How Long Is a Standard Staircase?

How Long Is a Standard Staircase?

The width of the stairs is their length which is measured from side to side. On the basis of the situation and the purpose, the width of the stairs is fixed.

On the concept that two persons in a stair can cross each other the minimum width of the stair is decided by one.

For public buildings the regular traffic moving is more by using the staircase so for that case the width of the staircase will be more and for residential buildings the width can be provided up to the minimum limit.

For the case of residential buildings, the minimum width can be kept at 900 mm and for public buildings, the minimum width can be kept between a range of 1.37 mm to 1.5 mm.

The maximum width for both cases should not exceed 180 mm.

On the availability of your space and budget, the length can be adjusted just one thing is to be best assured that the minimum dimension is maintained.

How Long Do Stairs Need to Be?

According to IRC, the length of stairs needs to be kept at least 36 inches this is the minimum dimension.

You can extend this dimension but should not be less than this dimension.

The length of a staircase or the length of a flight will be equal to the sum of all treads available or in one flight the total run along with the width of the landing.

The length of the staircase will vary on the ceiling height, height of the riser, and width of the tread.

Also Read: All About Vaulted Ceilings | What Is a Vaulted Ceiling | Different Kinds of Vaulted Ceilings

How Long Is a Flight of Stairs?

A set of steps between the two floors or the two landings is known as a flight of stairs.

Flight of stairs can also be known as stairwells or stairways.

Between the floor and landing the continuous series of steps is the flight.

A flight must not have less than 3 risers and must not exceed 15 risers.

7 inches is the standard height of a stair step so a flight of stairs that will be connecting two floors having a floor height of 8 feet normally must have 11 steps.

For most of the homes, the flight of stairs length is kept between a range of 9 to 12 feet.

To find the perfect length of flight of stairs on each floor for your building you have to first measure the height available for each floor of your building, then divide the height of one stair by the height of each floor.

Then count the number of flights of stairs, then multiply the number of flights by the number of stairs available per flight.

The tread depth of the stair is varied generally but the riser height is generally constant. 10 inches will be the lowest tread depth a nosing of a minimum of ¾ inches and not more than 1 & ½ inches should be provided.

For computing the length of a flight of stairs will involve the depth of your tread and the length of the nosing.

On various factors, The length of a flight of stairs depends on the factors that will involve a number of steps and the height of each step along with the width of the stairs.

For calculating the length of flight of stairs the formula c2 = a2 + b2 can be used.

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How Big Is a Flight of Stairs?

In a place where 8 feet ceilings are available 8 feet 8 inches or around 9 inches of flight of stairs are to be provided.

To compute how big the flight of stairs is you have to take the ceiling height and add the joist width which will be framing the ground and the height of the stairs will be terminating there.

Its dimensions will be around 8 inches to 12 inches.

After that add ½ inches to ¾ inches to the thickness of the subfloor.

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How Many Stairs Can You Have Before a Landing?

It is not always the same for the number of stairs before landing. It will depend on the staircase type, the building type, and the landing site.

Residential buildings will have fewer stairs before landing as compared to those made for commercial buildings.

Before landing a staircase made for the residential building will have 12 to 16 stairs before landing depending on the number of floors the building has.

For a commercial building staircase before landing the number of stairs will be 18 to 20 stairs before the landing.

This is so since, for commercial buildings the landing size will be larger and you will need to accommodate more people.

Those staircases that are used in public such as malls, schools, and museums will have different numbers of stairs before landing.

The reason for this is to accommodate more people and the landing’s size.

24 stairs will be there before landing in a school or mall whereas in a museum 32 stairs will be there before the landing.

The number of stairs before landing is also affected by the design of the staircase type.

Like for example a spiral staircase will have four stairs before the landing as the staircase will be wrapped around the circle.

How Long Are Stairs for 12 Foot Ceiling?

Stairs need to be 13 feet long for a ceiling of 12 feet.

If you calculate then first find the number of risers which is done by 12 multiplied by 12’’ then the result is divided by 6” which gives 24.

Then find the number of risers in the flight which is the number of risers divided by 2 which will be 24 / 2 = 12.

Then the number of treads will be 12 minus 1 which will be 11. Now, the total run will be 11 * 10” = 110”.

Now the length of the staircase will be 110” + 42” i.e., 152” or 13’.

21 stairs will be required for a building having a ceiling height of 12 feet, the number of treads in it will be 20 numbers and 14 feet will be the average stringer length for going up.

How Long Are Stairs for 11 Foot Ceiling?

Stairs need to be 12 feet long for a ceiling of 11 feet.

If you calculate then first find the number of risers which is done by 11 multiplied by 12’’ then the result is divided by 6” which gives 22.

Then find the number of risers in the flight which is the number of risers divided by 2 which will be 22 / 2 = 11.

The number of treads will be 11 minus 1 which will be 10. Now, the total run will be 10 * 10” = 100”.

Now the length of the staircase will be 100” + 42” i.e., 142” or 12’.

19 stairs will be required for a building having a ceiling height of 11 feet, the number of treads in it will be 18 numbers and 13 feet will be the average stringer length for going up.

How Long Are Stairs for 10 Foot Ceiling?

Stairs need to be 11 feet long for a ceiling of 10 feet.

If you calculate then first find the number of risers which is done by 10 multiplied by 12’’ then the result is divided by 6” which gives 20.

Then find the number of risers in the flight which is the number of risers divided by 2 which will be 20 / 2 = 10.

The number of treads will be 10 minus 1 which will be 9. Now, the total run will be 9 * 10” = 90”.

Now the length of the staircase will be 90” + 42” i.e., 132” or 11’.

17 stairs will be required for a building having a ceiling height of 10 feet, the number of treads in it will be 16 numbers and 12 feet will be the average stringer length for going up.

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How Long Are Stairs for 8 Foot Ceiling?

Stairs need to be 9 feet long for a ceiling of 8 feet.

If you calculate then first find the number of risers which is done by 8 multiplied by 12’’ then the result is divided by 6” which gives 16.

Then find the number of risers in the flight which is the number of risers divided by 2 which will be 16 / 2 = 8.

The number of treads will be 8 minus 1 which will be 7. Now, the total run will be 7 * 10” = 70”.

Now the length of the staircase will be 70” + 42” i.e., 112” or 9’. 14 stairs will be required for a building having a ceiling height of 8 feet, the number of treads in it will be 13 numbers and 10 feet will be the average stringer length for going up.

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How Long Are Stairs for 9 Foot Ceiling?

Stairs need to be 10 feet long for a ceiling of 9 feet.

If you calculate then first find the number of risers which is done by 9 multiplied by 12’’ then the result is divided by 6” which gives 18.

Then find the number of risers in the flight which is the number of risers divided by 2 which will be 18 / 2 = 9.

The number of treads will be 9 minus 1 which will be 8. Now, the total run will be 8 * 10” = 80”.

Now the length of the staircase will be 80” + 42” i.e., 122” or 10’.

15 stairs will be required for a building having a ceiling height of 9 feet, the number of treads in it will be 14 numbers and 11 feet will be the average stringer length for going up.

Length of Staircase for 10 Foot Ceiling

You will be requiring an 11-foot-long stair with a ceiling of height 10 feet.

For a residential building having a ceiling height of 10 feet the approximate length of flight of stairs will be 11 feet in total.

For a 10 feet ceiling this is the maintained standard length.

Length of Staircase for 8 Foot Ceiling

You will be requiring a 9-foot-long stair for a ceiling of height 8 feet.

For a residential building having a ceiling height of 8 feet the approximate length of flight of stairs will be 9 feet in total.

For an 8 feet ceiling this is the maintained standard length.

Length of Staircase for 9 Foot Ceiling

You will be requiring a 10-foot-long stair for a ceiling of height 9 feet.

For a residential building having a ceiling height of 9 feet the approximate length of flight of stairs will be 10 feet in total.

For a 9 feet ceiling this is the maintained standard length.

Length of Staircase for 12 Foot Ceiling

You will be requiring a 13-foot-long stair with a ceiling of height 12 feet.

For a residential building having a ceiling height of 12 feet the approximate length of flight of stairs will be 13 feet in total.

For a 12 feet ceiling this is the maintained standard length.

How Long of a 2 X 12 Do I Need for Stairs?

A length of 10.5” is used for 2 x 12 treads the boards used should be straight and of high quality.

A 2 x 12 stringer will have 6 feet of unsupported length.

These 2 x 12 boards are used for stringers and treads. The stringer length is used for determining the length of 2 x 12 materials that will be required for building the stair stringer

How Many Feet in a Flight of Stairs?

8-1/2 to 11 feet is the vertical height of a flight of stairs.

The ceiling height along with the ceiling drywall’s thickness plus the upstairs floor joists depth and the upstairs flooring materials’ thickness are all included in the total height.

This is so done because the stairs will go from the downstairs floor to the upstairs flooring.

Like, if one has a ceiling height of 8 feet then the vertical height of the flight of stairs will be 9 feet.

The total run of a flight of stairs will be greatly varying since the depth of the tread is mutative as compared to step height. In order to fit a horizontal space contractor, make adjustments to the tread depth.

Generally average minimum tread depth is kept at 0.83 feet which is generally 5 feet in for the total run.

How to Calculate Staircase Length?

To calculate the staircase length you need to first divide the height of the ceiling by the height of the riser which will give you the number of risers.

Now you will have to divide the number of risers by 2 in order to receive the number of risers in a flight.

Now subtract the number of risers by 1 which will give you the number of tread or going in a flight.

After that multiply the number of treads and tread width which will give you the total run then add the total run along with the landing width which will give you the staircase length or length of the flight of stairs.

Like if an example is taken for finding the length of a staircase with a ceiling of 10 feet.

At first number of risers will be 10 x 12” / 6” which will be 20.

Then the number of risers in a flight will be 20 / 2 which is 10.

Now, the number of treads will be 10 – 1 which is 9.

Now, the total run will be 9 x 10” which is 90”.

Now, the staircase length will be 90” + 42” which will be 132” or nearly 11’.

Average Length of a Staircase; Average Length of Stairs

According to the International Residential Code and other available local building codes, the average length of a staircase is around 3 feet or 36 inches.

Handrails will not be included in this.

If you fulfill this minimum dimension requirement you can make adjustments to your length according to the available space.

Length of Stairs for 10 Foot Ceiling

You need to provide stairs of length 11 feet for a ceiling of 10 feet.

It is used for residential buildings and kept as a standard length.

Length of Stairs for 8 Foot Ceiling

You need to provide stairs of length 9 feet for a ceiling of 8 feet.

It is used for residential buildings and kept as a standard length.

How Long Are Stairs for 8-Foot Ceiling?

For stairs with 8-foot ceilings, the length of the stairs will be 9 feet.

This length is a standard length for going up to an 8-foot ceiling.

Length of Stairs for 9 Foot Ceiling

You need to provide stairs of length 10 feet for a ceiling of 9 feet.

It is used for residential buildings and kept as a standard length.

Length of Stairs for 12 Foot Ceiling

You need to provide stairs of length 13 feet for a ceiling of 12 feet.

It is used for residential buildings and kept as a standard length.

Length of Stairs for 11 Foot Ceiling

You need to provide stairs of length 12 feet for a ceiling of 11 feet.

It is used for residential buildings and kept as a standard length.

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