Stair stringer treads: rise and going
Our stair stringers range from 1-17 treads (steps) and are made for standard ‘rise’ and ‘going’.
The rise is the vertical measurement taken from one step level to the next. Standard rise is 175mm.
The going is the horizontal measurement taken from the front of one step to the next. Standard going is 250mm.
The picture bellow illustrates the rise and going of our stair stringers.
Stair calculator table
To work out the correct size stair stringer, you will need to know your height to deck. This can be found by measuring the vertical distance from the ground level to the height of the deck that you wish to connect.
Note: Also check that there will be enough room horizontally from the face of the deck to where the stringers will be fixed.
Once you have the height to deck measurement you can use the table below to find out which size stringer you need and the cost.
| No. of tread pair | Cost inc. ($) | Height to deck (mm) | Distance from deck (mm) |
| 1 | 117 | 350 | 250 |
| 2 | 127 | 525 | 500 |
| 3 | 142 | 700 | 750 |
| 4 | 172 | 875 | 1000 |
| 5 | 205 | 1050 | 1250 |
| 6 | 240 | 1225 | 1500 |
| 7 | 275 | 1400 | 1750 |
| 8 | 310 | 1575 | 2000 |
| 9 | 345 | 1750 | 2250 |
| 10 | 385 | 1925 | 2500 |
| 11 | 425 | 2100 | 2750 |
| 12 | 460 | 2275 | 3000 |
| 13 | 510 | 2450 | 3250 |
| 14 | 550 | 2625 | 3500 |
| 15 | 595 | 2800 | 3750 |
| 16 | 725 | 2975 | 4000 |
| 17 | 830 | 3150 | 4250 |
How many step will I need? Explained
As explained above we have a rise of 175mm and a going of 250mm for all our stair stringers. So to calculate the number of treads (steps) you will need, we simply take the height to deck measurement and then divide this figure by 175 (rise height). We than take that final figure and subtract 1, as this final figure has given the total amount of rises and not total amount of treads.
Example:
A height of 2100 divided by 175 = 12 minus 1 = 11 treads required.
Certification Requirements
The following is a guide to the requirements for staircase construction and install in class 1 and 10 buildings. This information came from the National Construction Code and Australian Standard AS1657. Some rules differ between habitable room and non-habitable rooms and these differences will be outlined below.
“Habitable room means a room used for normal domestic activities, and—
(a) includes a bedroom, living room, lounge room, music room, television room,
kitchen, dining room, sewing room, study, playroom, family room, home
theatre and sunroom; but
(b) excludes a bathroom, laundry, water closet, pantry, walk-in wardrobe, corridor,
hallway, lobby, photographic darkroom, clothes-drying room, and other spaces
of a specialised nature occupied neither frequently nor for extended periods.”
Habitable Rooms
- No more than 18 rises, before needing a landing of at least 750mm, and no less than 2 rises in a single flight.
- Rises must be between 115mm and 190mm
- Goings must be between 240mm and 355mm.
- The going shall not be more than the tread depth plus a maximum of 30mm between the rear of the tread and the nose of the next tread.
- The slope relationship must be between than 550-700, to find the slope relation double the rise height and then add the going.
- IE. (2 x 175) + 250 = 600
- Risers do not have an opening between them that a 125mm sphere would pass through, see below diagram. This specific rule does not apply to non-habitable buildings.
- Variations between adjacent risers and adjacent goings must not be more than 5mm.
- The largest and smallest riser within a flight, or the largest and smallest going within a flight, does not exceed 10 mm.
None-Habitable Rooms
- Rises must be between 130mm and 225mm.
- Goings must be between 215mm and 355mm.
- Slope Relationship must be between 540mm and 700mm.
- These stairs are also exempt from the 125mm sphere rule.
- Allowance for variation in the rises and goings stays the same.
Note: LevelMaster do not manufacture or sell handrails, landings and spiral staircases, so the relevant certification information for these products has been left out.
Why LevelMaster stringers?
We have designed our stringers to be compatible, without any modification, for both ‘bolt down’ and ‘concrete in’ fixings. This gives you two great advantages, first you can install bolt down stringers without damaging the hot dipped galvanised coating, and also allows you to change your mind and swap the feet at any time of the order. Our stair stringers are sold in pairs (you need 2 stringers per staircase) however treads over 1300mm in length require an extra stringer for support. Refer to our engineering documents.
We take pride in all products and ensure the highest standards in manufacturing. When you buy LevelMaster products, you can always trust that you are buying the best in the business.
Contact us
If you have any further questions about stair stringers, or need help calculating what you’ll need and how much this will cost, Contact LevelMaster. We’d be happy to talk you through your options.
