what is the fomula to cut stair risers?

Answer 1

Measure from landing to landing. Use formula to figure the number of steps for each: distance from landing to landing divided by ideal tread height (7.5") = number of steps (rounded to nearest whole number).
Stair Riser Height Formula: Landing to landing height divided by number of stairs = riser height. Diagram the stairs on paper to decide the number of landings needed.
easy as pi

Answer 2

measure the distance from the landing or door sill to the ground.divide that number by 7 1/2", up to 8".this is how many stairs you will have.

for example:it is 47" from the sill to the ground.divid by 7.5"is 6 with 2" left over.now try to split that evenly among the 6.so 4 stairs will get another 3/8 added and the last two will have 1/4" added.....you end up with 4 stairs with a rise of 7 and 7/8" and 2 stairs with 7 and 3/4".

you want your stairs to stay the same rise as much as possible.the tread(part you step on) shoud be 9".

take a 2by10 and using a framing square put the 9" mark on the edge of board and the 7 7/8" mark on the edge.mark with a pencil.move down the board until you have all the rises marked.you can purchase brass buttons to make the job easier.the screw onto the square and then move along the board edge.

remember to take away the amount of the wood stock that you are gonna use for treads.if useing 2by stock for the treads make sure you cut off a inch and a half from the bottom of the stringer once you have completed cutting it.

it sounds alot harder than it is .youll do fine .practice on a junk board.good luck

Answer 3

A true carpenter would not have made this mistake. Risers and treads should all be uniform. First, calculations need to be based on the total net height from one floor to the next - this is total net rise. I try to stay between 7" and 7+3/4" on the risers and I always like to use 10"-11+1/4" for the treads. You should have at least 30" of clear unobstructed area at the bottom of the stairs. I can quickly tell if a true carpenter framed a stairway just by walking up/down the stairs one time. I would be concerned about a house built by these unqualified carpenters. I would also look at the stair stringers (boards that the notches are cut out of to form the framework for the risers/treads. These should always be cut out of good,straight 2"x12" pc. of lumber. On long runs they should be braced midway with a supporting wall under the mid-span of the stair stringers. You might want to look at the structural framing of your house roof - (attic area), since your stairway was obviously framed by an unqualified carpenter.

Answer 4

Formula For Cutting Stairs

Answer 5

look it up in handyman.com