Statutes, codes, and regulations
New Mexico Administrative Code
Title 14 - HOUSING AND CONSTRUCTIONChapter 7 - BUILDING CODES GENERAL
Part 4 - 2021 NEW MEXICO EARTHEN BUILDING MATERIALS CODE
Section 14.7.4.18 - LINTELS OVER OPENINGS

N.M. Admin. Code § 14.7.4.18

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Current through Register Vol. 35, No. 21, November 5, 2024
Section 14.7.4.18 - LINTELS OVER OPENINGS
A.General. All openings require a lintel or semi-circular arch over the opening. All lintels, whether of wood or concrete shall bear a minimum of two inches into the length of the wall. Exception: nichos and other shaped voids as defined in 14.7.4.15 NMAC.
B.Bearing limitations. Lintels shall bear a minimum of two inches beyond coved, splayed or rounded bearing portions of openings that are less than the full width of the wall. (Refer to Figure 15 of the earthen building figures supplement).
C.Lintels over openings in stabilized rammed earth walls. Openings less than 2four inches in width shall not require a lintel or semi-circular arched opening. Openings greater than 2four inches in width require lintels as defined in Table 4.

Table 4 Concrete Lintels Over Openings in Rammed Earth Walls (1)

Wall width

Lintel span

Lintel depth

Reinforcement (2)

Reinforcement Concrete Cover (3)

Uniform Load

18"

24"

6"

3- #4 @ 4"o.c.

3" minimum concrete cover on all sides

1000 PLF

36"

6"

3- #4 @ 4"o.c.

48"

6"

3- #4 @ 4"o.c.

60"

6"

3- #4 @ 4"o.c.

72"

8"

3- #5 @ 4"o.c.

84"

8"

3- #5 @ 4"o.c.

96"

8"

3- #5 @ 4"o.c.

20"

24"

6"

3- #4 @ 4"o.c.

4" minimum concrete cover on all sides

1350 PLF

36"

6"

3- #4 @ 4"o.c.

48"

6"

3- #4 @ 4"o.c.

60"

6"

3- #4 @ 4"o.c.

72"

8"

3- #5 @ 4"o.c.

84"

8"

3- #5 @ 4"o.c.

96"

10"

3- #5 @ 4"o.c.

22"

24"

6"

3- #4 @ 5"o.c.

3 1/2" minimum concrete cover on all sides

1700 PLF

36"

6"

3- #4 @ 5"o.c.

48"

6"

3- #4 @ 5"o.c.

60"

6"

3- #4 @ 5"o.c.

72"

8"

3- #5 @ 5"o.c.

84"

10"

3- #5 @ 5"o.c.

96"

10"

3- #5 @ 5"o.c.

24"

24"

6"

3- #4 @ 6"o.c.

3" minimum concrete cover on all sides

2000 PLF

36"

6"

3- #4 @ 6"o.c.

48"

6"

3- #4 @ 6"o.c.

60"

6"

3- #4 @ 6"o.c.

72"

8"

3- #5 @ 6"o.c.

84"

10"

3- #5 @ 6"o.c.

96"

12"

3- #5 @ 6"o.c.

1. 3000 psi minimum concrete at approximately 28 days.

2. Grade 40 steel reinforcement minimum.

3. Steel reinforcement at mid-depth of lintel.

N.M. Admin. Code § 14.7.4.18

14.7.4.18 NMAC - Rp, 14.7.4.18 NMAC, 1-28-11, Adopted by New Mexico Register, Volume XXVII, Issue 21, November 15, 2016, eff. 11/15/2016