STRUCTURAL MATERIAL 



67 



plate. Iron gutters are rapidly displacing 

 the old-fashioned wood gutters as they last 

 longer, and because they need not be so large 

 and hence cast less shade. 



Fig. 36. Types of gutters. A, and D are wood; B, and 



C are metal. C is supported by two rows of posts 



to allow for a walk directly underneath 



When gutters are used, they have a fall of 

 at least 4 inches for each 100 feet in length. 

 This is accomplished by gradulally shorten- 

 ing the posts toward one end of the house. 

 In other words, the side walls are higher on 

 one end of the house than they are on the 

 other. On very long houses the walls are 



