Installation instructions Granit stairs - Inside area

Laying granite stairs yourself - made easy

Here we explain step by step how private individuals can lay a staircase made of natural stone on a concrete core staircase without much difficulty. All statements without guarantee.
First, you need the following tools:
1 trowel 2015. Spirit level length 60 cm1 Spirit level length 200 cm,
1 rubber hammer 2015. pail 2015. Mortar bucket 90 liter 2015. silicone gun ,
1 Carpenter's pencil
Total cost: approx. 100 €

You also need the following installation material:
Approximately 14 bag Trasszementmörtel to 30 kg, 1 bag trass to 25 kg, 1 bag bonding slurry to 5 kg, 2 cartridges Natural stone silicone in matching color, 1 role Edge insulation strips 2015. calcareous sandstone
Total cost: approx. 200 €
Please note that the amount of trass cement mortar required may vary depending on the staircase shape.

The product links and prices are only for your first orientation; There are many more suppliers with possibly lower prices!

Lay granite stairs

Granite stairs
1. Step - The preparation

Laying in front of the granite steps, some preparations have to be made. First check that all workpieces have been delivered completely and that they are not damaged. Stack the gigs near the stairs onto two squared timbers, numbered on the wall, so that you have the first step forward. Please make sure to stack all parts with their polished surfaces to each other. Bring all necessary tools and building materials to the stairwell. Use a hand brush to clean the concrete core staircase from dust and loose dirt.

Lay granite stairs

Granite stairs
2. Step - The installation plan

Basis of the granite staircases Laying is always the installation plan we have supplied. The red lines and measures stand for the dimensions of your concrete core staircase, the blue lines and dimensions for the step appearances and the green lines for the impact steps or setting steps. By transferring the chains to the stairwell not only a safe installation of the stairs is possible, but also a complete quality control. All supplied workpieces are numbered analogously to the staircase plan.

Lay granite stairs
Lay granite stairs

Granite stairs
3. Step - The marks for the appearance
A. From the zero point to the first level

In order to lay the granite stairs now, the positions from the laying plan must be transferred to the stairwells. We begin by transferring the positions for the leading edges of the steps, which represent the blue measures and lines in the plan. To do this, draw a straight line with the pencil from the corner, which represents the point zero to the first level of the concrete core; Use the 2 Meter Spirit Level as a ruler to make the line straight.

Now you can apply the blue measures from your plan to the line: In our example plan, you would now measure 47,8 cm from the corner, and then draw a vertical line down - and the first step leading edge is set.
For a better overview, we recommend marking these lines with an "A" for appearance.
After that, enter the other blue measures out of the corner measured on the line; in our example, 92,1 - 118,1, etc. up to the first level with 274,1 cm.

Lay granite stairs

Granite stairs
4. Step - The markers for the steps
From the zero point to the last step

Now repeat the same process on the other wall, draw a line from the zero point to the right, enter the blue dimensions and draw a vertical line at the intersections.

Lay granite stairs

Granite stairs
5. Step - The markings of the stages (kicking)

From the laying plan results in the bottom right, which has been planned the steps with a projection, that is supernatant of 2,5 cm. Accordingly, the position of the stages is 2,5 cm behind the leading edge of the steps. So draw 2,5 cm behind each appearance line another line for the positions of the stages and mark these lines for a better overview with an "S".
Please click on the picture to enlarge.

Lay granite stairs

Granite stairs
6. Step - The markers for the step height

In the laying plan the planned height above the finished floor is drawn in each step; For example, in the example plan, 1 contains "+ 18".
But attention:
If there is mostly only the screed, before the first step, draw a line at the level of the planned finishing floor (for tiles usually 15 mm), then measure 18 cm upwards and draw a horizontal line from the first appearance line to the floor Concrete edge of the second stage - this sets the height for the top edge of the first stage. Now you can transfer the horizontal lines for all step heights from the plan to the wall. In order not always have to measure from the ground, it is sufficient to calculate the height difference from one level to the next. In the example case this is always 18 cm.

If all the horizontal lines are drawn, the installation can begin.
The uppermost horizontal line must be approximately flush with the planned height of the upper floor; a few millimeters tolerance can be easily compensated through the mortar bed; but more on that later.

Lay granite stairs

Granite stairs
7. Step - Preparation of the laying material

Before laying the granite stairs, the laying mortar must be prepared. Moisten the first stage concrete with a wet sponge.
Stir a sack of trass cement mortar with a little water in the mortar bucket to form a well-moist but not muddy mortar. This mortar is only for refilling.
Then stir some pure trass cement with water to a thin mass. This pure trass cement later represents the actual gluing of the staircase side.
Lastly, stick slurry in a bucket of water; Here we need a muddy mass. With this adhesive slurry, all backs of the gigs and setting stages are gradually painted, so that all parts can connect to the trass cement on the mortar bed over its entire surface.

Lay granite stairs
Lay granite stairs

Granite stairs
8. Step - mounting the first setting stage (kick kick)

Apply adhesive slurry to the back of the first setting stage and place it on the first wall mark "S". Cut a piece of edge trim strip and place it between the pedestal and the wall to prevent sound transmission.
If you do not have a finished floor yet, place wedges or wood under the setting level and raise the part to the height of the planned finished floor + 2 mm; In the picture, blue wedges were placed under the first setting stage. The setting level should now clearly exceed the first concrete level. Two sand-lime bricks or something similar in front of the setting level prevent the workpiece from slipping forward or falling over during further work.

Now take the trowel and completely fill the gap between the first setting step and the concrete core with the previously mixed trass cement mortar; Take only small amounts of mortar on the trowel, then it is easier.
Then it should look like in the picture.
With this you have completed the first step to the successful granite stairs installation.

Lay granite stairs
Lay granite stairs
Lay granite stairs
Lay granite stairs

Granite stairs
9. Step - Mount the first performance

Next, with the trowel, as in the picture, apply the mixed trass cement mortar over the entire surface to the first concrete step, which is about 5 millimeters higher than the top edge of the setting stage. The setting stage serves as a limit of the mortar forward. Then apply some of the previously thinly mixed trass cement to the whole layer of mortar.
As you can see, laying granite stairs is not that difficult.

Granite stairs
9. 1 The edge insulation strip

As you can see in the picture, insert a piece of edge insulation strip on the wall into the mortar down to the concrete. Coat the back side of the number plate 1 with the adhesive slurry and place the workpiece in the mortar bed, which connects the front edge exactly to the first wall mark "A".
Use the first horizontal wall mark to check that the entrance is at the correct height; if it is too high, you can knock it a little deeper with the rubber mallet; if it is too low, start the performance, increase the mortar bed and repeat the process.

Granite stairs
9. 2 The tolerance joints

Please take into account when installing the granite stairs that every natural stone stair covering is planned with a tolerance gap between the setting level and the appearance. On the one hand this helps to quickly correct minor installation errors in the heights, on the other hand it serves to compensate for the permissible thickness tolerances of natural stone according to DIN. The "pressing" of the natural stone covering, that is, jointless laying of the stairs is unfortunately a common mistake that leads to the fact that the whole staircase in the pitch heights no longer fits. Please pay attention to this joint as visible in the picture. This joint is subsequently closed with either mortar or silicone. The width of these joints results from the installation plan.

The trailing edge of the staircase touch never touches the concrete edge of the next step; This area will be used in the next step for mortising the second setting stage (kick kick), so do not worry - your level is not too narrow.
If the concrete staircases are not optimally concreted, these clearances can also be significantly greater - this is also what the staircase technician plans and is absolutely necessary to ensure that your stone staircase is safe after installation and that you do not experience any problems with the final building inspection.

Lay granite stairs
Lay granite stairs
Lay granite stairs

Granite stairs
10. Step - mounting the second stage

Coat the back of the second setting stage with adhesive slurry and position the setting stage on the step plate on the second wall mark "S"; Remember, as in the next steps, always on the edge insulation strips. Secure the second setting again with two sand-lime bricks or something similar.

Now fill both the area behind the second setting level and the second concrete level with mortar as already described.
Never forget to apply the low-viscosity trass cement sludge to the mortar before laying the slabs.

Once you have coated the back of the second appearance with adhesive slurry, place the work piece on the second wall mark "A" in the mortar bed and check the correct height on the second horizontal wall mark.
For the laying of the further steps you can safely fill the already laid steps; if there are minor displacements, you can correct them for several stages with the rubber mallet. After every third to fourth stage with the short spirit level, check that the steps do not have a counter slope. The laying of the coiled steps works in the same way.

Lay granite stairs

Granite stairs
Troubleshooting 1: A control stage is broken ....

A control stage is broken when unpacking or laying, or is completely missing.
Do you have to wait until the subsequent delivery with the installation?
No, not at all - the solution is very simple.
Place two of your sand-lime bricks on the concrete edge of the step as shown in the picture and underline them with a few boards to reach the height of the joint including the tolerance joint.
Place a piece of thin foil between the wood and the mortar to avoid contact between the two.
Now lay the following appearance plate as already described, so that the two sand-lime bricks support the appearance and can continue laying unhindered. As soon as the new setting stage has arrived, knock the two stones aside under the step plate and glue the setting step with natural stone middle bed adhesive. Since the setting level is a few millimeters lower than the distance from step to step, the subsequent insertion is no problem.

Lay granite stairs

Granite stairs
Troubleshooting 2: An appearance is broken ....

An appearance plate is broken when unpacking or laying, or missing completely.
Do you have to wait until the subsequent delivery with the installation?
No, not at all - the solution is very simple.
At the nearest hardware store, get one or more wooden boards that together have the height you need to reach the horizontal line of the wall marking. Lay the boards on the concrete step as shown in the picture.
Place a piece of thin foil on the back of the wood to prevent contact between mortar and wood.

Position the next step on the board and fill the area behind the step with mortar as described. Then you can lay the rest of the stairs unhindered. As soon as the substitute appearance has arrived, carefully knock the boards out from under the setting stage - do not worry if everything has been properly plastered - nothing will happen - and mortify the new access panel in the same place.

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