The
most absorbent and least resilient of the three subfloors, comes
1-1/2" (38.10 mm) off the slab. Reduces sound levels slightly
and works exceedingly well for ballroom and other dance styles.
Consists of layers of 1/2" (12.70 mm) ply resting on 1/2"
(12.70 mm) cross-link cell foam sheeting covering the entire slab.
Specifications: Same wood, screw, glue specs as SSII except for
1/2" (12.70 mm) foam sheeting.