ROOF. 



Materials for roofs of different pitches are pro- 

 vided in the list. Use within the respective ranges of 

 elevations the roofs of stated pitches. 



Exception to the above should occur only where 

 snowfall is not a source of hazard as on the southern Forest; 

 and on the Modoc. 



Roof trusses should be well nailed with lOd. nails 

 in 1 inch members and 20d. nails in 2 inch members. Do not 

 over- nail. Five Rails in surface 6" x 6" are enough. 



Rafters and other members of the roof frame should 

 be of selected straight grain lumber; 1st choice Douglas fir, 

 End choice white fir, 3rd choice yellow pine, free from 

 knots and other imperfections. Too much attention cannot 

 be given to the selection of the best sticks of the lumber 

 order for rafters. 



Care should be taken to cut the rafters true in 

 order that they rest firmly on the plate, meet squarely at 

 the apex of the roof. 



Roof projections should be sheeted solid with 

 1" x 12" rough or dressed lumber. 



Rafter ends should be finished in the manner illus- 

 trated by the diagram "Section". 



Use for roof covering either - 



(1) Star A Star red cedar or redwood shingles. 



(2) Shakes of white fir or sugar pine. 



(3) Galvanized iron (see B.M. Page 8). 



(4) Lay shingles 4 or 5 inches to weather on sheeting 

 8 inches on center. Nail them with 3d. fine galvanized 

 shingle nails. Lay the bottom course of shingles double 

 and project it li- inches beyond the sheeting. Allow a 

 1 inch projection of shingles over the barge board trim. 

 Table No. B.M.-2 gives data on shakes. If shakes are used 

 allow l inches projection at eaves and 1 inch projection 

 over barge board trim. 



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