There is a crack in the concrete slab that water drips through when it rains. The top side is outdoors.
Received a suggestion from a concrete company to seal it with some epoxy system. But the quote was super expensive.
Is it some witchcraft? How do you do it?
Received a suggestion from a concrete company to seal it with some epoxy system. But the quote was super expensive.
Is it some witchcraft? How do you do it?
It should be epoxy or polyurethane that they have quoted. Is it really the crack that is the issue? Not some sealing layer? Is it in Sweden?
This is in Sweden. A Schönox waterproofing system (blue mat) was applied before the tiles. This was done 12 years ago. Unfortunately, the installers combed the adhesive across the slope, causing water to collect under the tiles and not be able to drain off.
I believe in this case, the tiles should be laid in an even mortar bed, without combing.
But now we have the crack.
I believe in this case, the tiles should be laid in an even mortar bed, without combing.
But now we have the crack.
The choice of the word witchcraft is fun... Injection into rock has historically been described as black magic by professors in geology/groundwater.
Epoxy and PUR require special protective equipment if handled seriously, which naturally drives up the price.
I have no personal experience with concrete repair. But it's never a hundred percent guaranteed to get the material in completely, regardless, fully covering a crack.
Perhaps consider a risk factor and compare it with the cost of laying a new waterproof layer?
Alternatively, it might be worth trying a DIY approach with foam sealant and holes drilled at an angle into the crack (pressure testing pump and cement is another variant, or a larger syringe and epoxy after taping the crack is a third).
Epoxy and PUR require special protective equipment if handled seriously, which naturally drives up the price.
I have no personal experience with concrete repair. But it's never a hundred percent guaranteed to get the material in completely, regardless, fully covering a crack.
Perhaps consider a risk factor and compare it with the cost of laying a new waterproof layer?
Alternatively, it might be worth trying a DIY approach with foam sealant and holes drilled at an angle into the crack (pressure testing pump and cement is another variant, or a larger syringe and epoxy after taping the crack is a third).
I have a hair-thin crack in a balcony, moisture seeps in during rain and snow. I was recommended this to seal it:
https://www.mapei.com/se/sv/produkt...oduktlista/produktbeskrivning/mapepoxy-bi-imp
Reading the datasheet, this or something similar might be what you need.
I haven't gotten around to it yet. Even if it says "for professional use," it should be possible to do it yourself with some thought.
https://www.mapei.com/se/sv/produkt...oduktlista/produktbeskrivning/mapepoxy-bi-imp
Reading the datasheet, this or something similar might be what you need.
I haven't gotten around to it yet. Even if it says "for professional use," it should be possible to do it yourself with some thought.
Thanks, that sounds good. The question is just how to best apply it so that the work won't be undone.F fallskydd said:
The data sheet mentions a lot under Application.
I don't know exactly what your conditions are, but I'm thinking:
* seal/tape underneath and on the sides
* mask off the sides of the crack
* apply a bead of epoxy over the crack, possibly using a syringe and needle
* let it sink in, refill
* repeat until it no longer sinks in
* scrape level with the surface.
It seems that it should absorb well into cracks down to 0.1mm
But as I said, I don't have experience myself yet...
I don't know exactly what your conditions are, but I'm thinking:
* seal/tape underneath and on the sides
* mask off the sides of the crack
* apply a bead of epoxy over the crack, possibly using a syringe and needle
* let it sink in, refill
* repeat until it no longer sinks in
* scrape level with the surface.
It seems that it should absorb well into cracks down to 0.1mm
But as I said, I don't have experience myself yet...