CONSTRUCTION NOTES 253 



Total mason hours required for laying brick, 5. 



Total labor hours required for excavation, 6. 



Total labor hours required for mason's helper, 5. 



Labor hours per hundred for laying brick, .833. 



Mason hours required per hundred for laying brick, .833. 



Labor hours required per cubic yard for excavation, 1.33. 



Catch basins (vitrified sewer pipe, see figure 3 on Plate 107). 



Size of vitrified sewer pipe, 12" or 15". 



Labor hours required for complete installation, from 8 to 9. 



Tabulation. The following is a tabulation of statistics taken from a 

 number of undertakings, showing the total hours required per hundred 

 linear feet for the complete installation of drainage lines of various sizes 

 of tile. This labor item includes excavation, laying of pipe and backfill. 



Complete labor required for one hundred linear feet 

 3,000 lin. feet of 4" Agr. tile laid i' deep =i8>^ hours. 

 1,200 lin. feet of 4" Agr. tile laid 3' deep in clay =40 hours. 

 1,152 lin. feet of 4" Agr. tile laid 2^2 to 3' deep in wet weather =47 hours. 



170 lin. feet of 3" Agr. tile laid in stiff clay =38 hours. 

 1, 1 80 lin. feet of 4" Agr. tile laid 2' deep with cinder backfill =31 hours. 



200 lin. feet of 6" Agr. tile laid 3^' deep in loam and clay =50 hours. 

 25 lin. feet of 4" V. S. P. tile laid 2' deep =36 hours. 



516 lin. feet of 6" V. S. P. tile laid 3^2' deep in stony clay =40 hours. 



140 lin. feet of 6" V. S. P. tile laid 2 to 4' deep in loam =22 hours. 



260 lin. feet of 6" V. S. P. tile laid 3^"' deep in loam =38 hours. 



400 lin. feet of 8" V. S. P. tile laid 3 'deep in hard gravel and clay = 5i hrs. 



590 lin. feet of S" V. S. P. tile laid i' deep =26 hours. 

 38 lin. feet of 15" V. S. P. tile laid 3^' deep in old stone road =285 hrs. 



260 lin. feet of 18" V. S. P. tile laid 3 to 7' deep in stony soil =100 hours. 



CONSTRUCTION OF WALKS, TRAILS AND TERRACES 1 



The methods of constructing and draining flagstone walks laid upon 

 a concrete foundation and upon loam with cinder, slag, or stone founda- 

 tion were discussed in a previous installment of these notes. The following 

 discussion is confined to the detailed methods covering the fundamental 

 principles of construction for various types of walks. The construction of 

 terraces has been included in this discussion for the reason that the prin- 

 ciple of terrace construction is similar to that of walk construction, with 

 the exception that the problems of subsurface drainage are similar to those 

 on tennis court areas and other recreation areas. Terraces surfaced with 

 flagstone paving on various types of foundation have the same principles 



1 Albert D. Taylor in Landscape Architecture, July 1923. 



