Cracked plaster in an older house: repair what is there or tear it out for drywall

In most cases, repair the plaster

If your plaster walls have cracks, small holes or a few loose areas but are mostly still tight to the wall, repairing them is usually the better choice. Repair is faster, much less messy and keeps the solid, quiet feel that plaster gives a room. Replacing plaster with drywall makes more sense when large areas are loose and failing, when the walls are being opened anyway for wiring, plumbing or a remodel, or when water has destroyed a section. Before anyone sands or demolishes old plaster, find out whether lead paint or asbestos could be involved.

We repair plaster walls and ceilings as well as drywall at PatchMaster, and I get this question from owners of older homes who have been told by someone that the only answer is to rip everything out. Sometimes that is true. Often it is not. Here is how I think it through.

What makes plaster different from drywall

Drywall arrives as finished sheets screwed to the framing, with only the seams taped and coated. Plaster is built up in place, usually in layers over a base of wood or metal lath, and it cures into a hard, dense surface. Where it pushed through the gaps in the lath, it formed keys that lock the plaster onto the wall. As long as those keys hold, the wall is remarkably durable.

That density is why plaster rooms feel solid and quiet, and why many owners of older homes want to keep it. It is also why plaster behaves differently when it fails. Instead of a soft dent, you get cracks, and sometimes sections that have come loose from the lath behind them and bulge or sound hollow when you tap them. Repairing plaster is its own skill, and it is worth asking any company whether they work with plaster or only with drywall.

Reading the condition of your walls

Walk the room with good side light and knuckles. Tap lightly across the surface, especially near cracks and on ceilings. A solid sound means the plaster is still attached. A hollow or rattling sound means it has separated from the lath in that spot. Press gently on any bulge: if it moves, it is loose. Note where the cracks are and whether they are fine lines in the surface or wider gaps with edges at different heights.

Ceilings deserve the closest look. Gravity works against loose plaster overhead, and a ceiling section that has lost its keys can drop without much warning. If a ceiling bulges or you hear crumbling inside it, keep the room clear underneath and have it assessed soon rather than waiting for the rest of the repair list.

• Fine cracks in a firm wall: classic candidates for repair
• Small holes and old anchor damage: repairable with the right materials and finishing
• A few loose or bulging spots: usually repairable by securing or replacing just those sections
• Large areas that sound hollow or sag, especially on ceilings: replacement of those areas is often wiser
• Plaster crumbling from long-term water exposure: that section needs to come out once the leak is fixed

When repair is the right call

Most plaster damage I see falls into the first three categories. Settlement cracks around doors and windows, an old patch that has cracked at its edges, holes where hardware used to hang and a few loose spots near a ceiling corner are all things a skilled repair handles without tearing out the wall. The work involves opening cracks enough to fill them properly, securing or cutting back loose material to sound plaster, building new material up to the thickness of the existing wall, then finishing, texturing and painting to match.

Repair also keeps the trim, door casings and window details in their original relationship to the wall. Drywall is generally thinner than a full plaster wall, and when plaster is replaced, trim and electrical boxes often need adjusting so everything sits flush again. That hidden work is one reason a tear-out costs more than people expect.

If cracks in your house keep reopening, though, the plaster is only the messenger. My guide on why cracks keep coming back explains how movement in the structure shows up on walls, and why the cause may need attention before the surface does.

When replacing with drywall makes more sense

There are real reasons to replace plaster. If large areas have lost their grip on the lath, repairing spot after spot can cost more than new board, and the next section may let go next year. If an electrician is rewiring the house or a plumber is rerouting supply lines, the walls are already being opened, and replacing a damaged wall at the same time can be the efficient choice. And if a leak has soaked a section until it crumbles, that part has to come out either way.

Replacement does not have to mean the whole house. Very often the right answer is mixed: repair the walls that are sound, and replace only a ceiling or one badly damaged wall. The goal is the least disruptive repair that will last. A sound plaster wall in the living room does not become a worse wall because the bathroom ceiling next door had a leak, and it should not be priced into a tear-out just for consistency.

Lead and asbestos: check before anyone sands

Older plaster walls have usually been painted many times, and the oldest layers may contain lead. The EPA's Renovation, Repair and Painting Program applies to anyone paid to perform work that disturbs painted surfaces in homes built before 1978, and it requires those firms to be certified and follow lead-safe work practices. Homeowners working on their own homes are generally not covered by the rule, but the EPA still advises lead-safe practices.

Some older building materials also contain asbestos. The EPA says you generally cannot tell whether a material contains it just by looking unless it is labeled, that you should not saw, sand, scrape or drill into suspect material, and that a trained professional should take any samples. A full tear-out disturbs far more material than a targeted repair, which is one more reason repair is often the safer path. If you do not know what your walls contain, have them checked before demolition starts.

How the two choices compare

Laid side by side, the trade-offs are fairly clear. Neither option is right for every house, but for a plaster wall that is mostly sound, repair usually wins.

• Disruption: repair is confined to the damaged areas; a tear-out empties the room and fills it with debris
• Dust: repair can be controlled with barriers and HEPA-filtered tools; demolition creates far more
• Trim and boxes: repair leaves them as they are; replacement often means adjusting them
• Feel: repair keeps the density and sound control of plaster; drywall is lighter
• Long-term: repair suits walls that are mostly attached; replacement suits walls that are failing broadly

Questions to ask before you agree to a tear-out

If someone has recommended removing all of your plaster, it is reasonable to ask them to explain why. A good contractor will walk you through which walls are failing and which are sound, rather than treating the whole house as one decision. These questions help you get a clear answer.

Get the answers in writing, alongside a repair estimate for comparison. Seeing both options priced for the same rooms is the quickest way to know whether replacement is a recommendation or a habit.

• Which specific walls or ceilings are loose, and how did you determine that
• Could the sound areas be repaired while only the failing sections are replaced
• How will trim, door casings and electrical boxes be handled if the wall gets thinner
• How will dust be contained, and how will lead and asbestos questions be answered before demolition
• How many days will the room be unusable, including drying and painting

Matching texture and paint on old plaster

Older walls rarely have the sprayed orange peel or knockdown of newer houses. They may be smooth, slightly wavy from hand troweling, or carry a hand-applied texture that someone created decades ago. Matching that takes a different approach from spraying a texture, and the repair needs to follow the slight irregularity of the wall rather than create a perfectly flat island that looks out of place.

We match existing texture and paint as closely as possible, and on walls with many layers of old paint, repainting the full wall corner to corner is often the cleanest way to make the color uniform. My guide on myths about matching texture and paint goes deeper on why a correct color can still look wrong over a fresh repair.

Getting a plaster repair assessed

Start by sending photos through our online form: one wide shot a few feet back from each damaged area and a close-up in side light so the surface shows. Mention when the house was built if you know, and whether any spots sound hollow. Estimates are free, and after an initial assessment you receive a detailed estimate of all costs. If you want to understand the factors behind that number, see what drives the cost of a repair.

On the day, the technician sets up dust barriers and drop cloths, works with HEPA-filtered equipment and cleans up afterward. Plaster repairs often need more than one visit because of drying time between coats, and this guide to how long a repair takes explains why. We repair plaster in homes from downtown Dallas north to Plano and east to Royce City.

Questions people ask me