102 



MORTAR AND STUCCO. 



The volume of mortar needed in a cubic yard of masonry 

 Is as follows: 



Brick work % in. joints 0.15 cu. yd. 



Brick work % in. joints 0.25 



Brick work % in. joints 0.40 



Ashlar, 20 in. courses 0.06 



Squared stone masonry 0.20 



Rubble masonry 0.25 



For concrete, broken stone 0.55 



To make a good wall plaster, take good double strength 

 lime; slake in plenty of water. Stir the lime only enough 

 to keep the large lumps from burning. It should stand a 

 week or 10 days before using. Put in 2^ bushels of good 

 clean hair to 2 barrels of lime. When ready to commence 

 plastering take 1 barrel of good standard brand Portland 

 cement to 3 barrels of lime. First thoroughly mix the 

 Portland cement with 4 parts of sand; second, the lime 

 mortar should be sanded to the right consistency to make 

 a good rich mortar; third, mix the sanded cement with 

 the lime mortar as it is used. It will take very little mix- 

 ing to make a fine tough mortar. 



For cement stucco for walls, mix 1 part of non-staining 

 Portland cement, 2 parts medium sand, 1 part fine sand, 

 and % part lime flour. When this has set hard, wet the 

 surface thoroughly and apply the second coat with a 

 wooden float. 



For the second coat (^4 in. thick) use 1 part cement, 1 part 

 sand and 2 parts medium sand or crushed granite. Be- 

 fore the second coat has set it can be jointed to present 

 the appearance of stone work. A small addition of lime 

 flour increases the adhesion of the mortar. The finished 

 surface should be protected at least 2 weeks with canvas 

 curtains or bagging saturated with water. Defects will 

 appear if too much cement is used, if not enough mois- 

 ture is applied, if not troweled sufficiently, and if not 

 protected from variations in temperature and drafts of 

 air. 



One barrel of Portland cement covers an area as shown 

 by the following table: 



Thickness Sq. Ft. of 



Composition of Mortar. of Coat. Area Covered. 



1 in. 67 



1 Cement, 1 Sand % in. 90 



% in. 134 



1 in. 104 



