EAc7: Air Insulation

(1-2 points)

Intent

To minimize waste of energy caused by uncontrolled air leakage into and from conditioned spaces.

Requirements

Case 1. Single Family

Meet the air leakage requirements shown in Table 1 or Table 2.

Case 2. Multifamily

Meet the air leakage requirements shown in Table 1 or Table 2.

Meet the requirements for leakage to outside the conditioned envelope for each dwelling unit, unless the whole building can be entirely and sufficiently depressurized by a blower door(s).

Table 1. Points for reducing air leakage, in ACH50

IECC climate zone				Points
1–2	3–4	5–7	8
4.25	3.5	2.75	2.0	1
3.0	2.5	2.0	1.5	2

 

 

Table 2a. Points for reducing air leakage, in cfm50 per sf envelope area

Performance requirements IECC climate zone				Points
1–2	3–4	5–7	8
.195	.16	.125	.0925	1
.1375	.115	.0925	.0675	2

 

  

Table 2b. Points for reducing air leakage, in cmm50 per 100 square meter envelope area

Performance requirements IECC climate zone
1–2	3–4	5–7	8		Points
5.94	4.87	3.81	2.82		1
4.19	3.50	2.82	2.06		2

 

 ACH = Air changes per hour

cfm = cubic feet per minute
ELR = envelope leakage ratio
IECC = International Energy Conservation Code
sf = square feet
cmm = cubic meters per minute

Credit only available for projects using the EA prescriptive path’

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