Table Source: OBC

3.1.1.4.(3)For the purpose of substitutions described in Sentence (1),

(a) a maximum of one substitution per dwelling unit may be made if substitutions are made in accordance with Table 3.1.1.4.B, or

Notes to Table 3.1.1.4.B (IP)

1. Where nominal R values are given, then use of corresponding "U" or "effective R" values are permitted.
2. Use only Table 3.1.1.4.B or Table 3.1.1.4.C, not both.