400 



SPECIFICATIONS 



Anti-Condeusation 

 Lining. 



Flashing. 



Ridge Roll. 



Corner Finish. 



Cornice. 



Gutters. 



Ventilators. 



48. Anti-condensation roof lining shall preferably be used 

 to prevent dripping in engine houses and similar buildings 

 and shall be constructed as follows: Galvanized wire poultry 

 netting is fastened to one eave purlin and is passed over the 

 ridge, stretched tight and fastened to the other eave purlin. 

 The edges of the wire are woven together, and the netting is 

 fastened to the spiking strips, where used, by means of small 

 staples. On the netting are laid two layers of asbestos paper 

 i-i6-inch thick, and two layers of tar paper. The corrugated 

 steel is then fastened to the purlins in the usual way. Three- 

 sixteenth-inch stove bolts with i" x l /%" x 4" plate washers on 

 the lower side are used for fastening the side laps together and 

 for supporting the lining; or the purlins may be spaced one- 

 half the usual distance where anti-condensation lining is used, 

 and the stove bolts omitted. 



49. Valleys or corners around stacks shall have flashing 

 extending at least 12 inches above where water will stand, and 

 shall be riveted or soldered if necessary, to prevent leakage. 



Flashing shall be provided above doors and windows. 



50. All ridges shall have a ridge roll securely fastened to 

 the corrugated steel. 



51. All corners shall be covered with standard corner 

 finish securely fastened to the corrugated steel. 



52. At the gable ends the corrugated steel on the roof 

 shall be securely fastened to a finish angle or channel connected 

 to the end of the purlins or, where molded cornices are used, 

 to a piece of timber fastened to the ends of the purlins. 



53. Gutters and conductors shall be furnished at least 

 equal to the requirements of the following table : 



Span of Roof Gutter Conductor 



Up to 50' 6" 4" every 40' 



50' to 70' 7" 5" " " 



70'- to loo' 8" 5" " " 



Gutters shall have a slope of at least i" in 15'. Gutters and 

 conductors shall be made of galvanized steel not lighter than 

 No. 24. 



54. Ventilators shall be provided and located so as to 

 properly ventilate the building. They shall have a net open- 

 ing for each 100 square feet of floor space of not less than one- 



