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Gymnasium Maple floor installation, MFMA, laying, sports floors



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

field expansion.

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.









55ISO conicle


TEMBEC sissors

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

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