EQUATION 1 - GROUP R OCCUPANCY

TARGET UA

UAT = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS |

Where: | |||

UAT | = | The target combined thermal transmittance of the gross exterior wall, floor and roof/ceiling area. | |

UW | = | The thermal transmittance value of the opaque above grade wall found in Table R402.1.3. | |

AW | = | Opaque above grade wall area. | |

UBGW | = | The thermal transmittance value of the below grade opaque wall found in Table R402.1.3. | |

ABGW | = | Opaque below grade wall area. | |

UVG | = | The thermal transmittance value of the fenestration found in Table R402.1.3. | |

AVG | = | (a) The proposed glazing area; where proposed fenestration glazing area is less than 15 percent of the conditioned floor area, minus AOG. | |

(b) 15 percent of the conditioned floor area; where the proposed fenestration glazing area is 15 percent or more of the conditioned floor area, minus AOG. | |||

UOG | = | The thermal transmittance value of the skylight glazing found in Table R402.1.3. | |

AOG | = | Skylight glazing area (if the proposed AOG exceeds 15 percent, the target AOG shall be 15 percent of the total floor area of the conditioned space). | |

UF | = | The thermal transmittance value of the floor found in Table R402.1.3. | |

AF | = | Floor area over unconditioned space. | |

URC | = | The thermal transmittance value of the ceiling found in Table R402.1.3. | |

ARC | = | Roof/ceiling area. | |

UD | = | The thermal transmittance value of the fenestration found in Table R402.1.3. | |

AD | = | Opaque door area. | |

FS | = | Concrete slab on grade component F-factor found in Table R402.1.3. | |

PS | = | Lineal ft. of concrete slab on grade perimeter. | |

FBGS | = | Concrete below grade slab component F-factor found in Table R402.1.3. | |

PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

EQUATION 2 - GROUP R OCCUPANCY

PROPOSED UA

UA = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS |

Where: | |||

UA | = | The combined thermal transmittance of the gross exterior wall, floor and roof/ceiling assembly area. | |

UW | = | The thermal transmittance of the opaque above grade wall area. | |

AW | = | Opaque above grade wall area. | |

UBGW | = | The thermal transmittance value of the below grade opaque wall. | |

ABGW | = | Opaque below grade wall area. | |

UVG | = | The thermal transmittance value of the fenestration glazing. | |

AVG | = | Fenestration glazing area, including windows in exterior doors. | |

UOG | = | The thermal transmittance value of the skylight glazing. | |

AOG | = | Skylight glazing area. | |

UF | = | The thermal transmittance of the floor. | |

AF | = | Floor area over unconditioned space. | |

URC | = | The thermal transmittance of the ceiling. | |

ARC | = | Ceiling area. | |

UD | = | The thermal transmittance value of the opaque door area. | |

AD | = | Opaque door area. | |

FS | = | Concrete slab on grade component F-factor. | |

PS | = | Lineal ft. of concrete slab on grade perimeter. | |

FBGS | = | Concrete below grade slab component F-factor. | |

PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

NOTE: | Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as: |

UW1AW1 + UW2AW2 + UW3AW3 + ...etc. |

NOTE: | Below grade walls: The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade. This will be calculated separately from above grade walls using the wall height that best describes the system. |

[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40215, filed 12/9/19, effective 7/1/20.]

EQUATION 1 - GROUP R OCCUPANCY

TARGET UA

UAT = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS |

Where: | |||

UAT | = | The target combined thermal transmittance of the gross exterior wall, floor and roof/ceiling area. | |

UW | = | The thermal transmittance value of the opaque above grade wall found in Table R402.1.2. | |

AW | = | Opaque above grade wall area. | |

UBGW | = | The thermal transmittance value of the below grade opaque wall found in Table R402.1.2. | |

ABGW | = | Opaque below grade wall area. | |

UVG | = | The thermal transmittance value of the fenestration found in Table R402.1.2. | |

AVG | = | (a) The proposed glazing area; where proposed fenestration glazing area is less than 15 percent of the conditioned floor area, minus AOG. | |

(b) 15 percent of the conditioned floor area; where the proposed fenestration glazing area is 15 percent or more of the conditioned floor area, minus AOG. | |||

UOG | = | The thermal transmittance value of the skylight glazing found in Table R402.1.2. | |

AOG | = | Skylight glazing area (if the proposed AOG exceeds 15 percent, the target AOG shall be 15 percent of the total floor area of the conditioned space). | |

UF | = | The thermal transmittance value of the floor found in Table R402.1.2. | |

AF | = | Floor area over unconditioned space. | |

URC | = | The thermal transmittance value of the ceiling found in Table R402.1.2. | |

ARC | = | Roof/ceiling area. | |

UD | = | The thermal transmittance value of the fenestration found in Table R402.1.2. | |

AD | = | Opaque door area. | |

FS | = | Concrete slab on grade component F-factor found in Table R402.1.2. | |

PS | = | Lineal ft. of concrete slab on grade perimeter. | |

FBGS | = | Concrete below grade slab component F-factor found in Table R402.1.2. | |

PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

EQUATION 2 - GROUP R OCCUPANCY

PROPOSED UA

UA = UWAW + UBGWABGW + UVGAVG + UOGAOG + UFAF + URCARC + UDAD + FSPS + FBGSPBGS |

Where: | |||

UA | = | The combined thermal transmittance of the gross exterior wall, floor and roof/ceiling assembly area. | |

UW | = | The thermal transmittance of the opaque above grade wall area. | |

AW | = | Opaque above grade wall area. | |

UBGW | = | The thermal transmittance value of the below grade opaque wall. | |

ABGW | = | Opaque below grade wall area. | |

UVG | = | The thermal transmittance value of the fenestration glazing. | |

AVG | = | Fenestration glazing area, including windows in exterior doors. | |

UOG | = | The thermal transmittance value of the skylight glazing. | |

AOG | = | Skylight glazing area. | |

UF | = | The thermal transmittance of the floor. | |

AF | = | Floor area over unconditioned space. | |

URC | = | The thermal transmittance of the ceiling. | |

ARC | = | Ceiling area. | |

UD | = | The thermal transmittance value of the opaque door area. | |

AD | = | Opaque door area. | |

FS | = | Concrete slab on grade component F-factor. | |

PS | = | Lineal ft. of concrete slab on grade perimeter. | |

FBGS | = | Concrete below grade slab component F-factor. | |

PBGS | = | Lineal ft. of concrete below grade slab perimeter. |

NOTE: | Where more than one type of wall, window, roof/ceiling, door and skylight is used, the U and A terms for those items shall be expanded into subelements as: |

UW1AW1 + UW2AW2 + UW3AW3 + ...etc. |

NOTE: | Below grade walls: The wall is assumed to extend from the slab upward to the top of the mud sill for the distance specified in Table A104.1, with 6 inches of concrete wall extending above grade. This will be calculated separately from above grade walls using the wall height that best describes the system. |

[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, § 51-11R-40215, filed 1/3/23, effective 7/1/23. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40215, filed 12/9/19, effective 7/1/20.]