Cork insulation; a complete illustrated textbook on cork insulation ...

DIRECTIONS FOR CORKBOARD ERECTION 293
the wall, in a straight line, slightly press the corkboards into
place and securely nail in position to sheathing with gal-
vanized wire nails driven obliquely, three nails per square
foot. Keep the corkboards in perfect alignment, so that the
joints in the rows to follow may fit close and seal tight.
Break all joints between the different rows, by starting
alternate rows with half-length boards, and see that all joints
are butted close and sealed tight. When the opposite end
and the opposite side of the ceiling area is reached, cut pieces
of corkboard neatly to fit and seal with the wall lines of the
room.
Give the Asphalt cement ample time to cool and set, say
12 hours, before erecting another layer of corkboard against
the first, or before applying a finish over the <strong>insulation</strong>.
127.—Second Layer <strong>Cork</strong>board, to First Layer on Ceiling,
in Portland Cement Mortar.—See that the first layer of cork-
board on the ceiling is solidly attached, and presents a reason-
ably smooth and level surface,* and then remove all dust, dirt,
or other foreign material, before making preparations to erect
a second layer of corkboard in Portland cement mortar.
Saw sufficient corkboards lengthwise down the center so
as to have enough half-width pieces to make one row along
one side of the ceiling. Cut a piece 6 inches wide and 27 inches
long with which to start setting the half-width pieces in proper
position to the ceiling area, in a straight line, against the
edge of the wall.
Prepare suitable Portland cement mortar in reasonable
quantity, coat one side of each piece of corkboard with a
half-inch of Portland cement mortar, put each in proper
position against the ceiling, press firmly into place and addi-
tionally secure with galvanized wire nails or wood skewers,
as specified, driven obliquely, three per square foot. Keep
the pieces of corkboard in perfect alignment, so that the joints
in the rows to follow may fit close and seal tight.
Then start with a full-width and 9-inch long piece of cork-
board and set the second row of full-size corkboards adjacent
to the first row, thus breaking all joints in the second layer,
*If necessary, cut off any protruding corners or edges of corkboard with a suitable