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280 6-21 Concrete shall be poured in a continuous manner whereever possible. Before new concrete is deposited on or against concrete which has set, the form shall be retightened, the surface of the set concrete shall be thorougijly cleaned and wetted but not saturated. The surfaces of thehardened con- crete shall be slushed with a coating of neat cement grout against which the new concrete shall be placed before the grout has obtained its set. 6-13 Exposed surfaces of concrete shall be kept moist for a period of at least five (5) days after being deposited for ordinary dement and two (2) days for ffiigh, early strength "cement. 6-14 Adequate equipment shall be provided for heating the concrete materials and protecting the concrete during the freezing or near freezing weather. No frozen materials or materials containing ice shall be used. 6-15 All concrete materials and all reinforcement, forms, fillers and ground with which the concrete is to came in contact, shall be free from frost. 6-16 Whenever the temperature of the surrounding air is below 400 Fahrenheit, alloconcrete when placed in the forms ahall have a temperature of between 60 and 90 Fahrenheit and shall be maintained at a temperature of not less than 500 Fahrenheit for at least seventy-two (12) hours for normal concrete or twenty-four (24) hours for high, early strength concrete, or for as much more time as is necessary to insure proper:,rate of curing of the concrete. 6-17 The housing, covering, or other protection used in connection with curing of concrete shall remain in place and in tact for at least twenty-four (24) hours after artificial heating is discontinued. 6-18 The use of any chemical for the prevention of the freezing of concrete or the use of any other material for this purpose shall be in accordance with the most accepted general practice for the use of such material. 6-19 The footing under a foundation wall shall be not less than eight (8) inches thick and twenty (20) inches wide. Concrete footings shall be poured into wooden or steel forms constructed for the purpose. 6-20 Masonry exterior basement walls shall be not less than twelve (12) inches in thiclmess. 6-21 All masonry shall be protected against freezing for at least forty-eight (48) hours after being placed. No.frozen materials shall be built upon. 6-22 Masonry walls that meet or intersect'shall be adequately bonded or anchored. 6-23 Door and window openings in masonry walls shall be spanned by well butt- ressed arches or by lintels having bearings proportioned to their loads but not less than four (4) inches. 6-24 During erection, a masonry wall shall be adequately braced and arches tem- porarily supported. 6-25 Splash blocks constructed of concrete or other approved materials shall be installed at the bottom of all downspouts or leaders of buildings con- taining basements, except when downspouts or leaders are connected to sewers or dry wells. -27-