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#Drywall over lath and plaster how to
#Drywall over lath and plaster cracked
#Drywall over lath and plaster crack

You could always rip down the plaster and lath, and replace it with drywall. If you're feeling up to it, don't mind a huge mess, and have the money to burn. Once that is complete, the cracks can be repaired using a layer of Spackle. The product mentioned in the article, actually reattaches the plaster using glue. Once this occurs cracks will form, and will be nearly impossible to cover. Settling combined with the years of service the house has provided, may have caused some of the plaster and lath to become separated. In your case (old house), the house has likely already finished settling. I've never used this product before, however, the theory of how it works is sound. This Old House mentioned a product called Big Wally's Plaster Magic, in an article Plaster Repair Made Easier.

#Drywall over lath and plaster crack

So anything beyond a simple crack fix, I would go to a professional. Plaster is hard to work work with and requires a skilled laborer to apply. The final coat should be very light and then sanded, primed and painted. Apply 1 to 3 coats (it will shrink a little each time) and sand in between.

One the first coat is dry (it should also shrink a bit), switch over to the sandable Durabond.

Do not apply extra as it is non sandable.

Use a joint compound knife and work the mixture into the crack, removing any excess.

#Drywall over lath and plaster how to

Follow instructions on how to mix the Durabond. The nonsandable Durabond is stronger than the sandable durabound. Plaster is hard to work with so using Durabond will be easier. I would go for a first coat of non sandable Durabond. In your case, I would not use Plaster, but instead use Durabond.Wipe any dust with a damp rag to prepare the surface for the new Plaster of Paris or Durabond. Clean or vacuum any loose debris out of the crack.

Enlarge the crack by creating a V notch with the bottom of the V being the line of crack.

Remove loose or excess plaster in crack using a utility knife.

If the plaster and substrate is solid, then to fix the crack do the following.

#Drywall over lath and plaster cracked

I would advise doing these tests on all your cracks to determine the whether the plaster is just cracked or is suffering from bigger and more labor intensive issues. This is the case where the crack is hiding a larger issue of crumbling or decaying plaster and will need a larger scale fix. A simple crack may also turn into a large area where the plaster needs to be re-attached to the substrate. For example, one may need to replace the lath or substrate. If there is movement, additional repairs may be required beyond a simple crack fix. To fix cracks in plaster, use Plaster of Paris or Durabond, not spackling compound.Ĭracks are caused by moving or shifting, so one needs to make sure the existing plaster and corresponding substrate (in this case the lath) are solid.Ī simple test is on both sides of the crack in several locations gently push the plaster. Spackling's best use is to fill holes made by pictures, curtain holders, etc.