3° 6 



ENGINEERING ON THE FARM 



<? 2x8 P/ote 7 



dependent upon the rusting out of the metal, which is 

 nailed or stapled to the building. If the fastening is per- 

 fect, the life of the stucco may be considered rather 

 indefinite. When applied to tile or brick, the bond is 

 harder to make, but if it is well made the finish is 

 altogether durable. To make this bond on tile or brick 

 it is necessary to have the surface clean and free from loose 

 particles, and the surface should be given a paint coat of 

 neat cement just ahead of the man with the trowel. A 



defective stucco job is 

 very difficult to patch, 

 owing to the trouble in 

 matching colors. 



Galvanized iron. Gal- 

 vanized iron may be 

 used on the outside of 

 some buildings, such as 

 barns or sheds. It may 

 be had in plain sheets or 

 corrugated. It is sub- 

 ject to attack from both 

 sides, the weather from 

 without and the con- 

 densation due to animal 

 heat from within. It is 

 made of sheet steel, and 

 the galvanized protec- 

 tion is very thin. It 

 may be had in sheets 

 having corrugations 2^2 

 inches center to center, 

 although other styles are 

 obtainable. The gauges 

 generally used for roofing are Nos. 20 and 22, U.S. Standard. 

 The sheets are made in 5-, 6-, 7-, 8-, 9-, and 10-foot lengths 

 and wide enough to cover 24 inches when laid with a lap 



Fig. 248. Details of construction 



at plate and base of 



plank truss 



