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Home My WebLink AboutORD341ORDINANCE NO.341 AN ORDINANCE OF THE MAYOR AND CITY COUNCIL OF THE CITY OF APACHE JUNCTION,ARIZONA,REVISING SECTION 2405.OF THE UNIFORM BUILDING CODE,1982 EDITION;REPEALING ANY CONFLICTING PROVISIONS;AND PROVIDING FOR SEVERABILITY. BE IT ORDAINED BY THE MAYOR AND THE CITY COUNCIL OF THE CITY OF APACHE JUNCTION,ARIZONA THAT: SECTION I IN GENERAL That Section 2405.be revised to read as follows: UNBURNED CLAY MASONRY Section 2405.(a).General.The use of unreinforced masonry of unburned clay units shall be limited to buildings of Group R Division 3 and Group M occupancies of no more than one (1)story in height,unless design and structural calculations are submitted by a registered architect or engineer and approved by the building official. (b).Walls.The height of every laterally unsupported wall of unburned clay units shall be not more than ten (10)times the thickness of such walls.Exterior walls,which are laterally supported with those supports located no more than twenty-four (24) feet apart,are allowed a minimum thickness of sixteen (16)inches. Interior walls are allowed a minimum thickness of twelve inches (12").Designed walls may be a minimum thickness of ten inches provided the h/t ratio of ten (10)is maintained. (c).Compressive Strength.The unit(s)shall have an average compressive strength of three hundred (300)pounds per square inch when tested in accordance with ASTM.C67.One sample out of five may have a compressive strength of not less than two hundred -fifty (250)pounds per square inch. (d).Modulus of Rupture.The unit shall average fifty (50) pounds per square inch in modulus of rupture when tested according to the following procedure: 1.A cured unit shall be laid over (cylindrical)supports two inches (2")in diameter,located two inches (2")from each end,and extending across the full width of the unit. 2.A cylinder two inches (2")in diameter shall be laid mid- way between and parallel .to the supports. 3.Load shall be applied to the cylinder at the rate of five hundred (500)pounds per minute until rupture occurs. 3WL4.The modulus of rupture is equal to -Tea W =Load of rupture L =Distance between supports B =Width of brick d =Thickness of brick (e).Soil.The soil used shall contain not less than twenty-five (25)percent and not more than forty-five (45)percent of material passing a No.200 -mesh sieve.The soil shall contain sufficient clay to bind the particles together and shall not contain more than 0.2 percent of water soluble salts. ORDINANCE NO.341 PAGE TWO (f).Classes of Adobe. (1)Treated Adobes.The term "treated"is defined to mean adobes made of soil to which certain admixtures are added in the manufacturing process in order to limit the adobe's water absorption in order for i t to comply with paragraph (j)below. Exterior walls constructed of treated adobe require no addi- tional protection.Stucco is not required. (2)Untreated Adobes.Untreated adobes are adobes which do not meet the water absorption specifications of paragraph 0 ) below.This shall hold even if some water absorption protec- tive agent has been added.The determination as to whether an adobe is treated or untreated is to test for compliance with paragraph (j)below.Exterior walls of untreated adobe are allowed but must comply with paragraph (o)requiring Portland cement plaster applied to the outside.Use of untreated adobes is prohibited within four inches (4")above the finished floor grade,unless an approved vapor barrier is used between wall and stem.Treated adobes may be used for the first four inches (4")above finished floor grade,without a vapor barrier. (3)Other Types of Adobe.This chapter applies to construc- tion with all types of adobe including rammed earch and poured earth adobe.The types of adobe shall meet the specifications in this chapter or similar specifications which are approved by the building official. (g).Mortar:Where treated adobe is required mortar shall be treated or may be Type M or S.Where adobes are allowed to be untreated any adobe mortar may be used and or Type M,S or N. Mortar "bedding"joints shall be full SLUSH type,with partially open "head"joints allowable if surface is to be plastered.All joints shall be bonded (overlapped)a minimum of four inches(4"). (h).Sampling.Each of the tests prescribed in this Section shall be applied to five sample units selected at random from each 5,000 bricks to be used. (i).Moisture Content.The moisture content of the unit shall be not more than four (4)percent by weight. (j).Absorption.A dried four inch (4".)cube cut from a sample unit shall absorb not more than two and one-half percent moisture by weight when placed upon a constantly water saturated porous surface for seven (7)days. (k).Shrinkage Cracks.No units shall contain more than three shrinkage cracks,and no shrinkage crack shall exceed two inches (2")in length or one -eighth (1/8)inch in width. (1).Use.No adobe shall be laid in the wall for at least three (3)weeks after making,dependent on weather conditions. (m).Foundations.Adobes shall not be used for foundation or basement walls.All adobe walls,except as noted under Group M Buildings,shall have a continuous concrete footing at least eight inches (8")thick and not less than two inches (2") wider on each side than the foundation stem walls above.All foundation walls which support adobe units shall extend to an elevation not less than eight inches (8")above the finished grade. Foundation walls shall be at least as thick as the exterior as specified in Section 2405.(1).Where stem wall insulation is used,a variance is allowed for the stem wall width to be two inches (2")smaller than the width of the adobe wall i t supports. ORDINANCE NO.341 PAGE THREE (n).Bond Beam.All exterior adobe walls shall have a continu- ous concrete bond beam with a minimum width of ten inches (10") and a minimum depth of ten inches (10").All concrete bond beams shall be reinforced with a minimum of two (2)No.4 reinforcing rods. (o).Plastering.All untreated adobe shall have all exterior walls plastered on the outside with Portland cement plaster, minimum thickness three -fourths inches (3/4")in accordance with Chapter 47.Protective coatings other than plaster are allowed,provided such coating is equivalent to Portland cement in protecting the untreated adobes against deterioration and/or loss of strength due to water.Metal wire mesh minimum 20 gauge by one inch (1")opening shall be securely attached to the exterior adobe wall surface by nails or staples with minimum penetration of one and one-half inches (1 1/2"). Such mesh fasteners shall have a maximum spacing of sixteen inches (16")from each other.All exposed wood surfaces in adobe walls shall be treated with an approved wood preserva- tive before the application of wire mesh. (p).Piers.A minimum twenty-eight inch (28")wall section shall be required between openings and openings shall not be placed within twenty-eight inches (28")of exterior corners. (q).Partitions of Wood.Shall be constructed as specified in Chapter 25,wood partitions shall be nailed to nailing blocks laid up in the adobe wall or bolted through the adobe wall the height of the partition,with one-half inch (1/2")DIAMETER bolts twenty-four inch (24")on center with large washers or plates,or other approved methods. (r).Wood Lintels.Wood lintels designed to support all imposed loads are permitted up to a maximum span of six feet (6')and shall have a minimum twelve inch (12")bearing. (s).Alternate methods to those provided in this section (Section 2405).may be approved pursuant to Section 105.of the Uniform Building Code. (t).Stresses.All masonry of unburned clay units shall be so constructed that the unit stresses do not exceed those set forth in Table No.24-B.Bolt values shall not exceed those set forth in Table No.24-C. SECTION I I REPEALING ANY CONFLICTING PROVISIONS All ordinances and parts of ordinances in conflict with the provisions of this ordinance or any part of the code adopted herein by reference are hereby repealed. SECTION III PROVIDING FOR SEVERABILITY I f any section,subsection,sentence,clause,phrase or portion of this ordinance or any part of the code adopted herein by reference is,for any reason,held to be invalid or unconstitutional by the decision of any court of competent jurisdiction,such decision shall not affect the validity of the remaining portions thereof. PASSED AND ADOPTED BY THE MAYOR AND CITY COUNCIL OF THE CITY OF APACHE JUNCTION,ARIZONA,THIS 4TH DAY OF DECEMBER ,1984. ENDELL J.CLA MAYOR ORDINANCE NO.341 PAGE FOUR ATTEST: THLEEN CONNELLY CITY CLERK APPROVED AS TO FORM: EXA CITY ATTORNEY