Alternate method of sealing the cover to the floor

TM 38-260

(g) Alternate method of sealing the cover to the floor. Sand tubes may be substituted for the base plate

when it is necessary to have access to the equipment from all sides. Medium weight canvas tubes filled with sand shall

be laid on the polyethylene cover, around the perimeter of the hutment. The tubes shall be 3-1/2 inches in diameter by

12 feet long, either sewn or seamless, and tied at the ends. The tubes shall overlap 6 to 12 inches at each end. Each

vertical support pipe shall be placed over a single power driven stud to retain its position on the floor. Access to the

hutment can be gained by removing the sand tubes from the corner of the hutment at the point of access. The excess

material in the corner fold will allow the side wall film to be raised to allow entrance for machinery removal.

(h) Pipe framework. The supporting pipe framework shall be fabricated of 1 inch diameter unthreaded,

standard weight, black iron pipe. The framework shall be connected together with slip on type rail fittings. Vertical and

horizontal pipe members shall be spaced depending on the final hutment size with a maximum spacing as shown in figure

5-6. If additional support of the polyethylene blanket is necessary, use number 16 gauge wire spaced on 30 inch centers.

Tighten the wire with turnbuckles to obtain the desired tension. Tape the ends of the wire to avoid puncturing the blanket

and secure the wire by twisting it around the horizontal pipe members.

(i) Dehumidifier duct support panel. It may be necessary to construct and install a support panel for the

air duct piping to and from the dehumidification equipment as specified by the procuring agency. The panel should be

constructed of three-fourths inch plywood and secured flush with the outside of the base plate in a location specified by

the procuring agency. The holes in the duct support panel shall not be over one-eighth inch larger than the air duct

piping.

(j) Installation of polyethylene cover. The plastic cover shall be removed from its shipping container and

laid across the framework in such a location so that the cover can be unfolded into its final position. The cover shall be

centered on the framework so that the entrances will be in the correct position. Extreme care should be taken not to

rupture the plastic cover. The cover shall be fitted over the framework and along the base plate with excess material

extending out on the floor. The zipper for the equipment opening must coincide with the ends of the removable section of

the base plate. The material at the corners shall be folded back inside in a position where it will not interfere with the

zipper openings. The cover shall be secured and sealed to the outer edge of the base plate with 1 by 2 inches wood

nailing strips fastened with 8 penny double headed nails on 12-inch centers as shown in figure 5-5. The nailing strip at

the removable base section of the equipment entrance shall be secured with single headed nails so that one half of each

zipper is attached to the permanent section of the base plate and the other half to the removable section.

(k) Repairs. The contractor erecting the hutment shall be responsible for the repair of all ruptures,

punctures, or tears which result from applying the polyethylene cover over the pipe framework. Repairs shall be made by

heat sealing.

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