of channel plate. Alternate holes, inside right and outside
left or inside left and outside right, are normally used. To
remove a stud, you must gain access to both the inside
and outside screws. Figure 34 shows the location of the
framing members in an end section. The window and
door headers consist of channels that are fastened between
the studs. They serve as a fastening point for siding,
interior finish, and the window or door frame.
5-6. The sidewalls and roof are framed with arch ribs,
purlins, and window headers. The arch ribs are spaced 4
feet on-center and extend from the channel to the ridge or
highest point in the building. Two arch ribs are spliced at
Figure 32. Joint and spline.
the peak with splice plates and bolts to form a complete
arch. The bottom of each arch rib is fastened in the
the top of the joists borders the floor and serves as a
channel plate with sheet metal screws. Headers for the
fastening surface for the end wall studs and arch ribs.
side windows are fastened between arch ribs. Four
Figure 32 shows the arch ribs connected to the channel
purlins are fastened near the top of the arch, as shown in
plate. This channel plate is comparable to the bottom
figure 34.
plate used in a wood frame building.
5-7. Corrugated sheet metal is used to cover the arch.
5-4. The floor is made of 4x8-foot sheets of plywood.
It is fastened horizontally on the side of the arch to cover
Twelve sheets of plywood are placed side by side on the
the area from the lowest purlin to the joist sill. The
joist along each sidewall to cover the length of a 48-foot
curved sheets that cover the top of the arch are placed
building. The two rows of sheets are butted against the
across the purlins. Vents and roof jacks are built into the
channel plates of the side walls. Six sheets of plywood
rounded sheets that are used on the purlins. These sheets
placed end to end fill the remaining 4 feet in the center of
are the same width and length as the others and are
the building. The actual floor width between the channel
interchangeable with them so you can relocate the vents if
plates is 20 feet 1 inch, or 1 inch more than the 2 lengths
necessary.
and 1 width of the plywood sheets used as the floor
5-8. Repairs to the exterior walls usually consist of
covering. This 1-inch space is divided between the two
replacing the seals or retightening the fasteners around the
center joints to allow a 1/2-inch crack between the ends of
doors and windows. Figure 35 shows the shape of a
the side sheets and the edge of the center sheets. These
rubber seal that is used to prevent leaks at a joint made by
joints are protected by the H-shaped metal floor splines,
corrugated metal and a flat surface.
as shown in figure 33. This spline protects the edge of the
5-9. When insulation is used in the walls of the
plywood, keeps the joint clean, and allows for movement
quonset hut, it is fastened to wooden strips that are placed
of the plywood sheets. The wide joint and the slip-on
between the arch ribs. The interior covering consists of
spline make it easy for you to remove the center sheets,
plywood panels, 1/2-inch thick, that are easily bent to fit
which are subjected to the most wear. Only 3 or 4 nails
the inside surface of the arch rib. An H-shaped spline is
are used to fasten a sheet into place. Sixpenny common
used along the sides of the plywood, and a wood strip is
nails are driven through the plywood and into the groove
used to cover horizontal joints. Figure
in the joist. Notice the groove or separation along the top
and bottom of the joist shown in figure 31.
5-5. Walls. The end walls of the hut consist of metal
studs, channel plate, window and door headers, and
corrugated sheet metal siding. The studs set in the
channel are fastened into place with roundhead sheet
metal screws. One screw is placed through the inside
edge of the channel, and another is placed through the
outside edge of the channel. There are 4 screw holes in
the end of the stud, but it is not necessary to fasten
through each of them except to splice two lengths
Figure 33. Splicing channel plates.
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