Sentences with phrase «levels of air leakage»

The third project throwing a wrench in the ever - weakening argument is the über - compact NewenHouse in Viroqua, Wisconsin (7,795 HDDs), with Carly Coulson as the certified Passive HouseA residential building construction standard requiring very low levels of air leakage, very high levels of insulation, and windows with a very low U-factor.

Since green buildings usually have very low levels of air leakage, mechanical ventilation is usually essential.

Not exact matches

If a builder achieves an airtightness level of 5 cubic metres of air leakage per hour, or better, and chooses so called «natural» ventilation, he must increase the equivalent area of background ventilation by 40 %.

In addition, use of the sealed «cathedralized» attic in hot climates can be a successful approach to avoiding pervasive problems associated with ducts located in attics and air leakage at the ceiling level, without energy penalty.

High air change during cooling periods due to infiltration / exfiltration, duct leakage, and excessive ventilation can lead to elevated interior levels of moisture.

In mixed climates, building envelopes are constructed in an airtight manner to control air leakage openings, to expedite air pressure control (depressurization of the building envelope above grade during the heating season, pressurization below grade to control ingress of soil gas and other pollutants, and pressurization of the building envelope during the cooling season) and to facilitate the dehumidification of indoor air during the cooling season, thereby limiting interior moisture levels.

Moisture movement by air leakage (the exfiltration of interior moisture - laden air during heating periods and the infiltration of exterior moisture - laden air during cooling periods) is controlled by limiting air leakage openings, controlling the interior levels of moisture during heating periods by utilizing controlled ventilation (dilution by air change) combined with source control (direct venting of clothes dryers as well as the use of subgrade vapor retarders under concrete floor slabs and bath and kitchen exhaust systems), controlling the interior levels of moisture during cooling periods by utilizing the dehumidification capabilities of mechanical cooling systems, and limiting controlled ventilation to minimum values established by indoor air quality concerns.

«Their high R values and low air leakage both contribute to a greater level of thermal performance than traditional framed construction.»

Split - level homes are prone to air leakage problems, especially where the second floor meets the attic of the lower section or where the crawl space meets the basement.