256 



FARM BUILDINGS IN SOUTH AFRICA 



Small quantities of this mixture, as required, are then thoroughly 

 mixed with a little water and used immediately. 



Cement Mortar. — The cement mortar used for rendering and pointing 

 is made by thoroughly mixing one part cement to two parts clean 

 sand first dry, and then, in small quantities as required, with water, and 

 using at once. 



Important Precautions. — All cement work should be kept damp for 

 a period of ten days after laying by covering it with wet sacks which 

 are rewetted at frequent intervals. This precaution is apt to be neglected, 

 nevertheless it is of prime importance. 



Construction of a Stone Tank. — The tank may be constructed in 

 stone if suitable building stone is available. In this case the tank 





Fig. 200. 



may be built, as shown in Fig. 200, in lime mortar with a backing of 

 clay rammed in behind the stones. The clay should be well puddled, 

 or worked with water, before being rammed into place. The mortar 

 joints between the stones should nowhere exceed £ inch in thickness, 

 and cavities should be filled with chips of stone. 



The inside of a stone tank need not be plastered, but the joints 

 should be pointed with 1 to 2 cement mortar, the lime mortar having 

 first been raked out of the joints to a depth of at least 1 inch. 



List of Materials. — It is difficult, in the case of some of the materials, 

 to estimate the quantity which will be required, as so much depends 

 upon the individual workman in question. The following is an approxi- 

 mate list : — 



