Trying to save an old concrete veranda that was cast in the 1930s. The concrete veranda stands on 3 cast pillars about 1:50m high in a basement, so it's possible to access the veranda from underneath. On the top side, there are significant cracks, and on the underside, some chunks have come loose so you can see directly into the rusty reinforcing bars. There are 2 versions of what is the best measure for this operation.
1: Paint the top side with a paint that seals the concrete, like Drylok, so the concrete can't "breathe" upwards, only downwards.
2: Paint with a 2-component paint that is water-repellent and allows the concrete to "breathe" upwards as well. In this case, you can also pre-treat the concrete by applying a silane-based sealant before painting, like "water glass".
Anyone here who has renovated or has tips on this, attaching links to 3 different products on this topic.
http://www.sika.se/view/files/90/Sikadur-31+PB.PDF
http://www.sika.se/view/files/149/Sikafloor-2530W+PB.PDF
http://www.mpdiy.com/Produkter/produkt_visa.asp?produkt_id=18&show=produkter
1: Paint the top side with a paint that seals the concrete, like Drylok, so the concrete can't "breathe" upwards, only downwards.
2: Paint with a 2-component paint that is water-repellent and allows the concrete to "breathe" upwards as well. In this case, you can also pre-treat the concrete by applying a silane-based sealant before painting, like "water glass".
Anyone here who has renovated or has tips on this, attaching links to 3 different products on this topic.
http://www.sika.se/view/files/90/Sikadur-31+PB.PDF
http://www.sika.se/view/files/149/Sikafloor-2530W+PB.PDF
http://www.mpdiy.com/Produkter/produkt_visa.asp?produkt_id=18&show=produkter
Hello!
We have a concrete entrance staircase with a basement underneath. It has some moisture damage. Our inspector said all the moisture damage came from above. It has leaked down into the holes where the staircase railing is attached, among other places. He also said that there's no danger with it if we seal the top of the staircase properly. So his recommendation seemed to be to seal the top and only let it breathe downwards. (We haven't done anything about it yet.)
/pinebar
We have a concrete entrance staircase with a basement underneath. It has some moisture damage. Our inspector said all the moisture damage came from above. It has leaked down into the holes where the staircase railing is attached, among other places. He also said that there's no danger with it if we seal the top of the staircase properly. So his recommendation seemed to be to seal the top and only let it breathe downwards. (We haven't done anything about it yet.)
/pinebar