New Mexico Register / Volume XII Issue Number 21 / November 15, 2001

 

TITLE:  14          HOUSING AND CONSTRUCTION

CHAPTER:  11   OTHER BUILDING CODES AND STANDARDS

PART:  11           STANDARD FOR RAMMED EARTH CONSTRUCTION

 

14.11.11.1            ISSUING AGENCY: The Construction Industries Division of the Regulation and Licensing Department.

[14.11.11.1 NMAC – N, 12/15/01]

 

14.11.11.2            SCOPE: This rule applies to construction within the State of New Mexico involving loadbearing rammed earth construction.  This rule is to be read in conjunction with all other statutes, codes, and standards of the Construction Industries Division and the State of New Mexico, except those it expressly amends for the purposes of addressing rammed earth construction.

[14.11.11.2 NMAC – N, 12/15/01]

 

14.11.11.3            STATUTORY AUTHORITY: Pursuant to Section 60-13-9 (F) of the Construction Industries Licensing Act (1978), the Construction Industries Division of the Regulation and Licensing Department has adopted 14.11.11 NMAC.  This section provides as follows:  “The Division shall adopt all building codes and minimum standards as recommended by the trade bureaus and approved by the commission so that the public welfare is protected, uniformity is promoted, and conflicting provisions are avoided;”

[14.11.11.3 NMAC – N, 12/15/01]

 

14.11.11.4            DURATION: Permanent; until later amended, repealed or replaced.

[14.11.11.4 NMAC – N, 12/15/01]

 

14.11.11.5            EFFECTIVE DATE: December 15, 2001, unless a later date is cited at the end of a Section. [14.11.11.5 NMAC – N, 12/15/01]

 

14.11.11.6            OBJECTIVE: The objective of 14.11.11 NMAC is to promote the general welfare of the people of New Mexico by providing for the protection of life an property through standards that, when complied with, will result in a safer structure installation, etc.

[14.11.11.6 NMAC – N, 12/15/01]

 

14.11.11.7            DEFINITIONS:

              A.           Amended Soil: improving an unqualified soil to a qualified state with the addition of other soils or amendments.

              B.           Amendments: additive elements to soil such as lime, Portland cement, fly ash, etc., which are “dry-mixed” into the main soil body as a percentage of total weight to achieve stabilization.

              C.          Buttress: a projecting structure providing lateral support to a wall.  The buttress shall be incorporated into the foundation and wall system.  Refer to Appendix Figure 1.

              D.          Channel: a groove, slot or cavity on the vertical rammed earth wall surface; generally formed prior to ramming or curing.  Refer to Appendix Figure 2.

              E.           Keyway: a groove on the vertical rammed earth wall surface for interlocking purposes.  Refer to Appendix Figure 3.

              F.           Nailer: any material incorporated into the wall prior to ramming that serves as an attachment device. Refer to Appendix Figure 4.

              G.          Optimum Moisture: sufficient water (generally no more than 10%) mixed into the soil to attain sufficient compaction.

              H.          Qualified Soil: any soil, or mixture of soil, that attains 300 p.s.i. compression strength and attains 50 p.s.i. modulus of rupture.

              I.            Rammed Earth: qualified soil that is mechanically or manually consolidated to full compaction.

              J.           Stabilization, Stabilized: qualified soils that pass the wet strength compression test or contain a minimum of 6% Portland cement by weight.  Stabilization is achieved through the use of amendments.

              K.          Wet Strength Compression Test: an approved testing laboratory process in which a fully cured rammed earth sample is completely submerged in water a minimum of four hours prior to testing.

[14.11.11.7 NMAC – N, 12/15/01]

 

14.11.11.8            STANDARDS FOR RAMMED EARTH CONSTRUCTION

              A.           General

                    (1)     These Standards apply to Seismic Zones 0, 1 and 2B.

                    (2)     Exterior rammed earth walls shall be a minimum of 18 inches in thickness.

                    (3)     Interior rammed earth walls shall be a minimum of 12 inches in thickness. 

                    (4)     Unstabilized rammed earth walls must be covered to prevent infiltration of moisture from the top and sides of the wall at the end of each workday and prior to wet weather conditions, whether in-form or out. 

                    (5)     Fully stabilized rammed earth walls may be left unprotected from the elements. 

                    (6)     In no case shall a rammed earth wall be reduced in thickness with back-to-back channels or nailers. Channels or nailers rammed on both sides of a running wall shall not be opposite each other to avoid an hourglass configuration in the wall section.  Channels or nailers on both sides of a running wall shall be separated from each other vertically at a distance no less than the rammed earth wall thickness.  Refer to Appendix Figure 4.

                    (7)     An architect or engineer registered in the State of New Mexico shall design and seal structural portions of two story residential rammed earth construction documents.

                    (8)     Unless otherwise provided for in this Standard, the following codes are the minimum requirements:  Uniform Building Code (ICBO); State of New Mexico Building Code; Uniform Mechanical Code (IAPMO); Uniform Plumbing Code (IAPMO); New Mexico Plumbing and Mechanical Code; National Electrical Code (NFPA); State of New Mexico Electrical Code; LP Gas Codes; NFPA 54; ANSI; Energy Conservation Code; Any additional codes and standards as may be adopted by the Construction Industries Division.  NOTE:  The current edition of the above codes adopted in the State of New Mexico with applicable New Mexico changes shall apply.  Copies of these codes are on file at the Construction Industries Division

                    (9)     The general construction of the building shall comply with all provisions of the Uniform Building Code (UBC) unless otherwise provided for in this Standard.

              B.           Rammed Earth Construction Standards

                    (1)     Rammed Earth Wall Height To Thickness Ratio.  Rammed earth walls heights shall be determined as follows:  Refer to Table 8.B.1 to determine wall height to wall width ratios.  Wall heights shall be measured from the top of the supporting stem wall to the top of the bond beam.  Wall heights and thickness ratios other than that provided in Table 8.B.1 require sealed calculations and/or drawings by a structural or civil engineer registered in the State of New Mexico.

Table 8.B.1 - Rammed Earth Wall Height To Thickness Ratio

Rammed Earth Wall Thickness in Inches

Maximum Wall Height

121

6’ - 0” (without bond beam)

121

8’ - 0” (with bond beam)

18

10’ – 8”

20

11’ – 4”

22

12’ – 0”

24

12’ – 8”

112-inch thick rammed earth walls are limited to interior partition walls.

2Rammed earth walls < 6’- 0” in height do not require a bond beam on top of wall

3Rammed earth walls > 6’- 0” in height require a bond beam on top of wall

                    (2)     Rammed Earth Wall Lateral Support.

                              (a)     Lateral support shall occur at intervals not to exceed 24 feet. Rammed earth walls 18 to less than 24 inches thick shall be laterally supported with any one or combination of the following:  A rammed earth wall of bond beam height that intersects the running wall with at least 60 degrees of support (Refer to Appendix Figure 5);  An adobe wall of bond beam height and at least 14 inches in width that intersects with and attaches to the running wall with at least 60 degrees of support (Refer to Appendix Figure 5);  A minimum 20 gauge steel frame or wood frame wall of full height that intersects with and attaches to the running wall with 90 degrees of support that is properly cross braced or sheathed (Refer to Appendix Figure 6);  A buttress configuration that intersects the running wall at 90 degrees of adobe or rammed earth.  The buttress base must project a minimum of 3 feet (or 33% of the wall height) from the running wall and support at least 75 percent of the total wall height (refer to Appendix Figure 7).  The thickness of a rammed earth buttress shall be at least 18 inches.  The thickness of an adobe buttress shall be a minimum 14 inches.

                              (b)     Rammed earth walls greater than 24 inch in thickness are self-buttressing and do not require lateral support.

                    (3)     Openings. 

                              (a)     Door and window openings shall be designed such that the opening shall not be any closer to an outside corner of the structure as follows:  In rammed earth walls 18 to 24 inch thick, openings shall not be located within 3 feet of any corner of the structure (Refer to Appendix Figure 8). Exception: openings may be located within 3 feet of any corner provided a buttress extending at least 3 feet from the structure supports the corner. A continuous footing below and a continuous bond beam above shall be provided across such openings.

                              (b)     Rammed earth walls greater than 24 inches thick are self-buttressing with no special consideration for openings within  the area of the wall.

                              (c)     Rammed Earth Piers supporting openings shall measure no less than 3 square feet in area.  No dimension shall measure less than 18 inches (Refer to Appendix Figures 9-A and 9-B).

                    (4)     Foundations. 

                              (a)     Foundation construction shall comply with adopted code provisions and the following:  A minimum of three continuous #4 steel rebar are required in footings supporting rammed earth walls. Stem walls will be the full width of the wall supported above or wider to receive forming systems.  Footings shall be a minimum of 10 inches in thickness.

                            (b)      For the purposes of placement of perimeter foundation insulation, rammed earth walls may overhang the bearing surface up to the thickness of the perimeter insulation, but in no case greater than 2 inches. 

                             (c)     A keyway shall be provided where the rammed earth wall meets the foundation system. The keyway shall be established at the top of the stem a minimum of 2 inches deep by 6 inches wide formed at the time of the pour, and shall run continuously around the structure to include any intersecting rammed earth wall section.  The rammed earth wall shall be fully rammed into this keyway. Refer to Appendix Figure 2.  Exception: Placement of vertical steel extending a minimum of 12 inches into the rammed earth wall. Vertical steel shall be minimum #4 steel imbedded into the concrete spaced 48 inches on center maximum.

                             (d)     Rubble-filled foundation trench designs with a concrete grade beam above the rubble are allowed to support rammed earth wall construction.  A architect or engineer registered in the State of New Mexico shall certify the rubble-filled foundation design portion.

                    (5)     Rammed Earth Soil Specifications.

                              (a)     Soil Preparation:  Soil shall not contain rock more than 1 ½ inch diameter.  Soil shall not contain clay lumps more than ½-inch diameter.  Soil shall be free of all organic matter.  Soil shall not contain more than 2 percent (2%) soluble salts.

                              (b)     Soil Compressive Strength:  Prior to the start of construction, the rammed earth soil shall be tested at an approved testing laboratory for compressive strength.  Sample tested shall be representative of soil to be used for construction.  The compressive strength report shall be submitted with the permit application.  Ultimate compressive strength of all rammed earth soil shall be a minimum of 300 p.s.i.  Laboratory testing shall indicate rammed earth samples attained a minimum of 200 p.s.i. after 7 days.  Rammed earth soil samples shall be rammed and fully cured prior to submission for testing at an approved testing laboratory.  If a different soil is provided at any time during construction, it must meet minimum compressive strength requirements outlined above prior to use in the structure.

                              (c)     Amended Soil: The following guidelines shall apply when amending soils to attain a qualified soil:  Soil shall not contain rock greater than 1 ½  inch in diameter.  Soil shall not contain clay lumps greater that ½ inch diameter.  Soil shall be free of organic matter.  Soil shall not contain more that 2 percent (2%) soluble salts.  Soils to be mixed shall be sufficiently dry to blend completely to one uniform color.  The amended soil shall be tested and approved by the building official prior to use.  Refer to Section 5(b) for soil compressive strength testing requirements. 

                    (6)     Rammed Earth Soil Stabilization.  The following shall apply to stabilization of rammed earth soil:  Asphalt emulsion may not be used for stabilization of rammed earth soil.  Thorough mixing of additives to the soil may be achieved by any method that assures a complete blending to a uniform color and texture.  Stabilized soil is suitable soil that contains 6 percent or more Portland cement by weight or stabilized soil that passes the wet strength compression test.  Rammed earth soil containing less than 6 percent Portland cement by weight, or rammed earth  soil not passing the wet strength compression test, shall be protected with approved stucco systems or other method approved by the building official.  Refer to Section 14 for weather resistive barrier requirements.

                    (7)     Forming Systems.  The forming system shall be adequate to contain the material under compaction.  It shall be properly plumbed and braced and withstand the soil pressures as well as construction activity on and around it.

                    (8)     Placement Of Material, Compaction And Curing.

                              (a)     No amount of Portland stabilized soil will be mixed that will not be placed in the wall system within sixty (60) minutes of its preparation.

                              (b)     Lifts of prepared soil shall be placed in the forms in relatively even layers not to exceed 8 inches in depth. Each lift shall be rammed to full compaction as required in Section 5(b). 

                              (c)     Optimum moisture content as determined to meet minimum compressive strength shall be maintained for stabilized and unstabilized soils.

                              (d)     Work will progress, lift-by-lift, until the work approaches bond beam height.

                              (e)     Forms may be stripped immediately after ramming is completed for a section of wall provided ramming of adjacent sections does not affect the structural integrity of completed walls. 

                              (f)     Portland stabilized walls not in forms shall be lightly sprayed with water at least five (5) spaced times during daylight hours.  This procedure shall continue for at least three (3) days from the time the wall is exposed to the elements.  Exception: rammed earth walls left in forms three (3) or more days shall not require water spraying.

                    (9)     Placement Of Attachment Materials

                              (a)     Nailers. Nailers incorporated into the rammed earth wall shall be installed as follows (Refer to Appendix Figure 4):  The rammed earth wall shall not be reduced in thickness with back-to-back nailers.  To avoid an hourglass configuration in wall section, nailers on either side of a running wall shall not be opposite each other.  Nailers on either side of a running wall shall be separated form each other vertically a distance not less than the rammed earth wall thickness.  Nailers shall be placed onto the wall such that the narrow dimension of the nailer is exposed on the race of the wall prior to ramming.  Nailers shall be cured and sealed against moisture penetration prior to installation in forms.  The nailers shall not extend the full depth of the wall.  Box wood nailers are not allowed (Refer to Appendix Figure 11).  The nailer shall be no more than 2 inches by 4 inches in dimension.

                              (b)     Channels. Channels may be incorporated into the rammed earth wall as follows (Refer to Appendix Figure 2):  To avoid an hourglass configuration in wall section, channels on either side of a running wall shall not be opposite each other (Refer to Appendix Figure 4).  Channels shall be no more than 2 inches by 4 inches in dimension.  Vertical channels shall not be placed closer than twelve (12) inches to a rammed earth wall finished edge or corner.

                    (10)    Nichos Or Other Shaped Voids.

                              (a)     General.  The depth of the void shall not exceed 1/3 the depth of the rammed earth wall.  The width of the void shall be as defined in Section 3.  Where lintels are required over voids, they shall be installed prior to ramming subsequent lifts.

                              (b)     Voids in stabilized rammed earth walls.  Voids shall not exceed two (2) feet in width.  Voids greater than two (2) feet in width require a lintel or full radius arched opening.  Refer to Section 13 for lintel requirements.

                              (c)     Voids in unstabilized rammed earth walls. Voids shall not exceed one (1) foot in width.  Voids greater than one (1) foot in width require a lintel or full radius arched opening of stabilized rammed earth material.  Refer to Section 13 for lintel requirements. 

                    (11)    Attachments And Connections.

                              (a)   General: Attachments and connections methods of alternate wall construction to rammed earth walls are described as follows:  The building official may approve other attachment and connection methods.  In no case shall two wall types be butted to each other with no consideration for attachment or connection.

                              (b)     Attachment of a rammed earth wall to a rammed earth wall: A keyway, at least 6 inches wide by 3 inches deep shall be formed vertically at the center of the wall section from stem top to underside of the bond beam.  The connecting wall shall be rammed into the keyway.  Refer to Appendix Figure 3.

                              (c)     Attachment of an adobe wall to a rammed earth wall:  Where adobe is deployed as an interior wall that will be incorporated into the rammed earth wall for lateral support, the adobe shall measure a minimum of 10 inches in thickness.  Steel – ladder reinforcement shall be rammed into the wall at the intersection with the adobe wall.  The reinforcement may be bent against the forms during the ramming process.  After ramming is complete and forms removed, the reinforcement shall be incorporated in the adjoining adobe coursing, every four courses minimum (Refer to Appendix Figure 12).  Or, a keyway, not to exceed the depth of the adobe wall, nor 1/3 the depth of the rammed earth wall shall be formed into the rammed earth wall.  The adobe shall be incorporated into the keyway.  (Refer to Appendix Figure 13)

                              (d)     Attachment of a wood or loadbearing steel frame wall to a rammed earth wall:  A ½ inch minimum diameter anchor bolt with 4 inch hook, set in a linear vertical pattern a maximum of 24 inches on center.  The anchor bolt shall be embedded at least 12 inches into the earth wall with the threaded end protruding sufficiently to pass through and attach the adjoining vertical wall stud.  The washer and nut shall be tightened just prior to sheathing the frame wall.  Or, and 18 gauge by 2 inch minimum galvanized strap tie grouted into the concrete bond beam, (or secured to the wood bond beam or wood top plate) securely nailed to the top plate of the frame.  The remainder  of the vertical stud shall be attached to the rammed earth with 30d nails or screws embedded a minimum of 3 inches into the adjacent wall at 8 inches on center vertically.  Refer to Appendix Figure 14. 

                              (e)     Attachment of a door or window unit to a rammed earth wall:  The unit shall be attached to nailers within the opening or nailed or screwed directly into the rammed earth wall.  The nail or screw shall penetrate at least 3-inch penetration into the rammed earth wall.   Heavier units may utilize stronger attachments such as anchor bolts and T-bolts, steel pins, etc. embedded into the rammed earth wall. 

                              (f)     Attachment of rigid insulation to a rammed earth wall:  Galvanized round cap nails shall be used to attach rigid insulation board up to two (2) inches in thickness to the rammed earth wall.  Nails shall penetrate at least 2-inches minimum into the earth wall.  When attaching rigid insulation board greater than two (2) inches in thickness to the rammed earth wall, galvanized round cap nails shall penetrate at least a 3-inch minimum into the wall.

                              (g)     Attachment of cabinetry to a rammed earth wall:  Deck screws shall penetrate a minimum of 3 inches through cabinetry and into a nailer, eight (8) inches on center maximum, or; Deck screws with at least 3 inch minimum penetration through cabinetry and into the rammed earth wall.  Screws shall be spaced horizontally, eight (8) inches on center maximum, on the top and bottom of cabinetry.  Or, all-thread rods or other attachment devices, suitable for attachment of cabinetry  through the rammed earth wall.

                              (h)     Attachment of concrete bond beam to the rammed earth wall: Number 4 reinforcing bar shall be driven into the uncurred wall.  The reinforcing bar shall be set a maximum 20-degree angle along both edges of the wall, staggered no more than 24 inches on center and n closer than 4 inches from the exterior faces of the wall.  The reinforcing bar shall extend a minimum of 12 inches into the rammed earth wall and 4 inches into the concrete bond beam.  Refer to Appendix Figure 16.

                              (i)     Attachment of wood bond beam to the rammed earth wall: One-half inch diameter anchor bolt with 4 inch hook shall be set into the uncured rammed earth wall.  The bolts shall be staggered a maximum of 24 inches on center along both edges of the wall, staggered no closer than 6 inches from the exterior faces of the wall. The bolt shall extend a minimum of 18 inches into the rammed earth wall.

                    (12)    Bond Beams.

                              (a)     General:  The bond beam shall be secured to the rammed earth wall. Refer to Sections 11(h) and 11(i).  Bond beams may be of wood or concrete construction.  Bond beams shall measure 6 inches nominal depth and extend the full width of the wall.  Exception: the bond beam width may be reduced as follows:  2 inches maximum in an 18 to 24 inch thick rammed earth wall;  3 inches maximum in a rammed earth wall 24 inches or greater in thickness.  Bond beams must be continuous, running the full perimeter of the structure.  Interior rammed earth or adobe walls shall be incorporated into the bond beam pour.   Varying height bond beams shall extend into the adjoining rammed earth wall one half the thickness of the adjoining rammed earth wall.  The concrete bond beam may secure anchoring and strapping devices.

                              (b)     Wood bond beam construction: In addition to the general requirements above, wood bond beams shall be constructed as approved by the Building Official.  Light Wood Bond Beam construction maybe utilized as detailed in Appendix Figure 10. 

                              (c)     Concrete bond beam construction: In addition to the general requirements above, concrete bond beams shall be constructed of minimum 2500 p.s.i. concrete and shall contain steel reinforcement as follows: For 18 to 24 inch thick rammed earth wall construction, a minimum of two continuous #4 steel reinforcing bars shall be used.  For walls equal to or greater than 24 inches in thickness, a minimum of two continuous #5 steel reinforcement shall be used.  Provide 2-inch minimum reinforcement concrete cover over all horizontal steel reinforcement.  Concrete bond beams may be used to secure anchoring and strapping devices.

                              (d)     Concrete bond beam cold joints:  Concrete bond beam cold joints are limited to corners or perpendicular intersections with other structural full-height walls.  Cold joints shall be tied into the adjoining bond beam with three (3) #4 steel reinforcement rods.  The reinforcement shall extend a minimum of 24 inches into both portions of the concrete bond beam.   

                    (13)     Lintels Over Openings.

                              (a)     General:  All openings require a lintel or full radius arch over the opening.  All lintels, whether of wood or concrete, shall bear a minimum of 12 inches into the length of the wall and 50% across the depth of the wall.  Exception: nichos and other shaped voids as defined in Section 10. 

                              (b)     Bearing limitations:  Lintels shall bear a minimum of 12 inches beyond coved, splayed or rounded bearing portions of openings that are less than the full width of the wall.  Refer to Appendix Figure 15. 

                              (c)     Lintels over openings in stabilized rammed earth walls:  Openings less than 24 inches in width shall not require a lintel or full radius arched opening.  Openings greater than 24 inches in width require lintels as defined in Table B.

Table B – Concrete Lintels Over Openings in Rammed Earth Walls1

Wall Width-inches

Lintel Span-inches

Lintel Depth-inches

Reinforcement 2

Reinforcement Concrete Cover 3

Uniform

Load

18

24

36

48

60

72

84

96

6

6

6

6

8

8

8

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 5 at 4” oc

3 –no. 5 at 4” oc

3 –no. 5 at 4” oc

3” minimum concrete cover on all sides

1000PLF

20

24

36

48

60

72

84

96

6

6

6

6

8

8

10

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 4 at 4” oc

3 –no. 5 at 4” oc

3 –no. 5 at 4” oc

3 –no. 5 at 4” oc

4” minimum concrete cover on all sides

1350 PLF

22

24

36

48

60

72

84

96

6

6

6

6

8

10

10

3 –no. 4 at 5” oc

3 –no. 4 at 5” oc

3 –no. 4 at 5” oc

3 –no. 4 at 5” oc

3 –no. 5 at 5” oc

3 –no. 5 at 5” oc

3 –no. 5 at 5” oc

3 ½ ” minimum concrete cover on all sides

1700PLF

24

24

36

48

60

72

84

96

6

6

6

6

8

10

12

3 –no. 4 at 6” oc

3 –no. 4 at 6” oc

3 –no. 4 at 6” oc

3 –no. 4 at 6” oc

3 –no. 5 at 6” oc

3 –no. 5 at 6” oc

3 –no. 5 at 6” oc

3” minimum concrete cover on all sides

2000 PLF

1 3000 PSI minimum concrete at approximately 28 days

2 Grade 40 steel reinforcement minimum

3 Steel reinforcement at mid-depth of lintel

                    (14)     Weather-Resistive Barriers.

                              (a)     General:  Stabilized rammed earth walls do not require a weather-resistive barrier or an approved exterior finish.  Unstabilized rammed earth wall require a weather-resistive barrier and approved exterior finish.  When a weather-resistive barrier is installed over the rammed earth wall, it shall not be installed on both sides of a rammed earth wall system.   Exception:  on the top and sided of a parapet wall.

                              (b)     Moisture barrier locations:  A moisture barrier shall protect rammed earth walls adjacent to bath and shower enclosures.  A moisture barrier shall protect rammed earth walls at window sills, the top of parapet, or other exterior wall portions exposed to the elements.  A moisture barrier installed over an exposed parapet top of a rammed earth wall shall lap a minimum of six inches down both sides of the parapet top.

                    (15)     Lath And Plaster.

                              (a)     General:  When non-cementitious plasters are applied directly to the rammed earth wall surface, the surface shall be scored or sandblasted prior to the application of plaster.  Rammed earth walls must cure to a depth of 4 inches minimum prior to application of an approved exterior finish. 

                              (b)     Lath:  Where rammed earth walls have a plaster finish, metal lath shall be installed around interior and exterior wall openings and over dissimilar materials.

                              (c)     Exterior Plaster:  In unstabilized rammed earth walls, stucco netting shall be installed and cementitious plaster shall have minimum of 7/8 inch minimum finished thickness, unless an elastometric “color coat” is used, then it shall have a minimum base coat thickness of 5/8 inch.  Applications shall follow the material manufacturer’ specifications.

                    (16)     Plumbing.

                              (a)     General:  All plumbing installations shall meet all provisions of the Uniform Plumbing Code, Uniform Mechanical Code, and New Mexico Plumbing and Mechanical Code currently in effect within the State of New Mexico, and any other applicable State codes or standards.

                              (b)     Plumbing system installation:  Code compliant plumbing systems may be rammed into the wall system, either vertically or horizontally, provided that such plumbing material is of sufficient strength to withstand the ramming pressures without any rupture or collapse.  Installations shall not reduce the rammed earth wall depth by more than 1/3 the depth of the wall.  Prior to ramming, a minimum 5-inch earth cover is provided over any horizontal pipe.

                    (17)    Electrical.

                              (a)     General:  All electrical installations shall meet all provisions of the National Electrical Code and the State of New Mexico Electrical Code currently in effect within the State of New Mexico, and any other applicable State codes or standards.

                              (b)     Electrical system installation:  Electrical wiring shall pass through a channel or conduit.

Approved rigid or flexible electrical conduit shall withstand ramming pressures without damage or collapse.  Electrical wiring within a channel shall be covered a minimum of 1 Ό inches.  Prior to ramming, a minimum 5-inch earth cover is provided over any horizontal pipe.

                              (c)     UF Cable installation:  UF cable may not be rammed within the rammed earth wall.

Exception:  UF cable installed within an approved conduit or channel.  In a channel installation, UF cable must be covered a minimum of 1Ό inches with plaster, adobe or similar finish.

                              (d)     Electrical box installation:  Plastic electrical boxes shall not be rammed within the rammed earth wall.  Exception:  plastic electrical boxes installed in a channel installation ramming, a minimum 5-inch earth cover is provided over any horizontal pipe.

                    (18)    Appendix Figures. 

[14.11.11.8 NMAC – N, 12/15/01]

 

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9A

Figure 9B

Figure 10

Figure 11

Figure 12

Figures 13 & 14

Figure 15

Figure 16