Ask Builders
Add question
  • Questions
  • Tags
  • Builders
  • Help

Is a terrace with natural stone slabs on a concrete foundation possible?

Asked 1 year ago.
Active 11 months ago.
Viewed 629 times.
  • natural stone
  • terrace
3

We would like to have a terrace with natural stone slabs, and we currently have the following construction (13 years old):

Compacted recycling. Concrete slab 18 cm. Sloped screed (only 1% slope!) with reinforcement and sealing film under the screed. Laminated porcelain stoneware. Aluminum extrusions on the edges. The aluminum profiles are now loose, and some of the edge tiles are also loose and/or broken.

We now want to build a patio with natural stone tiles, and we have the following idea:

Remove the stoneware tiles. Grind the sloped screed down to a 2-3% slope. Laying sheets with dimples (dimples up, overlapping, like shingles) >= 3 cm of basalt rubble on top and sand to 2% slope. Place unbound slabs on crushed stone. Install curbs.

Now our questions:

Is it possible to lay natural stone slabs on crushed stone on a concrete slab in this manner? If not, how else is it possible? Is it necessary/necessary to use a drainage fleece? If so, is it directly on the bubble wrap or directly under the slabs? As for laying on gravel: can it stay constantly wet under the slabs (even with a slope) due to drips remaining and would that be a problem?

P.S.: Overall construction height is not an issue for us.

asked 1 year ago
Author avatar
491mixTaPe
Author avatar

Answer

2

Possibly without a drainage fleece. It is important to have at least a 6 cm layer of sand. And very important: use a grit of 5-8.

Otherwise you will get the famous wet spots on the natural stone. If you don't know what that is, just google it.

Most people use 2/5 or 0/5 grit, but they don't destroy capillaries. No problem with concrete slabs, but with natural stone you will get wet spots.

answered 11 months ago
Author avatar
260Magali J
Author avatar
Answer this question

Related

  • Which natural stone slabs are less susceptible to moss/fading?
  • What are the features of a terrace paved with natural stone (e.g. porphyry)?
  • How to lay tiles on rubble on a terrace?
  • How to make the terrace higher by 15 cm? Use piles?
  • What are the disadvantages of covered attached terrace?
  • What to fill the 2 meter deep spaces under the new terrace with?
  • What are the disadvantages of quarry slabs of mottled shale?
Log in Join
Privacy Policy・Terms of Service