Subfloor Slab Steel reinforced subfloor slab. Designed to be placed over steel supports at greater separation. Get a FREE QuoteResources Subfloor Slab Steel reinforced subfloor slab. Designed to be placed over steel supports at greater separation. ADVANTAGES Fast Installation. Reduces structural costs due to light weight. Requires less framing (allows for more separation between supports). Eliminates on-site casting for sturdy subfloors. APPLICATION Subfloors. Panels can be attached directly over steel frames, concrete or confined masonry walls. WEIGHT 12.3 lbs/ft2 for 4’’ thick panels. Data Sheet Material Safety