890 Lord mahon’s Method of 
muft be paid to the rough plafter-work and to the fand 
being moft perfectly dx*y before the boards are laid, for 
fear of the dry-rot ; of which however there is no kind 
of danger, when this precaution is made ufe of. 
§ 13. The method of under-flooring I have alfo ap- 
plied, with the utmoft fuccefs, to a wooden flair-cafe. It 
is made to follow the fhape of the fteps, but no fand is 
laid upon the rough plafter-work in this cafe. 
§ 1 4. The method of extra-lathing may be applied to 
cieling joifts, to floping roofs, and to wooden partitions. 
It is limply this : 
As the laths are going to be nailed on, fome of the 
above mentioned rough plafter ought to be fpread be- 
tween thefe laths and the joifts (or other timbers) againft 
which thefe laths are to be nailed. The laths ought to 
be nailed very clofe to each other. 
When either of the ends of any of the laths laps over 
other laths, it ought to be attended to, that thefe ends be 
bedded found in fome of the fame kind of rough plafter. 
This attention is equally neceftary for the fecond layer 
of laths hereafter mentioned (§15 .). 
§ 15. This firft layer of laths ought to be covered 
with a pretty thick coat of the fame rough plafter fpoken 
of above (§ 9.). A fecond layer of laths ought then to 
be nailed on, each lath being, as it is put on, well fqueezed 
4 and 
