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Stringer
Here is a picture of four stair stringers and the upper stair
stringers laying on the cement floor. The black arrows are pointing to
the stair stringers which are the main support of the stairway design.
Often stair stringers are referred to as carriages for stair horses it
all depends on what part of the country you are from.
The stair stringer needs to be fastened correctly at both the upper and
lower points so the structural load is transferred to correctly. If the
stair stringers are not fastened correctly this could result in a safety
hazard and excesses squeaking as we walked up and down the stairs.
Stair stringers should be made out of a structurally sound piece of
lumber in this picture the stringers are 2 x 14 Douglas fir graded
number one. When selecting stair stringers material at the lumber yard
try to avoid the big knots in the wood. These big knots can result in
weakening the stringers and of course damage to the stairs.
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