TAG flags broad rewrite of tiny-house appendix, sleeping‑loft definitions and whole‑house ventilation requirements

TAG members discussed extensive drafting work needed for the tiny‑house appendix (AQ in Washington’s code, NB in the 2024 IRC renumbering) and for sleeping‑loft terminology scattered through the code. TAG member Jen said she would prepare a full code‑format proposal that shows the model text, current Washington amendments, and her suggested strike/insert edits so members can review the appendix as a single document rather than piecemeal lines. "I could have all of the whole model code language, and then all of our amendments, and then my suggested changes," she said. The group focused on two enforcement/clarity items for tiny houses: the air‑leakage threshold and whole‑house mechanical ventilation. The existing amendment text in the tiny‑house appendix uses an air‑leakage metric of "0.3 CFM" (several references used “0.3 CFM per square foot” in discussion). Jonathan asked whether the "0.3 CFM per square foot" should be the tested metric or a design/permit metric; he said testing can be inconsistent and enforcement is often unclear. Jonathan offered to draft a change proposal addressing whether the ventilation requirement should be tied to design or testing. Jen suggested simplifying the appendix so that tiny houses clearly require whole‑house mechanical ventilation (pointing to section references such as 1505.4) and removing confusing cross‑references; "we wouldn't have that problem that Jonathan just brought up, which would be very painful," she said. The TAG asked Jen to draft the complete appendix as a code change proposal and to share it with Dustin (staff) for distribution ahead of the next meeting. Jonathan and Jen agreed to coordinate on clarifying whole‑house mechanical ventilation and inspection/testing responsibilities (factory-built vs. field-built tiny houses).