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REMEMBER
--
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The ideal
ratio of riser to tread is 0.7
INV
TAN 0.7 = 35° < ---ideal angle of inclination
r+t = 17
inches
r.t = 70
to 75
there can
be no more than 3/16 of an inch variation in height
of risers i a set of stairs.
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I. Do stairs
in your home fit these quidlines?
To find out, use
a ruler to measure one riser and one tread from TWO sets of
stairs in INCHES and complete the following table:
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Description
of stairs
|
riser height
(in)
|
tread length
(in)
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SLOPE = riser/tread
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Angle
of Inclination |
sum,
r + t
|
product
r . t
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Generally, staircases
do not have to be changed if the angle of inclination is LESS
than the ideal, but they do if the angle is MORE than the
ideal.
Do any of the stairs
in or near Aderhold need to be changed? ____________
II. RESULTS
Write a full paragraph
explaining your results in the chart above. Tell
what you measured,
including a description of the two sets of stairs you investigated
what you calculated
whether or not
your stairs fit the guidelines of the current laws
whether, according
to the angles, the stairs should be changed
III. EVALUATION
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not
yet...
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OK
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master
architect
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| Calculations
are accurate |
1
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2
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3
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4
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5
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6
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Paragraph
is
-complete
-mathematically
correct
-checked
for correct spelling, grammar, etc.
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| TOTAL: |
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_______/15
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