. Cyclopedia of architecture, carpentry, and building : a general reference work. more effective method of bonding is by means of a metal tie, either of steel wire or of non, and these should be made Avith a dip in the centerto allow any moisture which maycome from the outer wall to drop offand not commimicate with the innerwall. (Fig. 113.) These ties shouldbe either galvanized or dipped in hotasphalt. It is a good plan to providefor a circulation of air through thespace between the w^alls, by leavingopenings in the basement and inFiii. 11-2. Hollow Wall. the attic where possible. Hollow biic


. Cyclopedia of architecture, carpentry, and building : a general reference work. more effective method of bonding is by means of a metal tie, either of steel wire or of non, and these should be made Avith a dip in the centerto allow any moisture which maycome from the outer wall to drop offand not commimicate with the innerwall. (Fig. 113.) These ties shouldbe either galvanized or dipped in hotasphalt. It is a good plan to providefor a circulation of air through thespace between the w^alls, by leavingopenings in the basement and inFiii. 11-2. Hollow Wall. the attic where possible. Hollow biicks are sometimes used for the inside course of exterior walls, but, while they are par- tially effective in excludingmoisture, they do not fillthe place of a hollow wallCommon Bricks. We have made free mention ofcommon bricks, facebricks, etc. Let us pauseto consider just what ismeant by the terms. Com-mon bricks include all p^ig. 113. Metal unpressed bricks which have had no special care taken intheir manufacture. These, according to their position in the


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