Securing Buildings agctinjl Fire. 887 
ought to be little more than half as thick as the coat of 
rough plafter applied in the method of fingle under- 
flooring. 
§ 7. In the method of double under-flooring , as faft 
as this coat of rough plafter is laid on, fome more of the 
fhort pieces of laths, cut as above di reefed (§ 4.), muft 
be laid in the intervals between the joifts upon the firft 
coat of rough plafter ; and each of thefe fhort laths muft 
be, one after the other, bedded deep and quite found into 
this rough plafter whilft it is foft, Thefe fhort pieces of 
laths fhould be laid alfo as clofe as poflxble to each other, 
and in the fame direction as the firft layer of fhort laths. 
§ 8 A coat of the fame kind of rough plafter fhould 
then be fpread over this fecond layer of fhort laths, as 
there was upon the firft layer above deferibed. This 
coat of rough plafter fhould (as above directed § 5. for 
the method of Jingle under-flooring') be trowelled level 
with the tops of the joifts, but it ought not to rife above 
them. The fooner this fecond coat of rough plafter is 
fpread upon the fecond layer of fhort laths juft men- 
tioned (§7.) the better. 
What follows, as far as § 13. is common to the method 
of Jingle as well as to that of double under-flooring. 
§ 9. Common coarfe lime and hair (fuch as generally 
ferves for the pricking-up-coat in plaftering) may be 
ufed for all the purpofes before or hereafter mentioned; 
but 
