. Field system. o < II. 108 TALL CHIMNEYS 355 The best results in round chimneys are obtainedby having no brick headers below the head of thechimney. Get permission from the Engineer or Archi-tect to use galvanized wire cloth ties instead of brickheaders for bonding the outside 4. This will per-mit backing up full width of wall at once. 356 The shell of a chimney must not be built intoor touch the core, for the expansion of the core wouldcrack and distort the shell. Not less than 1 playmust be left at all points. Too much play betweenshell and core is better than too little. 357 If the plan
. Field system. o < II. 108 TALL CHIMNEYS 355 The best results in round chimneys are obtainedby having no brick headers below the head of thechimney. Get permission from the Engineer or Archi-tect to use galvanized wire cloth ties instead of brickheaders for bonding the outside 4. This will per-mit backing up full width of wall at once. 356 The shell of a chimney must not be built intoor touch the core, for the expansion of the core wouldcrack and distort the shell. Not less than 1 playmust be left at all points. Too much play betweenshell and core is better than too little. 357 If the plans show the shell and the core con-nected in any way except at the bottom, stop the work. 358 Plumb chimneys every 5 0 in height with amercury plumb bob. 359 Examine the mortar of the inside 4 of thechimney from top to bottom every two days, to seethat it is setting fast enough to carry the work beingbuilt above it. 360 Do not economize on mortar. Lay all brick witha shove joint. 361 The temporary hole left for carrying sto
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