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

3(X CORK INSULATION
surface*, and then remove all dust, dirt, or loose mortar, before
making preparations to erect a second layer of corkboard in
Portland cement mortar.
Now see that the floor at the base of the wall is free from
obstruction, and is level ; because the first row of corkboards
in the second layer must be applied to the first layer at the
floor, on a level line, so that the corkboards on the entire
second layer are kept in perfect alignment and all vertical
and transverse joints in the upper rows are made to fit close
and are sealed tight.
Prepare suitable Portland cement mortar in reasonable
quantity, saw sufficient corkboards lengthwise down the center
so as to have enough half-width pieces to make one row along
the partition, coat the half-width corkboards on one side with
a half-inch of Portland cement mortar, cut a piece 6 inches
wide and 27 inches long and with it start putting the halfwidth
pieces of corkboard in proper position against the first
layer of <strong>insulation</strong>, slightly press into place and additionally
secure with wood skewers driven obliquely, two skewers per
square foot.
Then start "with a full-width and 9-inch long piece of corkboard
and set the second row of full-size corkboards on top
of the first row, thus breaking vertical joints in the second
layer, and all joints in the second layer with respect to all
joints in the first layer. As each corkboard is set, butt it
tightly at all points of contact against the adjacent boards
and additionally secure to the first layer with wood skewers
driven obliquely, two skewers per square foot. Join the wall
<strong>insulation</strong> tightly with the ceiling, cutting pieces of corkboard
neatly to fit and never use Portland cement mortar to fill in
openings between corkboards or pieces of corkboard.
Give the cement backing ample time to set, say 48 hours,
before applying a finish over the <strong>insulation</strong>.
135.—Second Layer <strong>Cork</strong>board, Against First Layer of
Self-supporting Partition, in Asphalt Cement.—See that the
first layer of corkboard of the self-supporting partition is sol-
idly erected, and presents a reasonably smooth and level sur-
*If necessary, cut oflE any protruding corners or edges of corkboard with a suitable
tool.