was applied on wooden frames and all joints were carefully sealed with mineral 

 asphalt. In these units 3,584 square feet of paper was required for the walls in 

 addition to that used for the sealing of windows, ventilators, and doors. If 

 plastic had been used in this operation complete wall surfaces would not have been 

 covered but only cracks and other openings would have been sealed. The size 

 of each of the eight units was 128 by 100 by 14 feet. Materials used accounted for 

 only $67.06 out of a total of $327.70. Labor at 70 cents per hour with supervisory 

 labor at $1.07 an hour made up the difference of $260.64. 



As an additional example of paper and mineral asphalt sealing, the following 

 figures are quoted on a section of the new concrete storages at Newport News, 

 Va. In this operation a total of $15.38 was expended for sealing, out of which ma- 

 terials amounted to $6.28, with 13 hours of labor accounting for $9.10. These 

 warehouses represent a perfect example of tobacco-storage facilities from a fumiga- 

 tion standpoint and only a limited amount of work was necessary to seal them for 

 fumigation. 



Plastic Sealing 



At Norfolk, Va., a single section, 160 by 140 by 17 1 / 2 feet, was completely sealed 

 with plastic. This operation was performed at a total cost of $235.85. Labor 

 was included at the rate of $1 per hour for 54 hours. Materials used — plastic, 

 gasoline and oil for the compressor, and sisalkraft paper and mineral asphalt (used 

 in locations which were inaccessible for the use of plastic because of the arrange- 

 ments of the stored tobacco) — totaled $181.85. The sealing of the Norfolk ware- 

 house included four 12-foot by 14-foot doors, twenty-two 3-foot by 8-foot windows, 

 260 feet of shed flashing, 120 feet of cracks where sheds adjoin the building, and 

 approximately 100 small holes and cracks in the concrete walls of the warehouse. 

 The sealing of this section, it is believed, is comparable with the work performed 

 at Wilmington. The use of plastic resulted in a saving of over $90 as compared 

 with the cost for the established method. In arriving at the amount saved, it 

 should be noted that plastic materials were included at top retail prices and that 

 labor was included at a higher rate than at Wilmington. It can be seen, therefore, 

 that the figures quoted are conservative and that the actual saving was probably 

 greater than that shown. 



The plastic sealing of a warehouse section at North Charleston, S. C, required 

 labor amounting to 6 hours and 10 minutes at $1 an hour. Inside measurements 

 of this section were 160 by 100 by 19 feet. Plastic sealing was applied to the end 

 walls, the two 12-foot by 14-foot doors, and also two small 3-foot by 8-foot doors. 

 Many small holes and cracks in the hollow tile walls were sealed. Materials in 

 this operation, including gas and oil for the compressor, amounted to $72.83. 



In this instance roof flashings, due to their inaccessibility, were sealed with 

 calking compound, asbestos roofing cement, and roofing felt. It is estimated 

 that approximately 20 man-hours was required for this work in order to seal 

 effectively 320 feet of flashing. The cost of this .operation per section amounted 

 to approximately $61 for labor and materials and must be added to the over-all 

 cost for one section. Plastic sealing was not considered practical, as it would have 

 been necessary to use more than 300 feet of hose and the loss of nozzle pressure 

 would have seriously affected the efficiency of the operation. Had it been possible 

 to seal this unit prior to the storage of tobacco, plastic could have been applied from 

 inside the building. The time of application would probably have been reduced 

 but in any event would not have exceeded that required for sealing this flashing 

 area by other methods. 



In quoting the costs of the various plastic operations listed, the price of materials 

 was based on the amount used for the individual section. By purchasing plastic 

 materials in quantity a substantial reduction in price could be obtained. 



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