Year: 1871

Increasing the Height of Rooms.
IT is frequently desirable to raise the


roof of dwelling house few feet higher


than it was originally built, for the pur


pose of making sleeping rooms in the at


tic story, or to render the rooms that are


quite too low, more pleasant and airy. But


many builders dare not attempt such


job, unless they take the roof entirely


down. for fear that they may get dead


fall trap on stilts when they have lifted


the roof from its original foundation. 1t


will be found comparatively easy job to


raise the roof of an ordinary building one


foot, OF, six feet, with perfect safety, pro-


vidcd workman will operate understand


iDgly. Let us assume, for example,


that 1t is desired to raise the roof of q


dwelling house, or the roof of one wing,


which is thirty feet long and twenty feet


wide. If the lower ends of the rafters
it will be better to elevate the plates with


the roof, by cutting openings through the


side walls about six feet from each end, to


receive sticks of timber extending across


the building beneath the plates. If the


building has been erected with balloon


frame, there should be three sticks of


square timber, one near each end, and one


near the middle. Let these timbers be


blocked up close to the ur;ler


side Of the plates. The ends of


these sticks need not extend beyond


the outside Of the plates, so as to inter-


tere with the cornice. II there are no


collar leaves secured to the rafters, the


plates must be fastened, temporarily, to


the timbers, to prevent their spreading us


soon as the roof is lifted. The next step


will be to set screw near the end of each


stick of timber, on foundation that will


not topple or sway as soon as it receives


the superintendent pressure Of the roof.


Ii strong iron jack screws cannot be OBJ


tained conveniently, three two inch wooden


bench screws will elevate one side Of a


large or small roof with perfect safety.


The writer has frequently lifted the corner


of thirty by forty foot barn with pair
Of two and one-eighth inch wooden screws.
AS soon as the timbers are secured in their
lift one side, remove board just below
the cornice, and saw off all the studs on
both sides of the building. Let all the
studs at the gable end be sawed in two at
q point nearly in a horizontal line with
the plates, and let the gable end walls and
windows rise bodily with the roof Now,
let the screws be all worked together,
blocking up every inch as fast as the roof
rises. After one side has been elevated six
INCHES, remove the screws to the opposite
side, and elevate it about one foot, keeping
the timbers beneath the plates and we'll
blocked as fast as the roof rises.


In case there should be chimney rest
ing on closet, or on the collar beams sup.
ported by partition, procure another
wooden screw, and set it beneath the chin.
ney. -Four wooden screws will usually
cost no more than the proprietors of jack
screws are accustomed to charge for the
use of a set of screws while performing
such job. If the screws are placed on
the foundation so as to elevate the roof
perpendlcularly, by raising one side six
inches, then the opposite side one foot,
and, after this, lifting each side alternately
one foot, there will be no difficulty in car
rying up the roof in perpendicular di
rection, to any desired hei ight, provid, d
the screws and the blocking are supported
by broad foundation of blocks that will
not rock. Before removing the screws.
see that the blocking is 50 secure that the
roof cannot slip, in case the screws are
not set perpendicularly on the opposite
side. As the roof is lifted, let a plumb
line be frequently employed to determine
whether it is not being carried in any di
rection away from perpendicular line.
In case the entire roof is one inch or more
too far to the north, let the north side be
lifted one foot higher than the opposite
side, and be blocked up; then set the
screws under the opposite side inclining
about one inch per foot in height. By this
means, the roof can be carried in any de-
sired direction, the distance of half
An inch or two inches. If the screws
are always set perpendicularly,
the roof will rise in the right direction.
If, for example, the plates beneath the
roof to be raised were four feet from the
chamber floor, in lieu of square blocks,
make strong platform for each screw to
rest on, by placing four pieces of scantling
two feet long, on the ends, for corner posts,
and mailing stays from the top of one to
the lower end of the another Then, let
The scantl'ng stand on strong planks rest
ing on the floor. A crib can then be car
ried up, on the tops of the corner posts,
with pieces of plank, or studs or boards,
and the foundation will not topple. As
,oon as the roof has been elevated to the
desired hight on one side, let the space in
The side wall be filled by mailing pieces of
studs to the sides Of the pieces attached to
he plates, and the sides of the studs be-
heath. Then lift the opposite side of the
:oof, and secure pieces Of studs to the sides
If any timbers that have been sawed in two.
If studs, when Tapped together, be nailed
irmly, the side wall will be about as strong
IS if the studs were Of one entire piece Of
timber. Should there be partitions ex.
ending FROM the floor to the roof, tear
lway the base boards and saw off the studs
1ear the floor; and let another screw be
Employed to carry up such portions of the
structure, or let q self-acting lever, with a
weight at the farther end, hold the parti-
ion wall up to the desired position as the
:oOf is rising. Zschn0loQist.