WAC 51-11C-61061. Section A106.1 — General

A106.1 General. Table A106.1 lists heat loss coefficients for heated on-grade slab floors, in units of Btu/h • °F per lineal foot of perimeter. Table A106.1 Default F-factors for On-Grade Slabs Insulation Type R-0 R-5 R-10 R-15 R-20 R-30 Unheated Slab Uninsulated slab 0.73 — — — — — 2 ft. Horizontal (No thermal break) — 0.70 0.70 0.69 — — 4 ft. Horizontal (No thermal break) — 0.67 0.64 0.63 — — 2 ft. Vertical — 0.58 0.54 0.52 — — 4 ft. Vertical — 0.54 0.48 0.45 — — Fully insulated slab* — — 0.36 0.31 0.26 0.21 Heated Slab Uninsulated slab 0.84 — — — — — Fully insulated slab* — 0.74 0.55 0.44 0.39 0.32 R-5 Center (With perimeter insulation) — — 0.66 0.62 — — R-10 Center (With perimeter insulation) — — — 0.51 — — 3 ft. Vertical — — 0.78 — — — Insulation Type R-0 R-5 R-10 R-15 R-20 R-30 Unheated Slab Uninsulated slab 0.73 — — — — — 2 ft. Horizontal (No thermal break) — 0.70 0.70 0.69 — — 4 ft. Horizontal (No thermal break) — 0.67 0.64 0.63 — — 2 ft. Vertical — 0.58 0.54 0.52 — — 4 ft. Vertical — 0.54 0.48 0.45 — — Fully insulated slab* — — 0.36 0.31 0.26 0.21 Heated Slab Uninsulated slab 0.84 — — — — — Fully insulated slab* — 0.74 0.55 0.44 0.39 0.32 R-5 Center (With perimeter insulation) — — 0.66 0.62 — — R-10 Center (With perimeter insulation) — — — 0.51 — — 3 ft. Vertical — — 0.78 — — — * Edge insulation R-10 regardless of the below slab insulation level. * Edge insulation R-10 regardless of the below slab insulation level.