SILLS. 



Smaller satisfactory 4" x 6" sills of cedar, red- 

 wood or Douglas fir should be used in buildings having 

 floor dimensions over 6 feet on each side. If timber of 

 these species is not obtainable, the use of pine is per- 

 missible as a last resort. Never use white or red fir 

 for sills. Xarge buildings, of course, require heavier 

 sills. Since plans for large buildings will be prepared 

 by the District Forester, space will not be given here to 

 the discussion of construction of buildings of this type. 

 If laid on concrete or masonry wall foundations, box sills 

 are thoroughly satisfactory but sills of this type are not 

 acceptable if supported by posts or foundation blocks. 

 Solid sills are adaptable to all conditions regardless of 

 the kind of foundation. They will, therefore, be the 

 standard for the District. 



SQUARING THE BUILDING. 



After placing the sills it is necessary to be 

 sure that they are square. Squaring in small building 

 construction is done by the 3-4-5 method. Measure 

 from the inside corner of a side sill along the inside 

 edge 3 feet and mark. Measure from the same corner along 

 the inside edge of the end sill 4 feet and mark. Now 

 place your measuring stick from one mark to the other. 

 The distance should be 5 feet. If it is more or less 

 than 5 feet, the foundation is not square. Shift the 

 position of the sill until the measurement is exactly 5 

 feet. Check up the opposite corner in the same manner. 

 After the plates are in place and before the rafters are 

 raised, square the plates as described above. Use the 

 figures 6 - 8 - 10 or 12 - 16 - SO to square large build- 

 ings. 



FLOOR JOISTS. 



As a general rule joists for spans longer than 

 4 feet should be of sticks not smaller then 2" x 6". Joists 

 should be free from all knots larger than 1 inch in dia- 

 meter and other defects which would materially weaken the 

 sticks. Fig. No. 2, Cut No. B.M.-6, illustrates the pre- 

 per arrangement of joists on sills. 



B.U. (3 r ) 



