Mechanical Contracting & Plumbing January-December 1909 . be well doneand that good material be used. Thereare many methods and it is difficult topick the best, so much depends on themanner in which the envelope is design-ed, the watchfulness of the inspectorand the conscience of the contractor. cold. Tarred felt and burlap are gen-erally put in as binders, allhuugh thereare cases whese no binders were used,the material being simply run in thejoints and interstices that were left inthe walls. I believe it to be good prac-tice to specify some standard to be at-tained and then to require a speci
Mechanical Contracting & Plumbing January-December 1909 . be well doneand that good material be used. Thereare many methods and it is difficult topick the best, so much depends on themanner in which the envelope is design-ed, the watchfulness of the inspectorand the conscience of the contractor. cold. Tarred felt and burlap are gen-erally put in as binders, allhuugh thereare cases whese no binders were used,the material being simply run in thejoints and interstices that were left inthe walls. I believe it to be good prac-tice to specify some standard to be at-tained and then to require a special bondguaranteeing that the whole work remainwater tight for a period of five a bond given by a bonding com-pany on account of a reliable firm willtend to discourage skimping- the amountand quality of labor and material usedon the work. It is much better to pay-well for a good job at the time of con-struction than to pay twice as muchlooking for a pinhole in the floor sixmonths after completion. Dont evermake the mistake of accepting cement. Interior of Public Comfort Station in Worcester, Mass., Showing Closet withan Integral Local Vent and No Expose d Working Parts. The system most in use is that of tarredfelt and hot pitch, and there have beenexamples of this construction brokenout after 30 years of service againstpressure and found to be still in goodshape. It has the very practical -ad-vantage of being made any thicknessby simply mopping on more pitch andlaying more thicknesses of felt, and be-ing stiff enough to work in and on ver-tical walls without forms, and will gen-erally stay in place until it is conveni-ent to go ahead with the skin walls forits protection. Its one advantage lies inits lack of adaptability when irregularshape, sharp corners, and many pipeoutlets are worked into the plan. Practically all the other good systemsare based on the use of blown oil com-positions and oil refuse under variousnames, some being worked hot and some 7 or concrete, n
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