Wash. Admin. Code § 51-11C-61061
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 | -- | -- | -- |
*Edge insulation R-10 regardless of the below slab insulation level. |
Wash. Admin. Code § 51-11C-61061
Statutory Authority: RCW 19.27A.020, 19.27A.025 and chapters 19.27 and 34.05 RCW. 13-04-056, § 51-11C-61061, filed 2/1/13, effective 7/1/13.