Using
the above diagram as an example, figure the amount
of wallcovering that will be needed to hang the
room. The figure of 384 square feet has not taken
into account the square footage of the doors and
windows. Subtract the actual square footage of
each opening - 21 square feet for the door, and
12 square feet for each of the windows. 384 square
feet - 45 square feet (21 + 12 + 12 = 45) = 339
square feet of wallspace that will be covered
with wallcovering. If you are using a wallcovering
with a pattern repeat of 8 inches, figure that
each metric single roll will contain 22 square
feet of usable wallcovering, 339 square feet (the
amount of wallspace from above that will be hung)
divided by 22 square feet (from Usable Yield Chart)
which equals 15.4, or round up to 16 metric single
rolls that will be needed to hang the example
toom (8 metric rolls).
The
equation would look like this:
384
sq. ft. (room size)
-21 sq. ft. (one standard door)
-12 sq. ft. (one standard window)
-12 sq. ft. (one standard window)
=339
sq. ft. of wallspace that will be hung
339
sq. ft. / 22 sq. ft. = 15.4 msr to hang the room,
rounded up to 16 msr.
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Stairways
or Cathedral Walls
When
estimating a wall that has a diagonal, remember
there will be extra waste to allow for the slope
of the steps or the ceiling pitch. There are two
different types of stairways to figure: one with
a horizontal ceiling line, and the second with
a diagonal ceiling line that parallels the fall
of the steps.
In
both cases, the first step is to divide the wall
in either squares or rectangles to determine the
square footage. In the figure given above, the
upstairs ceiling height is 8", and the downstairs
ceiling height is 8". These figures are the length
of the wall. Next, measure wall width horizontally
from the top of the stairs to an imaginary vertical
line originating at the bottom of the stairs,
which in the example is 15". Taking the top rectangle,
figure 8" x 15" = 120 sq. ft. Next, figure the
bottom rectangle, 8" x 15" = 120 sq. ft., but
since a portion of this wall area is under the
stairs, multiply the bottom rectangle square footage
by 65%, an industry standard. Add the two figures
together to arrive at the square feet that needs
to by hung with wallcovering. The equation would
look as follows:
8"
x 15" = 120 sq. ft. (top rectangle)
8" x 15" = 120 sq. ft. x 65% = 78 sq. ft. (bottom
rectangle)
120 sq. ft. + 78 sq. ft. = 198 sq. ft.
Once
you have the square footage figured, estimate
the amount of wallcovering just as you would for
an ordinary room, finding the usable square feet
for the particular pattern from the Usable Yield
Chart and then dividing the total square feet
by that figure.
For
example, if using a wallcovering with repeat of
14", each msr would contain 20 square feet of
usable wallcovering. The equation would look as
follows: 198 sq. ft. / 20 sq. ft. = 9.9 msr rounded
to 10 msr. If the stairway has a sloping ceiling,
do as the first example in finding the width and
length of the imaginary rectangle or square. The
next step is to take both of these rectangle/square
figures multiplied by 65% to find the square feet
of wall area. The equation would look as follows:
8"
x 15" = 120 sq. ft. (top rectangle)
8" x 15" = 120 sq. ft. (bottom rectangle)
120 sq. ft. + 120 sq. ft. = 240 sq. ft.
240 sq. ft. x 65% = 156 sq. ft. of wall area to
be covered
Using
the same pattern with a repeat of 14", each msr
would contain 20 square feet of usable wallcovering
and the equation would look as follows:
156
sq. ft. / 20 sq. ft. = 7.8 msr rounded to 8 msr
A
cathedral ceiling would be estimated thesame way,
squaring the top rectangle, multiplying the square
feet by 65%, then adding that figure to the square
feet of the bottom rectangle.
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Estimating
Commercial Square Footage
After
the wallcovering has been determined from the
specification, now figure the square footage and
how much is needed for the job. Once the width
is known, the number of square feet in a lineal
yard for that particular wallcovering width can
be determined. An important formula to remember
is:
- Width
divided by 12 = number of feet
- Number
of feet multiplied by 3 (1 yard) = square feet/width
(square feet per lineal yard)
- Divide
square feet of wall space to cover by square
feet/width
For
example:
- 54-inch
wide material used to cover 1500 square feet
is figured
- 54
divided by 12 = 4.5
- 4.5
multiplied by 3 = 13.5 square feet per linear
yard
- 1500
divided by 13.5 = 111.11
1500
square feet of wall space would require 112 yards
without waste.
Once
the width and the square footage for the width
is known, any amount can be determined. If the
yardage for a particular width is known, and the
width of the material is changed, to convert from
one width to another, work backward to determine
the yardage.
For
example:
- 150
yards of 54-inch wide material
- 54
inches is 13.5 square feet per yard (54/12
= 4.5 X 3 = 13.5)
- 150
yards multiplied by 13.5 = 2,025 square feet
of wall space to cover
New
width is 36 inches wide
- 36/12
= 3
- 3
X 3 = 9 square feet
- 2,025
divided by 9 = 225 yards of 36-inch wide wallcovering
instead of original 150 yards of 54-inch material.
These
are exact yardage amounts and do not allow for
waste caused by pattern repeat. A 10 percent waste
factor is a good figure to consider; however,
a matching pattern with a large repeat would require
additional material compared to a textured pattern
without a match. All contractors should be aware
of the pattern, width, and match before submitting
final cid and figures.
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