How to design the stairs of our house? Read our tips! | Mapier
Stair design basics: calculating step riser height, step tread depth, total rise, total run, intermediate platform lengths Very low angle stairway design Stairway rule. On the first stairs I built, I sized them for a 1×8 riser and a 2×8 tread. The IRC ( International Residential Code) calls for a maximum rise (“r”) of 7 ¾” and a .. Get home building tips, offers, and expert advice in your inbox. The following is a rule-of-thumb formula for interior stairs, as specified in the Architectural Graphic Standards. Riser + Tread = inches:
The riser is typically between 15 and 20 cm whilst the tread is calculated using empirical relationships based on the work done by the in addressing the uneveness In fact, with the variation of the slope, the user tends to change the length of the stride in such a way that the work done to overcome a step is equal to the work done to accomplish the same stride on the level. This implies that the increase of the tread corresponds to a reduction of the riser and vice versa.
According to studies by the French architect the effort of raising the foot is vertically double that to move horizontally; given a length of about 64 cm for a comfortable pace on horizontal levelit can deduce that the tread depth of the step must be the result of the subtraction of said length of twice the value of the riser, ie: Where a is the value of the riser and p is the value of the tread.
Here is a short example.
How to Calculate Number of Rise and Treads of Staircase? - Civilology
To cover cm height with a riser of 17 cm the following calculation is made, as mentioned in the previous step, to determine the number of steps: Multiplying the number of steps by the 28cm tread you obtain the plan of the staircase: For stairs that have the handrail, the safety regulations stipulate that it should have a height between 90 cm and 1 m and a minimum distance of 4 cm from the wall. The railing placed on the void must have a minimum height of 1 m and beimpraticable by a 10cm diam sphere DM.
It is commonly accepted that poles must be vertical and not horizontal to avoid the dangerous "ladder effect". What types of stairs? After seeing the rules for correct planning, we can proceed with knowing the types of staircases existing. The most widely used because most comfortable.
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Consisting of two parallel ramps at angle, and an intermediate landing. Very often, the two ramps are connected by steps in a fan shape, to make the most of the space. It can be circular, square or elliptical. The steps are anchored to a supporting structure, said plug or column, fixed to the floor and ceiling. You have to be careful about riser heights. A riser that is too small - say 4 to 5 inches will make a staircase too shallow. A riser over 7.
I remember, in the not too distant past, that an 8 inch riser was allowed! Check your local code as an 8 inch riser may be permitted where you live. Let's pick a random number for the total height distance between two floors. How can you quickly figure out equal risers for this total rise? Bummer, the result is That means you would have 13 risers at 7.
I can tell you that this is unacceptable and someone would trip.How To Calculate The Height Of Riser In Stair Flooring by Learning Technology
The calculation tells us that we NEED 14 risers since we came up with So, let's divide This means our risers need to be 7. Well, you won't find that number on a framing square! Heck don't even try to look for ths on a framing square!
The point is this: See how simple it was to do the math?
How to Calculate Number of Riser and Treads of Staircase?
Always shoot for 7. If you need step-by-step color photos of the stair-building process, you should consider my Stair Building eBook. This helpful guide is the answer to all of your frustration over the stair building process. Click the link and you will be amazed at what you will discover. Stair Building Products Several companies make some products that will make stair building easier.
You will never be able to get away from doing the layout with a framing square but you can eliminate the need for notching stringers or routing grooves for stringers as I always did. Two companies make simple L shaped metal brackets that you nail to the sides of the stringers.
The treads rest on top of these metal brackets. The brackets contain holes on each edge of the L so that you secure the treads and risers. These are very nifty products that allow you to bang together a set of steps in a flash once you have the stringers marked out and cut.
These triangles are adjustable for any tread length and riser height within codes. These create the notched look. You simply nail the treads on top of the triangle blocks. This product is not meant for outdoor deck steps as the wood brackets are not made from treated lumber. The product comes with easy to follow instructions. Perhaps this is why the product is called EasyRiser!
Call this company for information: It involves mathematics, precision, often difficult measuring, and patience. The concept is fairly straight forward - create treads of equal length and risers of equal height in a given space.
However, it confounds many apprentice carpenters!
I can only imagine how a homeowner might feel when faced with creating stairs. The most common stair building errors include: The angle where treads meet risers is simply a 90 degree angle. It just so happens that a standard framing square is permanently set at this angle. Look at Figure 1 for a moment. It is a drawing of a framing square that is resting on the side of a long stair stringer. The tread depth and riser height are not indicated in the drawing.
That is OK, because it doesn't make a difference!. No matter what the measurements are, the angle between them treads and risers will be maintained at 90 degrees. Figure 1 The angle that does change depending upon your situation is the angle of the staircase in relation to the floor lines.
If the staircase is steep, then this angle will be greater.
How to design the stairs of our house? Read our tips!
For example, if you were crazy and built a staircase with a 12 inch tread and riser, then the angle of the stringer to the floor would be 45 degrees. A more common angle is about 37 degrees. You can achieve this if you build a staircase with a 7. You generally don't have to worry about the degrees of this angle? Because the framing square will automatically calculate it for you. Your challenge is to do the math that permits you to create a staircase that gets you as close to the tread and riser limits as set forth in your local building code.
Building Simple Staircases - Ask the Builder
I can't quote for you what the standard is, simply because there are different codes across the nation! That code stipulates that the " If you have existing floors you simply measure the distance from floor to floor where the staircase connects at each floor.
Failure to do this will goof up your measurements if the floors are not level! You can see how important this is by looking at Figure 2.
Figure 2 If you are lucky and have no obstructions in front of the staircase where it hits the lower floor, you can let the staircase "run out" some even measurement. For example, choose a 10 or 11 inch tread. Imagine if you will, that the distance between the two floor levels happens to be If you choose 7. You end up with 15 risers. Remember, you will always have one less tread than risers.