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006 REINFORCED CONCRETE - - 1 part Portland Cement, 2 parts Sand, 4 parts Gravel. > , WATER CONTENT - - Not more than 7i gallons óf water per bag of cement. 3-7. Structural steel and iron shall comply with the recommendations of the America~ Institute of Steel Construction. 3-8. Soft wood lumber tion recognized in the rules it was produoed. or interior finish. shall meet the grading requirements of the ~ssocia- trade as covering the species under whose grading Th~s requirement shall not apply to millwork 3-9. Lumber shall be dry and well seasoned.· 3-l0~ Gutters and downspouts where installed shall be of corrosion re- sisting metals. Solid wood gutters will be acceptable if inside surface is properly protected by two (2) coats of pitch, or three () coat~ of lead and oil. 3-11. Approved built up roofing, vertical or edge grain wood shingles, asbestos, slate, or their equivalent will be accepted. 3-12. Nails for attaching roof covering shall be copper or hot-dipped galvanized nails. 3-13. Tar paper is hereby prohibi~ed for use as roof covering material on roofs of all buildings, with the exception of built up roofs. SECTION 4 CONSTRUCTION 4-1. No building shall be constructed upon any foundation, the footing of which is less than four (4) feet below grade, unless built upon solid rock, and no footing shall rest upon filled or loose earth. 4-2. All buildings shall have foundation wal:J.s of __it_, stone or con- crete, of sufficient size or strength to support the weight imposed. 4-3. No footing under such wall shall be less than elg~t (8) inches thick and twenty (20) inches wide, and all such footings shall be con- structed of concrete. ~~~~ \ 0(2.. . 4-4. Masonry basement walls for frame buildings shall not be less in thickness than eight (1') inches. ,\';t. either 4-5. Every dwelling house hereafter erected shalJ/have a basement or an excavated space under the entire first floor at least three (3) feet in depth, or such building shall be elevated above the ground so that there will be a clear air space of at least two (2) feet between the top of the ground and the bottom of the floor joists. Such space shall in all cases be enclosed but provided with ample ventilation and properly drained.