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Gymnasium Maple floor installation, MFMA, laying, sports floors
INSTALLATION OF GYMNASIUM
FLOORS OVER A CONCRETE SLAB
Gymnasium floor products offered by NOFMA mills are
most often made of 3⁄4" oak, pecan or maple. Some NOFMA
mills make 25⁄32" maple. Beech and birch are also suitable.
It is most important to have some resiliency built
into these floors, but in most respects installation closely
follows the screeds-in-mastic method recommended
for conventional use, with a plywood or board subfloor
installed over the screeds. Also, 2 layers of 1/2” plywood
cushioned and laid on a 45! angle to each other may be
used as a subfloor.
Acclimate all floor system materials to the established
environment well in advance of installation.
Make sure the slab is dry and level with a good float
finish. Maximum surface variation is 1⁄4" in 10'. Grind
down high areas and fill low areas with concrete leveling
Sweep the slab clean and prime with asphalt primer.*
Let dry thoroughly and coat with asphalt mastic, using a
notched trowel designed to apply at a rate of 50 sq. ft.
per gallon. Embed a layer of 15 lb. asphalt felt or building
paper, starting at a wall with a half sheet. Lap seams.
Cover this with another layer of mastic and embed a second
layer of asphalt felt or building paper, starting at the
same wall with a full sheet to cover the seams of the first
Either hot or cold mastic is satisfactory. If the cold type
is used be sure to allow time (2 hours) for solvents to
evaporate before applying the building paper.
An alternate method for a surface vapor retarder is to
embed a 4 to 6 mil polyethylene film in a cold mastic (See
Page 4.) Lap film edges 6".
A suspended concrete slab with a controlled environment
below needs no surface vapor retarder.
A suspended slab over exposed earth or an uncontrolled
environment requires a proper vapor retarder over the
slab. In this case cross ventilation below the slab is essential, and, if over exposed earth, a ground covering of 6
mil polyethylene should be provided.
Screeds used and their application are identical to that
previously described, with these exceptions. Place
them on 12" centers, (9" centers with 3rd grade flooring)
unless a subfloor is to be used, then 16" centers are
allowed. Leave 2" space between the ends of the screeds
and the base plate on all walls to allow for expansion.
The strip flooring may be nailed directly to properly
spaced screeds, but a much more sound and satisfactory
floor can be achieved by installing a subfloor of 3⁄4" minimum
plywood or 3⁄4" dressed square-edged boards no
wider than 6". Follow arrangement and nailing schedules
described previously. If boards are used, leave 1⁄2"
space between them.
Start laying the finish flooring in the middle of the
room and work toward the walls. Engage the first two
courses groove-to-groove with a slip tongue glued into
one groove. Join the strips and face nail as well as blind
nail both courses. Proceed with succeeding courses in
the conventional manner, using either 7d or 8d flooring
nails, 2” flooring cleats or 2" 15 gauge staples with 1⁄2"
After an area 3' or 4' wide has been laid across the
room, leave a 1⁄16" expansion space between the last course
laid and the next course. Repeat this expansion space
evenly at 3' to 4' intervals across the room. Different
area environmental conditions may require more or less
Nailing is most important. Nail to all screeds and to
both screeds when a strip passes over a lapped screed
joint. All end joints do not need to meet over screeds but
adjacent strips should not break over the same screed
If a subfloor is used, nails must be no more than 10"
to 12" apart with a minimum of 2 nails per board near
the ends (1"-3") along the length of strips.
Allow 2" expansion space along all walls and at doorways.
This can be covered at the walls with an angle iron
bolted to the wall or a special wood molding, and at doorways
by a metal plate designed for such use.
After installation and through the sanding and finishing
process, the interior environment should be maintained
near to an occupied condition. Extended times with
no HVAC in operation should be avoided. This can promote
a static “green house” effect. These conditions can
allow an abnormal increase in moisture which may
adversely affect flooring.
OUR Standard (also the Industry standard )sports floor consists of the following
Gymnasium Hardwood Floor Floors Sports Flooring - Gym Installation Repairs -BC, CANADA 604 603 7317
®AHF-All Hardwood Floor Ltd™ ©2003-2012 KEN MOERSCH 604-603-7317