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~ \;"$& 7 -14 Masonry shall be laid in the following type s of mortar: Type A or B mortar used in foundation walls of hollow masonry units. Type A,B or C mortar shall be used in cavity wall masonry except that TyPe A mortar shall be used in cavity walls having a mortar thickness of ten (10) inches. Type A, B or C mortar shall be used in footings, foundationwalls of solid masonry units, isolated piers, cavity walls exceeding ten (10) inch mortar thicknest and load bearing or exterior walls of hoWlow masonry units. 7-15 The determination of the proportions of cement, aggregate and water to attain the required strengths shall be made by one of the following methods: Concrete made from average materials. When the preliminary tests of the materia1.s to be used are made, the water content per sack of cenent shall not exceed the values set forth in the following table, ASSUMED STRENGTH OF CONCRETE MIXTURES Assumed Compressive Strength at 28 days Yd. p.s.i. 2,000 2,500 3,000 .3,750 Water Content U.~.Gallons Per 94 lb. sack of Cement u. ~. Gallons Sack per Cu. 7 1/2 5 6 3/4 5 1/2 6 6 5 7 In interpreting this table, surface water contained in the aggregate must be included as part of the mixing water in computing the water-cont. Average concrete shall consist of one (1) part .Portland Cement and not more than six (6) parts aggregate, by volume measured dry, and not more than seven and one-half (7!) gallons of water per sack, ninety-four (94) pounds, of cement. : The aggregate shall be mixed in an approximate ratio#, of two and one-half (2!) parts fine aggregate and three and one-half Oi) parts coarse aggregate. Note: 7-16 Structural steel and iron shall comply with the recommendations of the Ameriaan Institute of Steel Construction. 7-17 Soft wood lumber shall meet the grading requirements of the Association reeog- nized in the trade as covering the species under whose grading rules it was produced. This requirement shall not apply to millwork or interior finish. The use of native lumber shall be. permi tted only as directed by the. building inspector. 7-18 Lumber shall be dry and well seasoned. 7-19 Gutters and downspouts where installed shall be of corrosion resisting metals. Solid wood gutters will be acceptable if inside surface is properly protecte d by two(2) coats of pitch, or three 0) coats of lead and oil. 7-20 Approved built up roofing, vertical or edge grain wood shingles, asbestos, slate,; or their equivalent will be accepted. 7-21 Felt material (15# minimum) shall be placed on all parts of every composition -55-