A treatise on architecture and building construction . himney flues should be 8 inches thick if flue linings arenot used, to prevent the smoke becoming chilled too rapidly. 230. Insufficient height causes more smoky and badlydrawing chimneys than any other cause. Chimney fluesshould, whenever possible, extend above the highest pointof the building or those adjoining it. If this is not done,eddies may be formed by the wind passing over the higherparts of the roof and causing a downward draft in the chim-ney flues, under which circumstances they are sure tosmoke. This may be obviated, when the c
A treatise on architecture and building construction . himney flues should be 8 inches thick if flue linings arenot used, to prevent the smoke becoming chilled too rapidly. 230. Insufficient height causes more smoky and badlydrawing chimneys than any other cause. Chimney fluesshould, whenever possible, extend above the highest pointof the building or those adjoining it. If this is not done,eddies may be formed by the wind passing over the higherparts of the roof and causing a downward draft in the chim-ney flues, under which circumstances they are sure tosmoke. This may be obviated, when the chimney is notcarried high enough, by using a hood having two open are unsightly in their appearance, and their useshould be avoided when possible. 331. Chimneys were formerly pargeted, as it was called;that is, the partitions, or ivithes, of a chimney were plasteredwith a mixture of cow manure and lime mortar. This isnow seldom or never used; if it is deemed necessary toparget the inside of a chimney, Portland cement makes the 126 MASONRY. Fig. 94. MASONRY. 127 best material to use. This is not affected by heat and willprevent sparks or air passing through the cracks, and alsoincreases the draft. When an iron or fireclay tile pipe isused, pargeting is unnecessary. 333. During the building of a chimney, pieces of brick andlumps of mortar will drop down in the flue; therefore, a holeshould be left at the bottom, with a board put on a slant tocatch the falling mortar. After the chimney is topped out,the board and mortar can be removed and the hole bricked up. Where bends occur in the flue,openings should be left in the wallto clean out any pieces of brick ormortar that may have lodged there. 233. Fig. 94 shows verticaland horizontal sections of a doublechimney running through fivestories, with fireplaces on each section a-b shows the way thechimney is topped out and thearrangement of the flues. Thefireplaces on the diff^erent stories,and the run of the flues
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