ᐅ Advantage of a DIN 18195-6 Waterproofing Standard!?

Hello,

I had a soil analysis (dynamic probing) carried out on our property. It showed that we have the typical regional calcium silicate stone (it used to be a vineyard).

In the original wording:
On the hillside side, the parts of the building in contact with the ground must be waterproofed against soil moisture and non-stagnant seepage water according to DIN 18195-4. It is recommended to drain seepage water that accumulates in the hillside working space with a U-shaped drainage or equivalent systems, which can safely infiltrate into the downhill (garden) terrain.

Now I have requested a quote for the basement accordingly... The first contractor got back to me, and the offer references DIN 18195-6 for rising seepage water? This would hardly be more expensive, but he would not implement it with these soil conditions. According to him, part 4 is only allowed if a drainage is installed; otherwise, he would have to backfill the working space with non-cohesive material.
Is this therefore something better that I am getting here and possibly worth the small extra cost, or is someone just reluctant to install a drainage system?

Thanks 😉

Hello,

first of all – don’t you have a construction manager or an expert with whom you can discuss these important questions in person?

Dipl-WiING schrieb:

Part 4 would only be permitted for drainage here; where the working space would have to be backfilled with non-cohesive material.

That is nonsense. DIN 18195-4 regulates structural waterproofing against ground moisture (capillary water, adhesive water) and non-pressing seepage water on ground slabs and walls, including the design and execution. This moisture exposure should only be considered if the building site consists of highly permeable soils (e.g., gravel or sand) to a sufficient depth below the foundation base and the backfill material in the working spaces is also highly permeable, or if there is drainage according to DIN 4095 in less permeable soils, the functionality of which is permanently ensured.

Dipl-WiING schrieb:

Is this therefore something rather better that I am being offered here and possibly worth the minor additional costs, or is someone just too lazy to install drainage?

We only install drainage systems when it is absolutely unavoidable; usually because a client is resistant to advice. With drainage, the client also brings neighboring water towards the house – which makes regular inspection and maintenance of the drainage more important than ever!

Therefore, I assume that the builder you asked about shares a similar approach 😉

Best regards, Bauexperte

Bauexperte schrieb:
Hello,

first of all – don’t you have a site manager or an expert you can discuss these important questions with in person?

Hello and thanks for the response! Yes, I do have one, and he is a civil engineer 😉 He recommends installing drainage, just like the certified geologist I paid a lot of money for the report does... But I thought if I can do without drainage by applying waterproofing to -6 meters (-20 feet), I would prefer to avoid it... and it looks like I will!

Thanks and best regards!