We repaired the plaster detachment on the basement wall with Finja Laga inne. Now there are hairline cracks in the repair, see the picture at the bottom.
What is the cause of this? Too thick a layer (1-1.5 cm)? Drying too quickly? Or was it the wrong product for the purpose? We asked in the store, but that guy scratched his head more than we did, so he had no clue. We have more plaster detachments to repair, so it would be good to know what we should do differently next time.
Do we need to do anything about the cracks? They might not be visible once we've painted, and there will be a shelf in front, so it's not very important how it looks.
It is easy for it to dry too quickly and not have enough time to properly cure. This can manifest as cracks and it may result in poor adhesion to the substrate. To avoid this, pre-wet the substrate so that it does not absorb water from the new mix, and ensure it stays moist until it has cured. A common tip I've seen is to post-water for three days.
It is easy for it to dry too quickly, and then it might not have hardened properly. This can show up as cracks and it might lead to poor adhesion to the substrate. To avoid this, the substrate is pre-wetted so it doesn't absorb water from the new mortar, and you should ensure it stays moist until it has hardened. A common tip I've seen is to keep watering it for three days afterward.
Thanks! We watered the wall, but maybe we should have covered the mortar afterward so it wouldn't dry so fast. It had dried and cracked by the next day, so it was too late to water more then. It's pretty cool and the air is dry in that room (pantry) this time of year.
We hope it holds. In the worst case, we'll have to redo it in a few years. We haven't redone our drainage yet, so there's still a risk for new plaster detachment.
After painting, only the largest crack is visible and nothing sounds hollow (yet). Now we hope it lasts at least as long as the rest of the old plaster
(The surface is intentionally rough and uneven in an attempt to match the old surface around it)
Click here to reply
Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.
Johhhan said:
