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All plaster walls will crack over time due to normal house settling and expansion and contraction from temperature and moisture changes. Small, thin hairline cracks are generally not serious and are mostly a cosmetic issue. However, larger or more significant cracks can indicate structural problems.

Here's how to tell the difference:

• Cosmetic Cracks: Cracks that are 0.5 cm (0.2 inches) or thinner are typically cosmetic.

• Structural Cracks: Cracks wider than 0.5 cm, excessive or deep cracks, multiple cracks in the same area, or cracks that span around corners can signify a structural or foundation issue. Cracks along the joints where walls meet the ceiling also warrant attention.

For cracks wider than 0.5 cm, structural repair is needed. If a crack is 2.5 cm (1 inch) or wider, or if you notice any signs of a structural problem, it is best to contact a plaster repair professional to assess the damage.

If you’re looking for a reliable plaster repair company, you should start by researching local companies in your area and reviewing their status with the Better Business Bureau. Next, you can contact the potential companies to ask about experience levels, get a list of references, and ask for examples of past work. If you have a textured wall, consider asking if they have examples or references for that particular texture. This method should help you narrow your search even further. You may also want to ask each company if they provide a warranty for their work.

Drywall tape is made of paper, while drywall mesh is made of fiberglass or metal. Drywall mesh patches are suitable for repairing small holes in drywall, while paper drywall tape holds a crease better for corners. You need joint compound to adhere drywall tape to the wall, while mesh patches may be self-adhesive.

Plaster is denser, harder, and more porous than drywall, so it absorbs moisture differently. This means you’ll often need more prep work, such as thorough sanding, patching, and priming with a high-quality bonding primer. Additionally, you may need more coats of paint to achieve even coverage. While the process takes more time, it helps ensure a durable and professional-looking result.