HomeMy WebLinkAbout03 54 13 Gypsum Reinforced Underlayment.DOCSECTION 03 54 13 - GYPSUM CEMENT UNDERLAYMENT
GENERAL
RELATED DOCUMENTS
Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01
Specification Sections, apply to this Section.
SUMMARY
Section includes gypsum-cement-based, self-leveling underlayment for application over wood frame construction for interior floor
systems.
ACTION SUBMITTALS
Product Data: For each type of product indicated.
Shop Drawings: Include plans indicating substrates, locations, and average depths of underlayment based
on survey of substrate conditions.
INFORMATIONAL SUBMITTALS
Qualification Data: For qualified Installer.
Product Certificates: Signed by manufacturers of underlayment and floor-covering
systems certifying that products are compatible.
QUALITY ASSURANCE
Installer Qualifications: Installer who is approved by manufacturer for application of underlayment products required
for this Project.
Refer also to Specification Section 01 40 00 “Quality Requirements.”
Product Compatibility: Manufacturers of underlayment and floor-covering systems certify in writing
that products are compatible.
Fire-Resistance Ratings: Where indicated, provide gypsum-cement underlayment systems identical to those of assemblies tested for fire resistance per ASTM E 119
by a qualified testing agency. Identify products with appropriate markings of applicable testing agency.
Indicate design designations from UL's "Fire Resistance Directory" or from the
listings of another qualified testing agency.
Sound Transmission Characteristics: Where indicated, provide gypsum-cement underlayment systems identical to those of assemblies tested
for STC and IIC ratings per ASTM E 90 and ASTM E 492 by a qualified testing agency.
Pre-installation Conference: Conduct conference at Project site.
DELIVERY, STORAGE, AND HANDLING
Materials shall be delivered in their original, unopened packages, and protected from
exposure to the elements.
Store materials to comply with manufacturer's written instructions to prevent deterioration from moisture or other detrimental effects.
PROJECT CONDITIONS
Environmental
Limitations: Comply with manufacturer's written instructions for substrate temperature, ventilation, ambient temperature and humidity, and other conditions affecting underlayment performance.
Place
gypsum-cement-based underlayment only when ambient temperature and temperature of substrates are between 50 and 80 deg F.
COORDINATION
Coordinate application of underlayment with requirements
of floor-covering products and adhesives, to ensure compatibility of products.
PRODUCTS
GYPSUM-CEMENT-BASED UNDERLAYMENTS
Underlayment: Gypsum-cement-based, self-leveling product that
can be applied in minimum uniform thickness of 1/8 inch and that can be feathered at edges to match adjacent floor elevations.
Products: Subject to compliance with requirements, provide
the following:
Maxxon Corporation; Gyp-Crete 2000/3.2K.
Cement Binder: Gypsum or blended gypsum cement as defined by ASTM C 219.
Compressive Strength: Not less than 2000 psi at 28
days when tested according to ASTM C 109.
Underlayment Additive: Resilient-emulsion product of underlayment manufacturer, formulated for use with underlayment when applied to substrate
and conditions indicated.
Sand Aggregate: Sand shall be 1/8 inch or less, washed masonry or plaster sand, meeting the requirements of Maxxon Corporation Sand Specification 101.
Water:
Potable, free from impurities and at a temperature of not more than 70 deg F.
Subfloor Primer: Maxxon Floor Primer.
Sealer: Maxxon Overspray.
MIX DESIGNS
General Requirements: Gyp-Crete 2000/3.2K mix proportions and methods shall be in strict accordance with product manufacturer recommendations.
EXECUTION
EXAMINATION
Examine
substrates, with Installer present, for conditions affecting performance.
Proceed with application only after unsatisfactory conditions have been corrected.
PREPARATION
Wood Sheathing
Underlayment:
Condition and Cleaning of Subfloor: Subfloor should be structurally sound. Clean subfloor to remove mud, oil, grease and other contaminating factors before the arrival
of the Gyp-Crete 2000/3.2K underlayment crew.
Leak Prevention: Fill cracks and voids with a quick setting patching or caulking material where leakage of Gyp-Crete 200/3.2K could occur.
Priming
Subfloor: Prime the subfloor using Maxxon Floor Primer. Priming instructions may vary according to the type of substrate. Multiple coats may be necessary.
Expansion joints: Allow joints
to continue through the Gyp-Crete 2000/3.2K at the same width.
APPLICATION
General: Mix and apply underlayment components according to manufacturer's written instructions.
Close areas
to traffic during underlayment application and for time period after application recommended in writing by manufacturer.
Coordinate application of components to provide optimum underlayment-to-substr
ate and inter-coat adhesion.
Scheduling: Application of Gyp-Crete 2000/3.2K shall not begin until the building is enclosed, including roof, windows, doors and any other fenestration.
Install after drywall installation.
Apply primer over prepared substrate at manufacturer's recommended spreading rate.
Apply underlayment to produce uniform, level surface.
Apply a final
layer without aggregate to product surface.
Feather edges to match adjacent floor elevations.
Cure underlayment according to manufacturer's written instructions. Prevent contamination
during application and curing processes.
Seal all areas to receive glue down floor goods according to Maxxon Corporation’s Specifications.
See the Maxxon Corporation’s “Procedures for Attaching Finished Floor Goods to Maxxon Underlayments” for written instructions for guidelines for installation of finished floor goods.
This procedure is not a warranty and is to be used as a guideline only.
Remove and replace underlayment areas that evidence lack of bond with substrate, including areas that emit a "hollow"
sound when tapped.
FIELD QUALITY CONTROL
Slump Test: Gyp-Crete 2000/3.2K mix shall be tested for slump as it is being pumped using a 2 inch by 4 inch cylinder resulting in a patty size
of 8 inches plus or minus 1 inch diameter.
Field Samples: At least one set of 3 molded cube samples shall be taken from each day’s pour during the Gyp-Crete 2000/3.2K application. Cubes
shall be tested as recommended by the Maxxon Corporation in accordance with modified ASTM C 472. Test results shall be available to the Architect and/or Construction Manager and Contractor.
Upon request from applicator.
Flatness Tolerance: After applying float finish, grind smooth any surface defects that would telegraph through applied coatings or floor coverings.
Finish
and measure surface so gap at any point between surface and an unleveled freestanding 10 foot long straight edge, resting on two high spots and placed anywhere on the surface, does not
exceed 1/8 inch for all other Gyp-Crete work.
PROTECTION
Protect underlayment from concentrated and rolling loads for remainder of construction period.
REPAIRS
Remove, repair and replace
all areas of Gyp-Crete damaged during construction to match surrounding. Repair in accordance with manufacturer’s recommendations.
END OF SECTION 03 54 13