ᐅ Entrance platform with a single step made of natural stone
Created on: 14 Feb 2017 21:56
H
hausprofi
Hello,
I am currently planning to redesign the front garden (I have completely renovated the house and raised the level by about 10cm (4 inches)). For this, I first want to create an entrance platform made of natural stone (nero assoluto flame finish). Since the height from the garden path to the door threshold is 30cm (12 inches), I need a step with a 30cm (12 inches) tread that surrounds the platform in addition to the platform slab (85 x 140cm (33 x 55 inches)).
My plan is as follows:
1) Remove the tiles from the existing platform (which is significantly smaller and only 20cm (8 inches) high)
2) Excavate the soil for the platform extension to a depth of 20–30cm (8–12 inches) (the soil has been there since 1980, so I assume it is compact)
3) Fill in crushed stone and compact it (or do you think I need a frost-proof foundation here?)
4) Build formwork for the upper platform part and fill it with concrete mortar, then let it cure
5) Build formwork for the step and fill it with concrete mortar, then let it cure
6) Set the natural stone slab (85 x 140cm (33 x 55 inches)) on the upper platform part using a frost-resistant natural stone adhesive
7) Bond risers on the front and sides and finish the step as in step 6)
I hope this plan provides a good basis for discussion and I look forward to your responses. I am unsure whether the slab can simply be glued to the concrete in the same way as a windowsill.
I am currently planning to redesign the front garden (I have completely renovated the house and raised the level by about 10cm (4 inches)). For this, I first want to create an entrance platform made of natural stone (nero assoluto flame finish). Since the height from the garden path to the door threshold is 30cm (12 inches), I need a step with a 30cm (12 inches) tread that surrounds the platform in addition to the platform slab (85 x 140cm (33 x 55 inches)).
My plan is as follows:
1) Remove the tiles from the existing platform (which is significantly smaller and only 20cm (8 inches) high)
2) Excavate the soil for the platform extension to a depth of 20–30cm (8–12 inches) (the soil has been there since 1980, so I assume it is compact)
3) Fill in crushed stone and compact it (or do you think I need a frost-proof foundation here?)
4) Build formwork for the upper platform part and fill it with concrete mortar, then let it cure
5) Build formwork for the step and fill it with concrete mortar, then let it cure
6) Set the natural stone slab (85 x 140cm (33 x 55 inches)) on the upper platform part using a frost-resistant natural stone adhesive
7) Bond risers on the front and sides and finish the step as in step 6)
I hope this plan provides a good basis for discussion and I look forward to your responses. I am unsure whether the slab can simply be glued to the concrete in the same way as a windowsill.
H
hausprofi15 Feb 2017 22:34I am from the Cologne/Bonn area. The natural stone is from Zimbabwe, not Norway. The stonemason labor costs really add up as well...
H
hausprofi16 Feb 2017 12:12Cool – please upload a picture.
Yesterday, I saw a variation where the edges of the landing are set similarly to curbstones in hydraulic lime mortar. Then, the void is filled with gravel and aggregate, and the step tread and landing slab are placed on top. You could possibly apply a bit of hydraulic lime mortar on the aggregate layer in some spots. The question remains whether this will be stable. However, I would definitely recommend laying a strip foundation on the compacted gravel base for the edging stones to ensure they are level (or with a 1% slope).
Yesterday, I saw a variation where the edges of the landing are set similarly to curbstones in hydraulic lime mortar. Then, the void is filled with gravel and aggregate, and the step tread and landing slab are placed on top. You could possibly apply a bit of hydraulic lime mortar on the aggregate layer in some spots. The question remains whether this will be stable. However, I would definitely recommend laying a strip foundation on the compacted gravel base for the edging stones to ensure they are level (or with a 1% slope).
H
hausprofi16 Feb 2017 13:54Here is an example for illustration purposes...
For the side entrance door, we chose a more economical solution. My dad first poured a concrete base here as well, but instead of having an expensive granite slab custom made, we bought two granite patio slabs from a home improvement store that are almost the same color as the large granite slab at the front door. For the risers, we simply used granite lawn edging stones.
The total cost of materials was under 30€ and it still looks quite good and serves its purpose well.
The total cost of materials was under 30€ and it still looks quite good and serves its purpose well.