Principles of sanitation applicable to the construction of new vessels.

Date:
[1949]
Catalogue details

Licence: Public Domain Mark

Credit: Principles of sanitation applicable to the construction of new vessels. Source: Wellcome Collection.

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    99 For information onthe ratproofing of flooring over insulation see Sec. 21.41, p. 76. The duct bulkhead of the catwalk type of air-flow space need not be ratproofed but it should be substantially built and closely fitted to prevent the easy passage of rats. Corners and butt joints should be protected by the application of wooden molding. The air outlets or ports should be covered with atleast 16-gauge perforated metal, 16-gauge expandedmetal, 16 to 18-gauge flattened expanded metal, or 14-gauge steel wire cloth. Portable panels to permit the entrance of an inspector should be provided. DECKHEAD BHD OR SEE NOTE SHELL WIRE MESH AIR OPENING DECK RAT PROOFING INSULATION FIG. 24 The duct bulkhead ofa non-catwalk type of air-flow space (that is, anypart toonarrow forthe passage of an inspector) should be ratproofed by complete coverage or flashing of all gnawing edges. Air outlets or ports should be protected as recom- mended in the previous paragraph and inspection holes should be installed as necessary to permit the observation of all runs of the duct. If the inspection holes are in the surface of the duct, all gnawing edges of the opening and the cover should be flashed. Solid, wooden, external corner posts which are atleast 3-5/8 by 3-5/8 in finished cross dimensions, rounded at the exposed corner, and rabbeted for an overlap by the sheathing of at least 1 are considered satisfactory without metal flashing if the ends of the sheathing are closely fitted. Equivalent construction should be considered on its merits.
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