ᐅ Footing - how waterproof is it? Has anyone had experience with this?

Will the base joint withstand standing water after heavy rain?

Due to the location of our house, it is possible that the base joint (construction joint between the structural slab and the floor buildup) will be underwater for about 2 hours during extreme rain (maybe once every 5 years) with water reaching approximately 7 cm (3 inches) above the joint. The water level cannot rise higher because it will then drain over the street crown. Unfortunately, we are not allowed to raise the house.

Therefore, our questions:

1. Will this construction joint hold up against this standing water (about 7 cm (3 inches) above the joint for approximately 2-3 hours)?

2. And what about the waterproofing of the floor-to-ceiling doors/windows, will they also withstand this?

Our house is a standard model from Town & Country, without a basement and simply plastered on the outside, with mineral-based waterproof slurry at the base area.

Thank you very much for your help!!

From personal experience, a front door can only hold back pooled water for a limited time; eventually, the water will find its way through the door into the interior of the house.

munger71 schrieb:
From my own experience, a front door can only hold back standing water to a limited extent; eventually, the water finds its way through the door into the interior of the house.

Do you mean the threshold of the door, where it meets the raw concrete floor slab? (About 16 cm (6 inches) below the finished floor height)

Water cannot rise above the finished floor level in our case. However, the question is how long this threshold sealing will hold before water penetrates between the raw concrete slab and the floor build-up (insulation, screed, etc.).

Can anyone offer advice?

I don’t know. But shouldn’t it be done professionally so that you don’t lay paving directly against the house, but instead install a gravel strip with drainage underneath, so the water doesn’t rise but is drained away? Like this.

Depending on the construction method, this can work. However, the structure must have been sealed against permanently pressing, trapped water during construction. In the simplest case, only the lowest risk level, "ground moisture," is considered.

You need to review the original planning documents. Anything else can only be determined with a functioning crystal ball.

Domski schrieb:
In the simplest case, only the load case "ground moisture" is considered.

If the sealing was done only against 'ground moisture,' would the seal fail immediately and not at least hold back standing water for about an hour or so? The water head above the joint would be only about 7 cm (3 inches).