![]() Here’s a quote from the book Ventilation and Heating by John Shaw Billings, M.D.: We’re all in agreement, right? Isn’t it fun to get into the world of ventilation standards and codes! But guess what. #Ontario building code 2018 code#(Won’t that be fun!) If the code language above does not pass, the ERI path probably won’t be as appealing to builders because they’ll take a hit in ERI points for meeting code instead of ASHRAE 62.2-2013. If the code amendment passes but RESNET’s doesn’t, RESNET will have to make changes to calculate the ERI separately from the HERS Index. If that language gets adopted and RESNET passes its amendment, the ERI will be based on the new IRC ventilation rate. The ERI reference design ventilation rate shall be as specified by Equation 15-1 of Section M1507.3.3 of the International Residential Code. The code also has to make a change because even if RESNET adopts that amendment, the code language for the ERI points to RESNET’s old standard. RESNET has to change its standard if it wants its HERS Index to qualify as an Energy Rating Index. It will be in the 2018 IRC/IECC.īut now they have to make another change because of the ERI. It’s the same rate whether you do exhaust-only, supply-only, or balanced. There’s no acknowledgment of the differences between ventilation strategies, though. That’s basically the rate from the 2010 version of ASHRAE 62.2. (0.01 cfm/square foot of conditioned floor area) + (7.5 cfm/person) Last year at the code hearings, that rate was updated to: Through the 2015 IRC, the ventilation rate was set at the ASHRAE 62-1989 rate:Ġ.35 air changes per hour but not less than 15 cfm/person ![]() Since the 2015 codes came out, they’ve taken up the issue of ventilation rates. So, the code hearings keep happening because they’ve got to keep up with their three year cycle of publishing updated codes. Actually, RESNET is tied in pretty strongly already because the HERS reference home is based on the 2004/2006 IECC. That ties RESNET to the building codes pretty strongly. That index is basically the same thing as the HERS Index and is in the 2015 IECC. It’s a performance, as opposed to prescriptive, path and meeting the code is based on hitting a certain number on what they call the Energy Rating Index (ERI). In the last code cycle (the codes get updated every three years), the IECC adopted another compliance pathway. This is connected to RESNET because of something I wrote about three years ago. ![]() This happened last year and will go into effect in the 2018 editions of the International Residential Code (IRC) and International Energy Conservation Code (IECC). ![]() I mentioned in that article that the building code has adopted a new ventilation rate. Earlier this month I wrote about a new amendment that RESNET has out for public comment now. If you’ve followed this blog for any amount of time, you know there’s plenty of disagreement to be found in the realm of ventilation for homes. Airtight houses need mechanical ventilation. Everyone agrees: We need airtight houses. One of the easier topics in building science. ![]()
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