STRUCTURAL 



133 



accumulate and weigh against the brickwork. 

 With weep-holes and drainage there is little fear of 

 bulging. 



Piers add both to the appearance and the 

 strength of a retaining wall, and when carried up 



ELEVATION. 

 DIAGRAM 47. 



to the coping the enlargements may be used for 

 statues and vases, where other conditions are 

 suitable. 



Grass banks are not the most effective method 

 of finishing a terrace. They are best used for the 

 lower ones of a succession, or if the house is of no 

 particular architectural interest. At least 3 ft. 

 of flat grass must be on the top before the slope 

 begins, and in any case a terrace finished by a 

 bank needs to be wider and shallower than one 

 finished by a wall. The bank should be on a slope 

 of 2 to i ; not less, or there will be trouble in 

 keeping the grass, with edges sharply defined top 



