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(b). A building or structure declared unsafe by duly consti- tuted authority set up by the municipality may be restored to safe condition; provided that if the damage Or cost of reconstruction or restoration is in excess of 50% of the value of the building or struc- ture, exclusive of foundations, such building or structure, if recon- structed or restored, shall be made to conform with respect to ma- terials and type of construction, to the requirements for buildings and structures hereafter erected; but no change of use or occupancy shall be compelled by reason of such reconstruction or restoration. The term unsafe building shall include buildings structurally un- safe, unstable or unsanitary; inadequately provided with exit fa- cilities; constituting a fire hazard; unsuitable or improper for the use or occupancy to which they are put; constituting a hazard to heaith or safety because of inadequate maintenance, diiapidation, obsolescence or abandonment; or otherwise dangerous to life, or property. 2 o .' '] . 35 1. Flue connections required. Every gas appliance shall be connected to an effective flue extending to the outer air and con- forming to the provisions of subsection 2 of this section, if it is in- cluded in any of the following classifications. provided that such connections shall not be required for industria( appliances of such size or character that the absence of a connection does not consti- tute a hazard to the occupants SECTION ANCES. (a). A building or structure that may be or shall be found upon inspection to have become dangerous or unsafe, shall, unless made safe and so certified by the building official, be taken down and removed. SECTION The 1949 Edition of the National Building Code recommended by the National Board of Fire Underwriters shall be deemed to be the generally accepted good practice for all matters not covered by this code. , SECTION (c). The live load for which each floor, or part of a floor, of a business building or storage building is designed and approved shall be conspicuously posted in that part of the story to which it applies. 5. UNSAFE BUILDINGS. . .' 4. SUPPLEMENTARY REQUIREMENTS. (a). No building or structure shall hereafter be built, en- larged, altered or moved without a permit from the building official, who may require a plan of the proposed work, together with a state- ment of the materials to be used. (b). The building official shall inspect all buildings or struc- tures during construction to see that the provisions of law are com- plied with and that construction is prosecuted safely. 'Whenever in his opinion, by reason of defective or illegal work in violation of a provision of this code the continuance of a building opera- tion is contrary to public welfare, he may order all further work to be stopped and may require suspension of work until the condi- tion in violation has been remedied. 6. Fireplaces. (a). The back and sides of fireplaces hereafter erected shall be of solid masonry or reinforced concrete, not less than 8 inches in thickness. A lining of fire brick at least 2 inches thick or other approved material shall be provided unless the thickness is 12 inches. (b). Fireplaces shall have hearths of brick, stone, tile or other approved noncombustible material supported on a fireproof slab or on brick trimmer arches. Such hearths shall extend at least 20 inches outside of the chimney breast and not less than 12 inches beyond each side of the fireplace opening along the chimney breast. The combined thickness of hearth and supporting construction shall be not less than 6 inches at any point. (c). Wooden forms or centers used in the construction of that part of the supporting construction which is below the hearth of the fireplace shall be removed when the supporting construction of the hearth is completed. ' (d). Spaces between the chimney and joists, beams or girders and any combustible materials shall be firestopped by filling with noncombustible material. (h). When two or more flues are contained in the same chim- ney, at least every third flue shall be separated by masonry at least 4 inches thick bonded into the masonry .wall of the chimney. Where flue linings are not so separated, the joints of adjacent flue linings shall be staggered at least 7 inches. 5. Use of flues. Chimneys or flues installed for the use of gas appliances but which are not suitable for solid or liquid fuels, shall be plainly and permanently labeled, "THIS FLUE IS FOR THE USE OF GAS BURNING APPLIANCES ONLY." The label shall be attached at a point near where the vent pipe enters the chimney, or with a type B gas vent used in place of a chimney, at a point near where the type B gas vent enters a wall, floor or ceiling. 35. FLUES AND VENTS FOR GAS APPLI- SECTION 3. PERMITS, INSPECTIONS, AND POSTING OF LIVE LOADS. e (d) Rules promulgated as herein provided same force and effect as provisions of this code. (e). Any rule may be amended or repealed by cedure prescribed for the adoption of new rules. . . the same pro- shall n type A, type B or fire clay smooth on the inside. (f). Flue linings shall start from a point not less than 8 inches below the intake, or, in the case of fireplaces, from the throat of the fireplace. They shall extend, as nearly vertically as possible, for the entire height of the chimney and be extended 4 inches above the top or cap of the chimney. (g). Cleanouts for flues or fireplaces shall be equipped with cast iron doors and frames arranged to remain tightly closed when not in use. have the e e . mortar with close fitting joints left