|Volume 17 Issue 6
Welcome to Dave's Shop Talk's Home Improvement Newsletter of questions from our members on their construction projects, a Tip of the Month and a home remodeling article, both from our website at https://daveosborne.com.
When cutting stair stringers, remember to cut off the bottom of the stringer the thickness of the treads. The stringer is then dropped that thickness from the top floor plus 1 riser.
When installing a landing in a set of stairs, set the landing height at one of the tread heights, so that the risers above the landing are the same as those below the landing.
Since this is not the recommended way of building stairs, the Calculator is not designed to do the drawings for this. However, I'm designed to do this for you. Please send me the total rise, the desired run and the thickness of tread and I'll fool the Calculator into giving you the numbers. Then, I'll re-do the drawings for you.
Here are the drawings, modified, to show the stringer attached flush to the upper floor, attached.
Remember to cut off the thickness of tread, 1 1/8", from the bottom of the stringer and drop it down 1 1/8" from the top of the floor.
I would add a nosing of 1" to each tread or extend the width of each tread by 1" to give a wider tread.
Total Rise entered: 84.3125 inches
Floor Thickness: not entered
Number of rises: 11 rises Number of runs: 11 runs
Height of each rise: 7 21/32 inches
Length of each run: 9 13/16 inches
Total Run: 108 1/32 inches (9'-0 1/32")
Length of board needed for the stringer: 12 feet
Length of opening in upper floor: needs Floor Thickness
Tape measurements (in inches) for the stringer (see diagram):
7 3/4 20 3/16 32 21/32 45 1/8 57 9/16 70 1/32
82 15/32 94 15/16 107 13/ 119 27/32 132 5/16
Copyright © 2019 by David E. Osborne. All Rights Reserved.
Thanks, Don, glad I could help.
In a set of stairs, such as Don's case, where the riser of the stringer is below the box joist, an option to attach the stringers is as shown here:
Notice the 3/4" plywood supporting the stringer to the box joist. Cut 3/4" off the riser of the stringer to allow for the thickness of the plywood. Also, notice 2x4 plate attached to the bottom floor, with the stringer notched over it. Another option I like to do when installing a 1" thick tread is to attach the bottom of the riser to the back of the tread. This helps support the tread between the stringers at the back and the riser top supports the tread at the front. If it is at all possible, install posts under the stringers to take the bounce out.
(taken from our website: DaveOsborne.com)
VERY IMPORTANT! Before working on any electrical modifications of your home read the first article in this series: Electrical 1: Electrical Safety.
A three-way switch is used for turning one or more lights on or off from two different places. For example, turning the light on or off from the top of the stairs and turning it off or on at the bottom of the stairs.
The trick with wiring switches is that you only switch the black or hot wire. You'll notice that in both diagrams, the white or neutral wire goes through the switch boxes and connects to the light - it is not switched. On the 3-way switch, the white wire is used as an extra switch wire and is said to be colored black. Whenever an electrician uses a white wire as a hot wire, he/she will put black tape or colorant on it to distinguish it as a hot wire, rather than a neutral.
Notice in both diagrams that the black wire is used for switching purposes in combination with the red and white wires. The white wire connected to the three-way switch is colored black to show it is not a neutral wire. The black wire from the power source is shown connected to the three-way switch at the common terminal of both switches. This common terminal usually has a red, copper or black screw and the word COMMON stamped on the back of the switch. The other terminals usually have brass screws.
The first drawing shows the wiring of a three way switch with the power source entering the light box.
This second drawing: How to Wire a Three Way Switch Power to Switch shows the wiring for a three way switch when the power source enters one of the three way switch boxes.
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Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.
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