing substrate conditions.
03540-6
3.2
3.3
PREPARATION
A.
Subfloor shall be structurally sound. Subfloor shall be clean and free of all mud, oil, grease
and any other contaminants prior to pouring underlayment.
B.
Fill any cracks or voids in substrate to prevent material leakage.
ACOUSTICAL MAT INSTALLATION - ACCUQUIET
A.
3.4
3.5
Prior to gypsum concrete underlayment install acoustical mat in accordance with
manufacturer's current printed procedures.
1.
Isolate areas with acoustical treatment from adjacent walls and non-treated areas with
foam tape.
GYPSUM UNDERLAYMENT INSTALLATION - ACCUCRETE
A.
Install in accordance with manufacturer's current printed procedures.
B.
Application of Gypsum Underlayment:
1.
Prior to the application of the AccuCrete Floor Underlayment System, the building
envelope shall be enclosed (all windows, doors, roofing and other openings).
AccuCrete Floor Underlayment Systems can be poured prior to or after the installation
of drywall. Consult with AccuCrete Applicator on the appropriate mix design for
application prior to the installation of drywall.
2.
Prime all subfloors prior to the installation of the AccuCrete Floor Underlayment
System. For concrete substrates use approved AccuCrete Acrylic Primer / Sealer, and
for wood substrates use approved AccuCrete primer in powder or liquid form.
3.
Pour the AccuCrete Floor Underlayment to a minimum thickness of 3/8 inch (9.5 mm)
over a concrete or precast substrate and 3/4 inch (19 mm) minimum over a wood
substrate, while spreading and finishing to a smooth surface. Excluding authorized
joints, spread product in a continuous, monolithic application taking caution to not
pour any wet slurry against any material that has already achieved an initial set.
4.
General contractor shall provide continuous ventilation and heat as in order to rapidly
remove excess moisture from the area of the installation until such time as the
underlayment is dry.
C.
Preparation for Installation of Floor Coverings:
1.
Prior to installation of floor coverings, check for dryness using a moisture meter
calibrated with a gypsum scale or by applying a 2' x 2' plastic sheet per ASTM D
4263. Consult Manufacturer for guidelines for typical drying times and/or
methodologies for testing dryness.
2.
After the underlayment has fully dried, spray or roll on an approved AccuCrete surface
sealer prior to the installation of floor covering.
3.
If the surface of the AccuCrete Floor Underlayment has been damaged, the area is to
be repaired is sealed with an approved AccuCrete surface sealer. After the repair
material has dried, spray or roll on an approved AccuCrete surface sealer prior to the
installation of floor covering.
4.
In applications where the floor goods manufacturer requires a special adhesive, sealer
or installation system, the floor goods manufacturers' recommendations will
supersede all others.
RADIANT GYPSUM UNDERLAYMENT INSTALLATION - ACCURADIANT
A.
Install in accordance with manufacturer's current printed procedures.
B.
Application of Gypsum Underlayment:
1.
Prior to the application of the AccuRadiant Floor Underlayment System, the building
03540-7
2.
3.
4.
C.
3.6
envelope shall be enclosed (all windows, doors, roofing and other openings). Pour
AccuRadiant Floor Underlayment after the installation of drywall. Radiant tubing or
electric heating cable shall be securely fastened to the substrate.
Prime all subfloors prior to the installation of the AccuRadiant Floor Underlayment
System. Use an approved AccuCrete primer following the recommended dilution
factors.
Pour the AccuRadiant Floor Underlayment to a minimum thickness of 3/4 inch (19
mm) over the top of the hot water tubes while spreading and finishing to a smooth
surface. Excluding authorized joints, spread product in a continuous, monolithic
application taking caution to not pour any wet slurry against any material that has
already achieved an initial set.
General contractor shall provide continuous ventilation and heat in order to rapidly
remove excess moisture from the area of the installation until such time as the
underlayment is dry.
Preparation for Installation of Floor Coverings:
1.
Prior to installation of floor coverings, check for dryness using a moisture meter
calibrated with a gypsum scale or by applying a 2' x 2[' plastic sheet per ASTM D
4263. Consult Manufacturer for guidelines for typical drying times and/or
methodologies for testing dryness.
2.
After the underlayment has fully dried, spray or roll on an approved AccuCrete surface
sealer prior to the installation of floor covering.
3.
If the surface of the AccuCrete Floor Underlayment has been damaged, the area is to
be repaired is sealed with an approved AccuCrete surface sealer. After the repair
material has dried, spray or roll on an approved AccuCrete surface sealer prior to the
installation of floor covering.
4.
In applications where the floor goods manufacturer requires a special adhesive, sealer
or installation system, the floor goods manufacturers' recommendations will
supersede all others.
HYDRAULIC UNDERLAYMENT INSTALLATION
A.
Install in accordance with manufacturer's current printed procedures.
B.
Application of Underlayment:
1.
Prior to the application of underlayment, the building envelope shall be enclosed (all
windows, doors, roofing, and other openings). Underlayment can be poured prior to or
after the installation of drywall. Consult licensed AccuLevel Applicator on the
appropriate protective measure once the underlayment is placed.
2.
Prime all subfloors prior to the installation of underlayment.
3.
Pour underlayment to a minimum thickness of 3/8 inch (9.5 mm) over a concrete or
precast substrate, while spreading and finishing to a smooth surface. AccuLevel G40
should not be poured to a featheredge. Except at authorized joints, spread product in
a continuous, monolithic application.
4.
Pour underlayment to a minimum thickness of 1/8 inch (3 mm) over a concrete or
precast substrate, while spreading and finishing to a smooth surface. AccuLevel G50
can be poured to a featheredge. Except at authorized joints, spread product in a
continuous, monolithic application.
5.
General contractor shall provide continuous ventilation heat in order to rapidly remove
excess moisture from the area of the installation, until such time as the underlayment
is dry.
C.
General Guidelines for Preparation for Installation of Floor Goods:
1.
After the underlayment has cured, remove any loose or foreign material from the
surface.
2.
For tile and stone installation, a water proofing and crack isolation membrane is
recommended but not required.
03540-8
3.
3.7
3.8
For Portland 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.
INTEGRATED FLOOR/CEILING SYSTEM INSTALLATION
A.
Fire Rated Assembly: Where scheduled or required provide floor underlayment construction
identical to UL rated assembly tested for fire resistance rating required. Supporting floor
structure and rated ceiling system construction to receive the floor underlayment system
shall comply with the UL assembly construction.
B.
Integrated Floor/Ceiling Underlayment System.
1.
Install in accordance with manufacturer's current printed procedures.
2.
Building shall be enclosed and maintained at a minimum temperature of 50 degrees F
(10 degrees C) before during and after the installation.
3.
Structurally sound wood subfloors with minimum deflection criteria of L/360, free of
dirt, grease or other contaminants. New plywood or oriented strand board panels.
4.
Where moisture conditions may exist, substrates shall be checked for moister vapor
emissions, not exceeding 5 lb/1000sf/24hours when tested by the calcium chloride
method (ASTM F 1869).
5.
Unbonded systems require 1.5 inches (38 mm) minimum thickness of AccuLevel G40.
6.
Unbonded system less than 1.5 inches (38 mm) require reinforcing lath.
7.
Old wood substrates shall be protected by a waterproof membrane, and are subject to
the thickness and reinforcement requirements.
8.
When used with Sound Control Mats, minimum AccuLevel G40 thickness of 1.5
inches (38 mm) is required.
9.
When applied over wood substrates, a minimum AccuLevel G40 thickness of 1 inch
(25 mm) is required and in conjunction with reinforcing wire lath.
C.
Sequencing and Scheduling:
1.
AccuLevel G40 shall be allowed to thoroughly dry before applying primer and topping.
Typical drying times are 10 days for 1 inch (25 mm) and 14-20 days for 1.5 inches (39
mm) thicknesses, depending on ventilation, humidity and temperature. Consult a
manufacturer's representative for recommendations on determining if the product is
dry.
2.
Gypsum concrete/AccuLevel G40 may be installed before or after drywall, and early
enough to allow drying.
D.
Protection:
1.
Installed area shall be protected from direct sunlight and wind during installation of
primer and topping.
2.
Protect installed topping from trade traffic until completion of project.
GYPSUM FLOOR UNDERLAYMENT FOR CORRUGATED METAL DECK - ACCULEVEL SD30
A.
Install in accordance with manufacturer's current printed procedures.
B.
Application of Cement:
1.
Prior to the application of AccuLevel SD30, the building envelope shall be enclosed
(all windows, doors, roofing, and other openings). AccuLevel SD30 can be poured
prior to or after the installation of drywall. Please consult your licensed AccuLevel
Applicator on the appropriate protective measure once the underlayment is placed.
2.
Prime all subfloors prior to the installation of AccuLevel SD30.
03540-9
3.
4.
5.
C.
Pour AccuLevel SD30 to a minimum thickness of 1 inch (25 mm) above the top of the
corrugations in the substrate. Except at authorized joints, spread product in a
continuous, monolithic application.
When used with hydronic heating systems, AccuLevel SD30 shall be poured to a
thickness of 3/4 inch (19 mm) above the top of the tubing or 1 inch (25 mm) above the
top of the flutes in the metal deck, whichever is greater.
General contractor shall provide continuous ventilation and adequate heat as
indicated in order to rapidly remove excess moisture from the area of the installation,
until such time as the underlayment is dry.
General Guidelines for Preparation for Installation of Floor Goods
1.
After the underlayment has dried, remove any loose or foreign material from the
surface.
2.
Refer to Acculevel SD30 product data sheet for details regarding curing times and
recommended sealer installation methods.
3.
For tile and stone installation, a water proofing and crack isolation membrane is
recommended but not required.
4.
For Portland 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.
END OF SECTION
03540-10