106.1- Closed Crawl Space Moisture Control – Permitting and H3 Licensure

Closed Crawl Space Moisture Control – Permitting1 and H3 Licensure

Code: 2018 Residential  Section: R409.5

Code: 2018 NC Mechanical Section: 101.2

Code: 2018 NC Administrative Section: 106.1

Question: How does the 2018 NC Mechanical Code and 2018 NC Residential Code correlate with the licensure requirements of the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors?

Answer: Section R409.5 of the 2018 NC Residential Code contains five prescribed methods of moisture control. The licensure requirement depends on the methodology chosen to control the humidity.

Table 1: Humidity Control Method lists the four prescriptive methods for providing humidity control in a closed crawl space.

Table 2: Licensure Requirement identifies which method requires an H-3 license. The licensure requirements are determined by the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors. The licensure question was posed to this Board and the response reprinted here for the convenience of the reader. If there are detailed questions concerning the licensure requirements, please contact the Board, at 919-875-3612. 1 See 2012 Administrative Code - 106.1 - Permit Required for Closed Crawl Space.pdf at http://www.ncdoi.com/OSFM/Engineering_and_Codes/Default.aspx?field1=Cod… ding_Codes&field2=Interpretations4/2012 Administrative for permit requirements. Page 2 of 2 Table 1: Humidity Control Method Table 2: Licensure Requirement H-3 license required2 ? R409.5.1 Dehumidifier R409.5.1 Dehumidifier No R409.5.2 Supply Air R409.5.2 Supply Air Yes R409.5.3 House Air R409.5.3 House Air3 No R409.5.4 Exhaust fan R409.5.4 Exhaust fan No R409.5.5 Conditioned space R409.5.5 Conditioned space Yes

Please note there are other trades that are involved, such as electrical, that may require licensure. This interpretation does not address the electrical, plumbing or general contracting licensure requirements. Keywords: 2 The determination of licensure requirements under GS 87-21is made by the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors. 3 As written, the code assumption is the house air source will be provided separate from the ducted hvac system. If the hvac system is used, it falls back to R409.5.2.