ᐅ Foundation or masonry: Both horizontal and vertical damp-proof course?

Hello,

Our house will have two floors and no basement.
I had assumed that a foundation would be built (with drainage), with the walls placed on top, and that the house would be constructed step by step in this way.

Now, a friend pointed out to us that a horizontal damp-proof course needs to be installed above the foundation to prevent moisture. Our builder confirmed this as well.

However, our friend said that this damp-proof course should also be turned up around the outside and serve as a vertical damp-proof barrier along the outer edge to prevent moisture from penetrating from outside.

Our builder disagreed, saying that sealing the foundation externally like this can trap water under the slab inside, which then cannot escape to the outside.

So my question is:
A horizontal damp-proof course is a must—okay. But what about the vertical damp-proof barrier? Who is correct, and what is the better approach?

I appreciate any tips or advice.
Best regards,
Tim

TimB schrieb:


Our builder denied this, saying that sealing the base/the foundation from the outside would allow water to accumulate underneath the slab inside, which then cannot drain outwards.
Tim

That’s really funny

You need both horizontal and vertical waterproofing.
What does your architect say about this?

Hello,

I haven’t spoken with him yet; I wanted to gather some information first, as you can find two different opinions online. Many say that if you don’t have a basement and are building only on a slab foundation, the external vertical damp proof membrane is not necessary?!

Best regards,
Tim

Hello,
somehow you have to protect your building at the base from moisture. The best way to do this is with a suitable waterproofing.

Detailed planning is not included.