Handbook for Sound Engineers

Acoustical Noise Control 81

Another approach by Mason Industries is to build a
grid supported on neoprene mounts or, if greater isola-
tion is needed, on combination spring and neoprene as
shown in Fig. 4-24. A wood floor is then built on the
substructure.

In some situations a floating concrete slab is indi-
cated in Fig. 4-25, concrete slab is supported by the
model RIM mat. The roll-out mat is ordered with the
pad spacing based on the expected load. When the mat
is unrolled (1) the plywood panels are then put in place,
(2) the plastic sheet laid over the plywood, and (3) the
concrete poured, Fig. 4-25. A perimeter board isolates
the floating floor from the walls. The plastic film
protects the plywood and helps to avoid bridges.

Raised-Slab or Jack-Up System. This system is for

heavy duty applications where high STC ratings are

needed. In Fig. 4-26 the individual isolators are housed

in metal canisters, Fig. 4-27, that are placed typically on

36 inch to 48 inch centers each dimension. The metal

canisters are arranged to tie into the steel reinforcing

grid and are cast directly in the concrete slab. After

sufficient curing time (about 28 days), it is lifted by

judicious turning of all the screws one-quarter or

Figure 4-24. Mason Industries Floating Wood Floor

systems using either springs or neoprene. Courtesy Mason

Industries.

Figure 4-25. The roll-out mat system of constructing

floating floors. Courtesy Kinetics Inc.

if

Figure 4-26. Kinetics FLM Jack Up Concrete Floor system.

Courtesy Kinetics Corp.

Figure 4-27. Kinetics FLM isolation mount. Courtesy

Kinetics Corp.

Temporary waterproofing

Junction

plates

Pouring form

Floating floor

Perimeter isolation

Kinetics®

Model RIM

isolation

material

Reinforcing wire mesh

Reinforcing bars

Concrete floating floor

Perimeter isolation

board

Polyethylene

bond breaker

Kinetics® Model FLM isolation mounts