Tiny Houses 2021
TABLE N1102.4.1.1 (R402.4.1.1)—continued
AIR BARRIER AND INSULATION INSTALLATIONa
AIR BARRIER AND INSULATION INSTALLATIONa
| COMPONENT | AIR BARRIER CRITERIA | INSULATION INSTALLATION CRITERIA |
|---|---|---|
| Recessed lighting | Recessed light fixtures installed in the building thermal envelope shall be air sealed in accordance with Section N1102.4.5. | Recessed light fixtures installed in the building thermal envelope shall be airtight and IC rated, and shall be buried or surrounded with insulation. |
| Plumbing, wiring or other obstructions | All holes created by wiring, plumbing or other obstructions in the air barrier assembly shall be air sealed. | Insulation shall be installed to fill the available space and surround wiring, plumbing, or other obstructions, unless the required R-value can be met by installing insulation and air barrier systems completely to the exterior side of the obstructions. |
| Shower/tub on exterior wall | The air barrier installed at exterior walls adjacent to showers and tubs shall separate the wall from the shower or tub. | Exterior walls adjacent to showers and tubs shall be insulated. |
| Electrical/phone box on exterior walls | The air barrier shall be installed behind electrical and communication boxes. Alternatively, air-sealed boxes shall be installed. | — |
| HVAC register boots | HVAC supply and return register boots that penetrate building thermal envelope shall be sealed to the subfloor, wall covering or ceiling penetrated by the boot. | — |
| Concealed sprinklers | Where required to be sealed, concealed fire sprinklers shall only be sealed in a manner that is recommended by the manufacturer. Caulking or other adhesive sealants shall not be used to fill voids between fire sprinkler cover plates and walls or ceilings. | — |
For SI: 1 inch = 25.4 mm.
a. Inspection of log walls shall be in accordance with the provisions of ICC 400.
b. Air barrier and insulation full enclosure is not required in unconditioned/ventilated attic spaces and at rim joists.