USACE / NAVFAC / AFCESA / NASA UFGS-09 64 00 (April 2006)
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Preparing Activity: NAVFAC Replacing without change
UFGS-09643 (August 2004)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 09 64 00
PORTABLE (DEMOUNTABLE) WOOD FLOORING
04/06
NOTE: This guide specification covers the requirements for portable (demountable)
wood flooring for use in enclosed multipurpose areas.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
NOTE: On the drawings, show:
1. Elevation of top of concrete slab on which floor system is to be installed
2. Location of equipment around which flooring is to be installed
3. Locations of, and structural provisions for, anchor-plate assemblies for
sports equipment
4. Plan of floor system showing overall dimension of portable panels, sizes
and installation pattern of floor panels, and game line markings
5. Storage spaces for floor panels and flat bed, four-wheel storage trucks.
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[AMERICAN WOOD PROTECTION ASSOCIATION (AWPA)AWPA C1(2003) All Timber Products - Preservative Treatment by Pressure ProcessesAWPA C2(2003) Lumber, Timber, Bridge Ties and Mine Ties - Preservative Treatment by Pressure Processes][MAPLE FLOORING MANUFACTURERS ASSOCIATION (MFMA)MFMA AFSFSCL(2003) Athletic Floor Sealer and Finish Specifications and Conformance List #22MFMA GRHM(2000) Grading Rules for MFMA Northern Hardwood Maple]1.2 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] The following shall
be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Flooring system
Submit drawings indicating the overall layout, the panel numbers, and the complete details
of the floor system. Include all assembly and disassembly instructions.
SD-04 Samples
Wood floor unit[; G][; G, [_____]]
Accessories
Submit one wood floor unit, which shall consist of two completely finished, interlocked partial
panels. Each partial panel shall be 915 by 915 mm 36 by 36 inches.
SD-08 Manufacturer's Instructions
Wood flooring unit assembly
Wood flooring unit storage
Finishing
SD-10 Operation and Maintenance Data
Finish Maintenance, Data Package 1; [; G][; G, [_____]]
Submit in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA.
1.3 DELIVERY AND STORAGE
Deliver floor materials to the building site in original containers, properly assembled and thoroughly protected
by providing flat-strapped wire, fiberboard protectors, blocking, and bulkheading, as necessary. Before the initial
assembly and erection, store the floor materials under cover in a well-ventilated, enclosed area so that the
floor materials are not exposed to extreme changes in temperature and humidity. Do not store the floor materials
in an enclosed area under construction until the concrete, masonry, ceramic tile work, terrazzo, and plaster
are dry.
1.4 STANDARD PRODUCT
The portable (demountable) wood flooring system shall be the product of a manufacturer regularly engaged in the
production of such wood flooring systems. The Contractor shall provide all accessories required for a finished
installation.
PART 2 PRODUCTS
2.1 MATERIALS
2.1.1 Wood Framing Members
NOTE: The pressure-preservative treatment specified herein shall be modified
in accordance with the recommendations made by the special assistant for entomology
and wood preservation assigned by NAVFAC directives.
Use kiln-dried, 50 by 75 mm 2 by 3 inch (nominal size), S4S, No. 1 common and better Douglas fir or No. 2 dimension
southern pine lumber. The moisture content of the lumber shall not exceed 15 percent. Provide pressure-preservative
treatment of the lumber in accordance with AWPA C1 and AWPA C2.
2.1.2 Finish Wood Flooring
NOTE: Select the appropriate flooring as follows: First Grade--where fine appearance
is desired, e.g., churches, offices, hospitals; Second and Better Grade--stores,
schools, factories, and other similar locations; Third and Better Grade--recreation
rooms, factories, warehouses, grain storage bins, farm buildings, and other
similar locations.
The flooring shall be First Grade hard maple (acer saccharum), graded in accordance with the MFMA GRHM "Grading
Rules for Hard Maple." The flooring shall be [26.2 mm 33/32 inch] [19.8 mm 25/32 inch] thick with a 57 mm 2
1/4 inch face. The flooring shall be kiln dried, continuous tongue-and groove, and end-matched. The flooring
shall be clearly stamped: [First Grade] [Second and Better Grade] [Third and Better Grade]. The moisture content
of the flooring shall not exceed 8 percent at the time of arrival and shall be not greater than [8 to 10] [8
to 9] percent when installed.
2.1.3 Portable Flooring Subfloor
The subfloor shall be 12.7 mm 1/2 inch thick fir or pine plywood, C-D grade with exterior grade glue, Exposure
1.
2.1.4 Floor Finish Material
The floor finish material shall be selected by the flooring manufacturer from the latest MFMA AFSFSCL "Floor
Finish List." The finish material shall be suitable for the service requirements imposed on the type of portable
flooring specified herein.
2.1.5 Kiln Drying
Only flooring which has been kiln dried will be considered to be standard grade.
2.1.6 Edge Grain Flooring
Use edge grain hardwood flooring consisting of pieces with annual rings that range from 30 degrees horizontal
to 90 degrees vertical.
[2.1.7 Game Line Marking Materials
Use game line marking materials recommended by the wood floor finish manufacturer.
]2.1.8 Nails
Use coated casing nails, screw nails, staples, or nailing cleats recommended by the flooring manufacturer.
[2.1.9 Storage Trucks
NOTE: If trucks are to be used for storage of floor panels, one truck will
be required for each row of floor panels. An 18 by 34 meter A 60 by 112 foot
floor will have 15 rows of floor panels, will require 15 storage trucks and
48 square meters 480 square feet of floor space for storage with each row approximately
1065 mm 42 incheshigh.
Use manufacturer-recommended flatbed, four-wheel roller-bearing trucks of approximately 1200 by 2400 mm 4 by
8 feet on which to stack the panels.
]2.1.10 Coating for Flooring Panels
NOTE: Use Group II finish for multipurpose, high-wear areas; use Group III
for floors to be utilized solely for sports.
The coating shall conform to MFMA AFSFSCL "Heavy-Duty and Gymnasium Finishes for Maple, Beech, and Birch Floors";
Group [II] [III] finish.
2.1.11 Moisture, Insect, and Fungi Protection
Prior to shipment, apply to the unfinished portion of the floor system a heavy coating of pigmented, moisture-repellent
resin paint with additives to control moisture absorption and to prevent attack by termites and fungi.
2.2 FLOORING SYSTEM
2.2.1 Design
NOTE: The overall dimensions specified cover the optimum floor size for an
official basketball court as required by the National Collegiate Athletic Association
(NCAA).
NOTE: The section of the project specification pertaining to the subfloor should
include the requirement that the subfloor shall not vary more than 6 mm 1/4
inch within an area 3 by 3 meters 10 by 10 feet. If the intent is to install
the portable floor over an existing floor, specify the 6 mm 1/4 inch tolerance
in paragraph entitled "Inspection of the Subfloors."
Design and construct the system for use over [a concrete floor slab as specified in Section 03 30 00 CAST-IN-PLACE
CONCRETE.] [a wood subfloor as specified in Section 06 10 00 ROUGH CARPENTRY.] [an ice rink surface.] [a synthetic
floor surface.] The flooring system shall consist primarily of 1200 by 2400 mm and 1200 by 1200 mm 4 by 8 foot
and 4 by 4 foot self-aligning and interlocking panels. Each panel shall consist of hardwood strip flooring nailed
to subflooring which is nailed to rigid lumber frames.
2.2.2 Assembly and Construction
When assembled, the entire floor surface shall be smooth and level and shall have the overall appearance of being
a permanent floor by being properly aligned. No bolts, screws or other fastening or locking devices shall be
visible on the floor surface. Design and construct the flooring panels in a manner affording simple and recurrent
assembling, interlocking, disassembling, and storing without the use of special tools or equipment. Ensure that
all like panels are interchangeable and replaceable. The method of panel assembling and locking shall preclude
inadvertent disassembling under all types of playing conditions. Where they are used, the projecting tongues
interlocking the flooring sections shall be wood, metal, metal-clad, or another material approved by the Contracting
Officer.
2.3 SHOP FABRICATION AND PREASSEMBLY
2.3.1 Framing
Use jigs for each fabrication operation to provide for maximum accuracy. Space the framing members at a maximum
of 300 mm 12 inches on center. Fasten the framing members and blocking from the top. The bottom surfaces of
the framing and blocking shall be free of protrusions or sharp edges that could prevent proper seating of the
finished panel or could prevent stacking of the panels for storage or shipment. The frames shall be rigid, square,
level, and true.
2.3.2 Finished Flooring
Lay the finished flooring over [the subflooring and] the framing members, running the flooring parallel with
the long dimensions of the panels. Stagger the adjacent ends of the flooring strips so that there will be at
least two strips of flooring between the joints.
2.3.2.1 Fastening the Finished Flooring
Fasten the finished flooring to [the subflooring and] the framing members with coated nails, screw nails, staples,
or nailing cleats. Fasten each strip of flooring at each bearing. Provide for any normal expansion, contraction,
or aeration in each panel.
2.3.3 Preassembly
Prior to shipment, preassemble the entire floor at the factory with all panels interlocked, and prepare for the
sanding and finishing operations specified herein. Maintain proper temperatures and humidity conditions necessary
to retain the quality of the flooring. During the preassembling of the flooring, note any inaccuracies, misalignments,
or other defects, and make the necessary corrections before shipping the panels. Letter or number each panel
on its the ends to indicate its position in the assembling of the floor.
2.4 [SHOP] [FIELD] SANDING, FINISHING, AND MARKING
NOTE: If it is preferred to have the sanding, finishing, and marking performed
at the jobsite, the specification should be modified accordingly.
2.4.1 Sanding
Machine sand the surface of the wood floor and edging using coarse, medium, and fine grades of sandpaper, respectively,
to provide for smooth and level surfaces. Following this perform a final disc sanding of the wood floor.
2.4.2 Finishing
Within 24 hours after the final sanding, sweep the floor clean using a tacky rag with a solvent recommended by
the manufacturer of the floor finish material. Apply a liberal coat of sealer to the floor, and thoroughly dry
and burnish the floor with No. 2 steel wool using an industrial-type power machine. Repeat this procedure with
each coat, as specified in MFMA AFSFSCL specifications. [After the final burnishing but prior to the application
of the final two finish coats, lay out and mark the game lines as specified herein. After the game lines are
thoroughly dry, apply the final two finish coats.]
[2.4.3 Game Line Marking
Lay out the game lines [,] [and] the fields, [and the patterns,] as indicated, masking the edges to provide for
sharp, clean edges. The edges shall be straight, and the widths shall be uniform. Apply the markings of colors
the indicated, providing a minimum dry film thickness of one mil.
]PART 3 EXECUTION
3.1 INSPECTION OF THE SUBFLOORS
NOTE: The section of the project specification pertaining to the subfloor should
include the requirement that the subfloor shall not vary more than 6 mm 1/4
inch within an area 3 by 3 meters 10 by 10 feet. If the intent is to install
the portable floor over an existing floor, specify the 6 mm 1/4 inch tolerance
in paragraph entitled "Inspection of the Subfloors."
Do not install portable floor systems on subfloors having defects that could prevent proper installation. Before
the initial installation of the floor, correct all defects in the subfloor.
3.2 FIELD ASSEMBLY, INSTALLATION, DISASSEMBLY, AND STORAGE
Do not install the floor in an enclosed area under construction until the concrete, masonry, ceramic tile work,
terrazzo, and plaster are dry.
3.2.1 Assembly and Installation
Assemble and install the entire floor system at the designed location Unless directed otherwise, the floor system
shall remain in place for a minimum of one week to permit inspection by the Contracting Officer.
3.2.2 Disassembly
After the floor system has been inspected and accepted, disassemble the floor system in the manner prescribed
by the floor system manufacturer. Correct all deficiencies prior to the storage of the floor system.
3.2.3 Storage
Following the disassembling of the floor system, store the panels within the enclosed area at the location(s)
[indicated] [designated by the Contracting Officer] and in accordance with the floor system manufacturer's printed
instructions.
3.3 SCHEDULE
Metric measurements in this section are based on mathematical conversion of English unit measurement, and not
on metric measurement commonly agreed to by the manufacturers or other parties. The English and metric units
for the measurements shown are as follows:
Products English Units Metric Units
Framing members 2 x 3 inches 50 x 75 mm
nominal
Flooring 33/32 inch 26.2 mm
25/32 inch 19.8 mm
2 1/4 inches 57 mm
Plywood 1/2 inch 12.7 mm