Collar and Tie-heams 157 



roof (Fig. 70). One-, two-, three- or more storied 

 houses are easily and certainly prevented from 

 spreading- since one tier of joists always coin- 

 cides with the foot of the rafters, to which 

 they can be securely fastened. Fortunately, the 

 story- and- a- half house is less constructed than 

 formerly. 



