136
MOLESWORTH S FOCKET-BOOK
Asphalte Flooring.
thick requires per super, ft. 12J lbs. asphalte.
” » » Of „
1 in.
i ” ” » v8 r
2 ” " ” ^4 „
Asphalte floors should be laid on a good concrete
foundation 6 inches deep, of 7 of sharp clean gravel
to 1 of lime—no stones larger than a pigeon's
(about 52 lbs. per superficial foot). The inequali-
ties should be flushed up with fine concrete of 6 of
nne gravel (passed through a sieve 5 meshes to the
meh) to 1 of lime passed through a sieve of 10
meshes to the inch.
i concrete should be thoroughly set and dry
le optalte is laid, otherwise the asphalte
will blow. Dry ashes should be swept over the
surface of the concrete to remove moisture.
The asphalte should be heated with wood—coke is
more injurious than coal. The mineral tar should
be first put into the caldron and the asphalu
broken fine and gradually mixed, stirring well.
An excess of tar should be avoided in the
tropics. When the asphalte is ready for use it
. oiild give off light pulls of smoke and drop
freely from the stirrer. The surface while hot
should be sprinkled with chalk powder or fine
sand and stamped well.
q ®,sP^te should be laid in widths of about
d ik’ th? Joints kePt clean and free from dust,
and heated before laying the next width.
Thickness, 1| for goods warehouse.
» 4 for railway platforms.
„ i for arches, &c.
Asphalte should not be used when it is likely to
be saturated with oil or grease.
For repairs, pour hot asphalte over the spot and
allow it to remain till the part to be removed r
softened.