Foundation selection for terrace

  • Erstellt am 2015-05-04 07:20:59

Papilaus

2015-05-04 07:20:59
  • #1
Hello dear Bau-Forum community,

we, my wife and I, have an end-terrace house on the side of which facing the garden we want to build a wooden terrace, we have a side exit and this is just perfect for it.

But we have a big problem, in the area beneath the planned terrace there are utility lines (electricity + water) at a depth of 80 cm. Our soil is former arable land (clay and loam mixture) which is heavily compacted and contains a high amount of stones, from pebbles up to a still manageable block.

What kind of foundation should we plan for it, we have read everything about it, from directly on the ground, driven ground sleeves, gravel foundation at only 40 cm up to full 80 cm as point or strip foundation, because nothing else is frost-proof, but there the lines might be in the way!

My last thought on that was 40 cm - 60 cm and placing the whole thing on screwable spacers, then I could possibly just compensate for frost-shifted unevenness again.

But what is sensible and safest in our situation? Are there any experiences on this?

My uncertainty is great and once it’s done there is no going back without consequential costs!

What can I and should I do?
 

toxicmolotof

2015-05-04 07:48:58
  • #2
Food for thought: Do you really believe that once the terrace is planked, you would actually remove it completely again after frost damage to level it anew? I don't think so.

If it is to be done properly, you cannot avoid a frost-free foundation.
 

Papilaus

2015-05-04 08:33:38
  • #3
I would like to do that, but the supply lines lie at frost protection depth. How high would the risk of frost damage be if we lay thick lawn edging stones or something similar around the foundation? Would it be minimized by doing so?

So far we have dug about 40 cm, the result is now in front of me and I am wondering what the best further procedure is. So far I haven’t really found any help on the internet. Sure, the extensive neighbors of the development project, who also decided on a wooden terrace, were all able to do it at 80 cm, but they don’t have stupid supply lines.
Would, for example, 60 cm of finely crushed gravel compacted with lawn edging stones around it be enough?

An additional question would be: The soil is strongly compacted, should it be loosened or left compacted?
 

Bauexperte

2015-05-04 14:20:29
  • #4

If the intended terrace encroaches on the clearance area, it is questionable whether you are allowed to build it at all.

If this is not the case, a simple gravel bed is sufficient; no spot or strip foundations.

Rhine regards
 

nordanney

2015-05-05 10:53:01
  • #5
This is how we built our terrace. About 30-40cm of compacted gravel and then on mortar bags or stones. This is already the second terrace in the last 10 years. No point, strip, or other foundations. Finished, it looks like this:
 

Doc.Schnaggls

2015-05-05 15:25:26
  • #6
Is it a good idea to build over the supply lines, regardless of the type of foundation + terrace?
 

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