ᐅ Material for sealing joints (to prevent water ingress from below)

Hello, I have slate slabs installed above the basement door, which is located about 1.5m (5 feet) below ground level. Some of the joints are slightly porous and cracked, allowing water to seep through from the soil when walking over them. Is there a solution to waterproof these joints (waterproof joint mortar? Acrylic sealant, etc. There are so many products on the market) or is it generally difficult when water is pushing upward from below? Thanks for your assessments. Best regards, ashley

The "correct" approach would be to remove the slate tiles and properly install a waterproofing layer against hydrostatic pressure. After that, you can install whatever you want in any way you prefer.

For example, you could use Sopro ZR Turbo XXL, a two-component cementitious waterproofing suitable against hydrostatic pressure. You can then also use tile adhesive on top of it. (This would not be possible with bitumen-based waterproofing products.)

HarvSpec schrieb:

The correct approach would be to remove the slate tiles and properly install a waterproofing layer against hydrostatic pressure. After that, you can install whatever and however you want.
A suitable material would be, for example, Sopro ZR Turbo XXL, a two-component cementitious waterproofing also effective against hydrostatic pressure. Over this, you can then use tile adhesive. (This would not be the case with bitumen-based waterproofing.)

Thank you for the assessment. I will definitely address this in the (near) future. However, currently the water ingress is not very severe, and I thought I could initially seal the few affected areas with a quick temporary fix (before later following your idea of installing a new waterproofing layer). Is there a product for a quick initial solution?