INDUSTRIAL FUMIGATION AGAINST INSECTS , 



For stripping windows that are only slightly loose several types 

 of materials can be used. Rolls of gummed paper, strips of news- 

 paper smeared with grease or pasted with flour paste, and rolls of 

 unsterilized adhesive or masking tape, known as " fumigators' tape ", 

 all haA'e their place. 



Figure 8. — Skylights and flashings on roof sealed in preparation for fumigation. Ail 

 ventilators must also be sealed. (Photograph furnished by W. D. Reed.) 



Small doors leading to the exterior of the building can be tight- 

 ened by stripping around the edges with any of the materials used 

 for the windows. Large sliding or hinged doors that fit imperfectly 

 can be sealed most effectively by forcing a framework of 2- by 4-inch 

 lumber covered with fiber-reinforced waterproof paper against strips 

 of heavy felt padding (fig. 10). Such a sealing can be used many 

 times. Another method is to caulk the doors with a paste composed 



| W " % - 



I '""%_.:_„„ „ 



^p^fe^jgl^^ 



- ~, 



1 lill * 



5* 



F 



i 



i 



Figure 9. — Windows sealed on the inside with paper. Cracks about unions of rafters 

 and walls are sealed with plastic elastic. (Photograph furnished by W. D. Reed.) 



of 4 parts of asbestos to 1 part of calcium chloride mixed with a 

 little water. The calcium chloride in the mixture will absorb enough 

 moisture from the air to keep the paste pliable and thus insure a 

 tight seal. It is a cheap, yet effective, sealing material and can be 

 easily removed after the fumigation. 



