I have a few very fine vertical cracks that have opened up in my plastered walls along the (insulated) plasterboard seams. I know that these joints were meshed, and that the plaster dried slowly and did not crack or craze with age. They resulted from specific trauma
> In one case, the crack opened due to a minor structural shift during installation of a RSJ over a year ago and the crack has not expanded.
> In another case, the crack appeared after mist coating a few weeks ago and probably was a reaction to extra water being pulled into the deep fill joint at the board junction.
I understand from researching in the forum that the usual advice is to enlarge the crack by cutting out a "V", filling (red devil, easy fill, or whatever, sand, prime) and continue on.
However, I am wondering if there is anything different to consider given the specific location of these cracks? For instance ... Should I really be digging away at the mesh? That area is filled with plaster which is harder that the plasterboard to either side, does that matter?
Before moving on with the rest of the decorating, I am going to be overcoating these walls with Zinsser Gardz. This new sealing coat might bridge the crack anyway. However, even if I knew that was going to sort the problem out all on its own, I really would like to know what are some of the recommended strategies to approach this sort of a problem if I wasn't overcoating with a sealer.
Thanks!
> In one case, the crack opened due to a minor structural shift during installation of a RSJ over a year ago and the crack has not expanded.
> In another case, the crack appeared after mist coating a few weeks ago and probably was a reaction to extra water being pulled into the deep fill joint at the board junction.
I understand from researching in the forum that the usual advice is to enlarge the crack by cutting out a "V", filling (red devil, easy fill, or whatever, sand, prime) and continue on.
However, I am wondering if there is anything different to consider given the specific location of these cracks? For instance ... Should I really be digging away at the mesh? That area is filled with plaster which is harder that the plasterboard to either side, does that matter?
Before moving on with the rest of the decorating, I am going to be overcoating these walls with Zinsser Gardz. This new sealing coat might bridge the crack anyway. However, even if I knew that was going to sort the problem out all on its own, I really would like to know what are some of the recommended strategies to approach this sort of a problem if I wasn't overcoating with a sealer.
Thanks!