Statutes, codes, and regulations
Code of Massachusetts Regulations
Department 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDSChapter CHAPTER 51 - MASSACHUSETTS RESIDENTIAL CODE
Chapter 6 - WALL CONSTRUCTION
Subsection R602.10

780 CMR, ch. 51, ch. 6, R602.10

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Current through Register 1536, December 6, 2024
Subsection R602.10

Add the following exception to R602.10 Wall bracing:

Exception: Unconditioned single-story rooms of areas less than 600 ft2 thermally isolated from conditioned space.

Revise and delete all of Exception #2 in - R602.10.2.2.1 Location of braced wall panels in Seismic Design Categories D0, D1 and D2

Revise and replace section R602.10.3 Required length of bracing, as follows:

R602.10.3Required length of bracing.

The required length of bracing along each braced wall line for all detached buildings and townhouses shall be determined by using Table R602.10.3(1) and the applicable adjustment factors in Table R602.10.3(2).

Revise and replace section R602.10.4.3 Braced wall panel interior finish material Exception #3 as follows:

Exception #3 - Except for Method LIB, gypsum wall board is permitted to be omitted provided that the required length of bracing in Tables R602.10.3(1) is multiplied by the appropriate adjustment factor in Table R602.10.3(2), unless otherwise required by Section R302.6.

Revise and replace R602.10.4.4 Panel joints - Exception #1 as follows:

Exception #1. For methods WSP and CS-WSP, blocking of horizontal joints is permitted to be omitted when adjustment factor No. 8 of Table R602.10.3(2) is applied.

Revise and replace Table T R602.19.5 as follows:

TABLE R602.10.5 MINIMUM LENGTH OF BRACED WALL PANELS

METHOD

(SeeTable R602.10.4)

MINIMUM LENGTHa (inches)

CONTRIBUTI NG LENGTH (inches)

Wall Height

8 feet

9 feet

10 feet

11 feet

12 feet

DWB, WSP, SFB, PBS, PCP, HPS, BV-WSP

48

48

48

53

58

Actualb

GB

48

48

48

53

58

Double sided = Actual Single sided = 0.5 × Actual

LIB

55

62

69

NP

NP

Actualb

ABW

ultimate design wind speed < 140 mph

28

32

34

38

42

48

CS-G

24

27

30

33

36

Actualb

CS-WSP, CS-SFB

Adjacent clear opening height (inches)

<= 64

24

27

30

33

36

68

26

27

30

33

36

72

27

27

30

33

36

76

30

29

30

33

36

80

32

30

30

33

36

84

35

32

32

33

36

88

38

35

33

33

36

92

43

37

35

35

36

96

48

41

38

36

36

100

-

44

40

38

38

104

-

49

43

40

39

108

-

54

46

43

41

112

-

-

50

45

43

116

-

-

55

48

45

120

-

-

60

52

48

124

-

-

-

56

51

128

-

-

-

61

54

132

-

-

-

66

58

136

-

-

-

-

62

140

-

-

-

-

66

144

-

-

-

-

72

METHOD

(SeeTable R602.10.4)

Portal header height

8 feet

9 feet

10 feet

11 feet

12 feet

PFH

Supporting roof only

16

16

16

Note c

Note c

48

Supporting one story and roof

24

24

24

Note c

Note c

PFG

24

27

30

Note d

Note d

1.5 × Actualb

CS-PF

16

18

20

Note e

Note e

1.5 × Actualb

Revise and replace R602.10.10 Cripple wall bracing - as follows:

R602.10.10Cripple wall bracing. Cripple walls shall be constructed in accordance with Section R602.9 and braced in accordance with this section. Cripple walls shall be braced with the length and method of bracing used for the wall above in accordance with Tables R602.10.3(1), and the applicable adjustment factors in Table R602.10.3(2), except that the length of cripple wall bracing shall be multiplied by a factor of 1.15. Where gypsum wall board is not used on the inside of the cripple wall bracing, the length adjustments for the elimination of the gypsum wallboard, or equivalent, shall be applied as directed in Tables R602.10.3(2) to the length of cripple wall bracing required. This adjustment shall be taken in addition to the 1.15 increase.

Delete section R603.9.5 Structural sheathing for stone and masonry veneer.

Revise section R606.2.8 Mortar - by deleting "R606.2.8.2 and R606.2.8.3" from the end of the paragraph.

780 CMR, ch. 51, ch. 6, R602.10

Amended by Mass Register Issue 1532, eff. 10/11/2024.