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Building code requirements for interior vapor barriers (or vapor retarders) have a sad and shameful history. First introduced in the U.S. in 1948, these code requirements were never based on science—they were based on erroneous theories promoted by manufacturers who were worried about liability issues associated with moisture accumulation in wal
The good news for whole-house ventilation afficionados is that the airtightness requirements in the 2015 and 2018 IECC eliminate that “sweet spot.”. The maximum air leakage allowed in IECC climate zones 1 and 2 is 5 ACH50 and in climate zones 3 through 8 is 3 ACH50. (That’s in section R402.4.1.2 of the 2015 & 2018 IECC.)
Pressure-Treated Sill Plates and the Building Code. A "green light" moisture meter reading in the pressure-treated sill because of something this building assembly has. Code requirements for wood-concrete contact treat the symptoms of rot, not the cause Last week we talked about moisture meters, and I asked readers why the wood in the picture ...
Below-grade basement walls need damp-proofing [406.1], but if the water table is high, use waterproofing instead [406.2]. Parge CMUs before damp-proofing [406.1], and lap and seal all joints in waterproofing [406.2]. Don’t backfill until foundation walls are anchored to the floor framing [404.1.7] (except walls supporting less than 4 feet of ...
1. Type and thickness of drywall. 2. Door ventilation requirements for electric hot water heater (if any) 3. Do I need to separate the laundry space from the utility/mechanical space (the washer/dryer and hot water heater are all planned to be in the same room) 4. Can I use a barn door on this utility room. If anyone can answer or direct me to ...
blamus20 | Posted in Building Code Questions on April 23, 2024 05:04pm Minisplits installs are rarely inspected and there seem to be many variations on how people do things. im trying to find some definitive answers to some code related questions.
The measured venting areas are higher than the average areas reported in the BLP (1991) and Sheltair (1997) studies and exceed the building code requirement by as much as three times. “The measured air leakage area for the attic ceiling, calculated normalized leakage area (NLA), and observations of the smoke test are summarized in Table 3.
In contrast, there are a “myriad” of building code requirements these days, but no training requirements to become a home improvement contractor or carpenter. “As a result, for the past 20+ years, thousands of plastic shacks called homes have been thrown together, by greed-driven developers that seem to dabble in the grey zone just below ...
The language in building codes describing requirements for slab-on-grade Insulation are some of the most poorly written sections of the residential building code. Briefly, there are no requirements in the code for horizontal insulation under or over a slab on grade. The only requirements refer to insulation at the slab perimeter, which in most ...
These guidelines were added to the 2009 IRC, to the dismay of many homeowners. They require that all kitchen exhaust hood systems capable of exhausting more than 400 cu. ft. per minute (cfm) be provided makeup air at a rate approximately equal to exhaust. This air has to either be discharged into the same room as the range hood, “or into ...