COMMITTED TO SERVING HAMPTON ROADS NORFOLK - VIRGINIA BEACH - CHESAPEAKE - SUFFOLK - PORTSMOUTH - HAMPTON - NEWPORT NEWS

**USE THIS MENU TO LOCATE MORE TIPS FOR EVERYDAY MATH**

- Calculating for Contractors (Estimating Tips, Mark up & Gross Profit)
- Calculating Area & Volume for Geometric Shapes
- Calculating & Estimating Concrete Slabs & Masonry Blocks
- Calculating Brick, Concrete, Footers, and Mortar
- Composite Decks Vs. Pressure Treated Wood
- Calculating Paint & Wallpaper
- Calculating Roofs & Gables (Waste Factors, Felt, Shingles, Nails Etc.)
- Calculating Wall Studs, Drywall, Ready Mix, Tape, Joint Compound, Nails & Screws.
- Calculating Wall Tile & Floor Tile
- Calculating Stairs, Stair Runs, Risers & Stair Terminology
- Calculating Slopes, Soil, Fill Material, Excavation Tips & Color Code for Underground lines

**Calculating Total Run of Stairs**

- After calculating the number of risers you will have, subtract 1 (this will tell you how many treads you will have)
- Multiply Risers (from step 1) by the tread depth. This is your total run.

*Example:* Total run for a set of stairs that will have 8 risers with a tread depth of 10".

- 8 - 1 = 7
- 7 x 10 = 70

(Total Run)

*Example: *Total rise is 27" and you would like to have a riser height of around 6".

- Total rise is 27"
- 27" divided by 6" = 4.5
- Since you cant have 4.5 risers, choose 4 or 5.

27 divided by 4 = 6.75

27 divided by 5 = 5.4" (6.75" is more desirable than 5.4")

**Determining Riser Height**

- Determine "Total Rise" by measuring the distance from the top landing area to the floor, sidewalk or deck surface below. (Consider any flooring to be installed later)
- Divide Total Rise by the desired riser height.
- If the result of step 2 is not a whole number, round up or down to the whole number. And again, divide the total rise by the new :whole number" to determine the riser height. (Remember to comply with codes)

**(Based on 2006 IRC)**

- Maximum Riser Height is 7-3/4".
- Minimum Tread Depth is 11".
- Riser Heights and tread depths should not differ from each other by more than 3/8".
- Minimum Head Room is 6'8"
- Landings must always be at least as wide as the tread depth.