| Measurements | Assembly | Rules | Calculations | Surprise |
|---|---|---|---|---|
|
What is 1/2 to 1"
Recommended nosing size
|
What is the bottom riser
This riser is cut smaller than than rest
|
What is the ideal unit run and unit rise added together
17 1/2
|
What is 3
Number of risers for a16" total rise
|
What is shims
Cut on two different angles
|
|
What is maximum unit rise
7 7/8"
|
What is the bottom shims
These shims are not driven as hard/ far as the rest
|
What is ideal unit rise
7 1/4"
|
What is 12
Number of units of run required for 80" of headroom on a stair with a 7 1/2" unit rise and a 10" unit run, and a upper floor construction of 10". The total run is 150" and the stairwell is 140" long.
|
What is unit length
The square root of unit rise and unit run
|
|
What is minimum unit run
8 1/4"
|
What is clamps
These can be removed immediately after installing the shims
|
What is total run
Sum of all unit runs
|
What is amount of units not required for headroom on a winder stair.
Subtract 3
|
What is the recommended nosing line on a stringer
2"
|
|
What is walking line
12 to 16"
|
What is the direction to move the router jig.
Left to right
|
What is the number of runs
Subtract 1
|
What is 9"
The unit of run on a stair with a limited run of 139" and a total rise of 120"
|
What is 9 1/4"
The effective depth of a routered 2x10 stringer
|
|
What is minimum effective depth
3 1/2"
|
What is the length of the riser.
1/ 16 th shorter
|
What is upper floor construction
This is added to the desired headroom clearance
|
What is 9.59 "
The unit run on a stair with a stairwell length of 120" a total rise of 101 1/2" , 10" upper floor ,
|
What is cut out, routered, cleated
Three types of stringers
|
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