FOUNDATION. 



Do not place foundation blocks or underpinning 

 further apart than 6 feet on center. Where snovc loads are 

 excessive or where the ground is not firm, place them on 

 4 foot centers throughout. Where underpinning on short 

 centers are necessary, add sufficient material to the lumber 

 order to provide for them. 



Foundations should be either of - 



(a) 6" x 6" heart cedau f redwood or Douglas fir under- 

 pinning, set upon substantial flat stones of sufficient 

 thickness to project at least 4 inches above the ground. 

 Wood blocks should never be used for footings under founda- 

 tion P03t5 



(b) If substantial stones are not available, a masonrj 

 footing should be provided. For masonry use only hard 

 stones, preferably flat ones. All should be carefully im- 

 bedded on their broadest faces in mortar of 1 part cement 

 and 2 parts coarse, clean, sharp sand. Each layer should 

 be well filled and flushed up on both sides and firmly bond- 

 ed together,-. The tops should be made level to receive the 

 underpinning. See Table No. C-4. 



(c) Large .stones of sufficient thickness to raise the 

 will to a height of at least IE inches above the ground.. 



(d) Blocks of masonry or concrete at least 12 inches 

 high, 10 inches wide on top and 16 inches square at the 

 bottom. The top of concrete and masonry blocks should be 

 made level to receive the sills. See Concrete Section and 

 Table No. C-4. 



MATERIALS. 



All structural materials should conform as closely 

 as possible to the specifications given in the builder's 

 list and lumber order list. That minor deviations must 

 sometimes be made is recognized as unavoidable. 



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