# WAC 246-359-580: WAC 246-359-580. Heating, insulation, and air conditioning

> Washington · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_580

## Section

- **Citation:** WAC 246-359-580
- **Heading:** WAC 246-359-580. Heating, insulation, and air conditioning
- **Jurisdiction:** Washington
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Washington Administrative Code / Title 246 / Chapter 246-359 / Section 246-359-580

## Text

(1) When the temperature in habitable rooms will fall below seventy degrees Fahrenheit, the TWH must provide heating systems to maintain a temperature of seventy degrees Fahrenheit. Heating systems must be permanent, installed, and comply with DOSH and chapter 246-358 WAC.
(2) Insulation must be installed with a minimum of R-15 insulating material to insulate ceilings and exterior walls. When insulation is used, it must be covered with material which is safe and sturdy and sufficient to protect the building occupants from the insulating material. When insulation is installed in the ceiling, provide a minimum of one inch air space between insulation and roof sheathing and baffle.
(3) When the TWH dwelling unit temperature can rise above ninety degrees Fahrenheit during occupancy, the TWH dwelling unit must provide a coolant system to maintain a temperature at or below ninety degrees Fahrenheit.
(4) TWH buildings containing dwelling units must be provided with a one hundred cubic feet per minute (CFM) building ventilation fan capable of operating intermittently. Where an intermittent fan is installed in dwelling units with food-handling facilities, an additional building ventilation fan is not required.
(5) This section does not apply to cherry harvest camps.

## Nearby sections

- [WAC 246-359-001 WAC 246-359-001. Purpose and scope](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_001.md)
- [WAC 246-359-005 WAC 246-359-005. Applicability](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_005.md)
- [WAC 246-359-010 WAC 246-359-010. Definitions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_010.md)
- [WAC 246-359-020 WAC 246-359-020. Powers and duties of the department of health](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_020.md)
- [WAC 246-359-030 WAC 246-359-030. Cooperation with the department of health—Right of entry](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_030.md)
- [WAC 246-359-040 WAC 246-359-040. Appeals](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_040.md)
- [WAC 246-359-050 WAC 246-359-050. Minor variances to the TWH construction standard](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_050.md)
- [WAC 246-359-060 WAC 246-359-060. Architect or engineer of record and plan submittal responsibilities](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_060.md)
- [WAC 246-359-070 WAC 246-359-070. Application and construction documents required for plan review](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_070.md)
- [WAC 246-359-080 WAC 246-359-080. Plan review approval and expiration of plan approval](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_080.md)
- [WAC 246-359-090 WAC 246-359-090. Issuing and maintaining a construction permit](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_090.md)
- [WAC 246-359-100 WAC 246-359-100. Expiration and extension of construction permits](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_100.md)
- [WAC 246-359-110 WAC 246-359-110. Construction without a permit](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_110.md)
- [WAC 246-359-120 WAC 246-359-120. Required inspections](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_120.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_246_359_580. Check the current official text before relying on it. Not legal advice.