The 2015 IECC requires that each home or multifamily dwelling unit shall be tested and verified for air leakage using a blower door test.
The leakage rate, reported as Air Changes/Hour (ACH) measured @ 50 Pascals pressure, shall not exceed:
Currently, Texas occupies 3 climate zones.
Climate Zone 2, shaded orange. Southern Texas. Major Cities: Houston, San Antonio, Austin and Waco.
Climate Zone 3, shaded yellow. Northeast to far west Texas Major Cities: DFW, Midland, Lubbock and El Paso.
Climate Zone 4, in green. Most of the Texas panhandle. Major City: Amarillo.
Current polyseal standards are probably not enough!
For fiberglass or cellulose insulated homes, an AGGRESSIVE regimen of sealing of all holes, cracks, and gaps MUST be put into practice! Reaching 3 ACH will require high attention to detail.
Installed correctly, most spray foam insulated homes may meet 5 ACH for zone 2 compliance, but additional sealing will most likely be required to meet the requirement for zones 3 & 4.