Get matched with top plaster repair specialists in Thermal, CA

Q: Is a sagging plaster ceiling dangerous?

• <div><p>The short answer is yes, a sagging plaster ceiling is dangerous. Sagging plaster on a wall is something you should fix immediately, but it isn&rsquo;t a major concern. If the same type of sagging occurs on a ceiling, however, you could be in danger of your ceiling falling in large chunks. When plaster sags, it loses its strength and ability to hold itself up. The bonds that hold it together are strong, though, so if a sagging area falls, it will take large pieces down with it. </p></div>

Q: How do I know if I have plaster walls?

• <div><p>If your home was built before the 1940s and was not remodeled in the past 50 or so years, you probably have plaster walls. Aside from assuming, there are some <a href="https://www.angi.com/articles/how-to-tell-drywall-vs-plaster.htm">practical ways to tell if you have plaster walls</a>, including the following: If you knock on the wall and it feels solid, not hollow, if you can&rsquo;t insert a thumbtack easily, if there are cracks that look like spiderwebs, or if your home has curved, arched, or swirled walls, doorways, or window openings.</p><p>If you have an unfinished basement or attic, you could examine the backs of any finished walls to check, too.</p></div>

Q: What maintenance is recommended after a wall repair?

• <div><p>Regular inspections and cleaning to prevent moisture or pest issues.</p></div>

Q: Does mirror adhesive ruin walls?

• <div><p>Depending on how much adhesive was used as well as the strength of the adhesive, you may have some drywall damage when removing a mirror. You can typically <a href="https://www.angi.com/articles/how-repair-drywall-damage.htm">repair most drywall damage</a> if it&rsquo;s small by sanding the damaged area, applying spackle to smooth the damaged section so it&rsquo;s flush with the rest of the wall, and repainting the area.</p></div>

Q: Can you use drywall repair techniques on plaster?

• <div><p>Yes, you can use drywall repair techniques for some types of plaster damage. Tiny holes and small cracks in plaster can be patched in similar ways to drywall. You apply the necessary compound to fill the hole, wait for it to dry, then sand it down. For larger damage, like water damage or mold, you need to use plaster-specific techniques and materials. </p></div>

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Verified Reviews for Plaster Repair pros in Thermal, CA

*The Angi rating for Plaster Repair companies in Thermal, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Plaster Repair needs.

*The HomeAdvisor rating for Plaster Repair companies in Thermal, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Plaster Repair needs.

Last update on December 05, 2025

Reviewed in December 2025
Joe install a new panel at my house , he completed the job as promised and everything went smooth and easy.
Meek Electric LLC
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Reviewed in July 2024
I would highly recommend this company took care of all my water damage and mold issues.
Executive 1 Demolition Restoration
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Reviewed in March 2023
I didn't receive any feed back to whether or not they are finished with this job order. They left behind alot of work material believing that this job is not fully complete! Thou,looking at the site,it looks like there's still more work to be completed! Overall,this co.pany really...
Platinum Roofing Company
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Reviewed in March 2022
Junior was very fast and professional. My carpets and couch look like new, would definitely hire him again.
LJA Cleaning Services
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Reviewed in November 2015
The knowledge of the crew was excellent. They have years of experience that leads to efficiency, saving time and money. The crew at SSP helped me repair my septic system with a truly proffessional performance of the job.
Sewer & Septic Pros, Inc.
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Reviewed in January 2013
Hill Electric did excellent work. Todd and his assistant were prompt, efficient and knowledgeable. Other contractors had told me significant work (including punching through my ceilings) would be required to remedy some of the problems. Hill Electric found all problems involved wiring or...
Hill Electric Inc
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Reviewed in April 2012
4000Jerry (the owner) of Summit Transmissions started things off with an invite to his shop to meet him and see his facilities. Once there, I was welcomed and shown why he is the best place to go to for vehicle transmission work. Not only does he have accreditation from the Better Business...
SUMMIT TRANSMISSIONS
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Find Plaster repair specialists in Thermal

PG Plastering

4.8(

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 2000

Free estimates

"Project: Repair and partially replace stucco surface of small retaining wall. Phil met with me and we discussed how to treat a short retaining wall that was losing the stucco surface after about 4 years since it was originally plastered. The wall was alowing water seepage to come thru the concrete block and lifting the original stucco finish off. Phil suggested a repair , consisting of first scraping all loose stucco off the wall and then applying an adhesive type undercoat followed by a total restucco of the wall. It was done very professionally , minimal debris, 2-day process , and it looks great. Now I just have to see how it holds up over the next 4-5 years . Highly recommend PG Plastering."

Response time2 hrs

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1995

"It was an excellent experience. The painters are always courteous, professional. They cleaned up after themselves."

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1990

Free estimates

Emergency services offered

"Excellent, detailed work on all projects with reasonable prices initially hired for plastering work was so good hired Tony to repair a roof , patio renovation, stair renovation. Referred to neighbors"

+86

Recommended by95%of homeowners

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Superior Plastering - Unlicensed Contractor

3.9(

)

Plaster - Repair

Serving Thermal, CA and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"They were able to come out in a timely manner and do some drywall repairs. When I noticed some needed touch up, they were willing to come back and make the area better. Like thier customer service."

Response time1 day

Response rate85%

Recommended by71%of homeowners

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Fredy’s Drywall Repair and Handyman Services

5.0(

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

Emergency services offered

"Very professional, i would use again"

+28

Recommended by100%of homeowners

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Just Do It Builders Inc

4.4(

215

)

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1991

Free estimates

Credit card accepted

"Just Do It arrived as scheduled and performed the work to my satisfaction. The drywall repairs were as promised and very professional.
"

+29

Recommended by70%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1986

Credit card accepted

"Very good work! I have used them before & will use them again!"

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 2004

Emergency services offered

"It went great! Every thing done right, professional and great quality. Wouldn't use anyone else. The work is guaranteed... No corners cut ... I have recommended to all Family and friends they are happy with the work as well...."

Recommended by100%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1994

Free estimates

Emergency services offered

"Matt came to inspect our roof and found another tile that needed to be replaced in addition to the 2 that were already broken. He came the next day to do the job. In addition to replacing the tiles, he fixed other tiles that were previously repaired by another company. He was efficient and did an awesome job. Reasonable price and would use him again for any future jobs."

Recommended by59%of homeowners

Plaster - InstallPlaster - Install - For BusinessPlaster - Repair+1 more

Serving Thermal, CA and surrounding areas

In business since 1981

Free estimates

"Excellent, the drywall even was perfect after the electrical work was completed for our garage
"

+16

Recommended by92%of homeowners

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Showing 1-10 of 61

Plaster Repair questions, answered by experts

The short answer is yes, a sagging plaster ceiling is dangerous. Sagging plaster on a wall is something you should fix immediately, but it isn’t a major concern. If the same type of sagging occurs on a ceiling, however, you could be in danger of your ceiling falling in large chunks. When plaster sags, it loses its strength and ability to hold itself up. The bonds that hold it together are strong, though, so if a sagging area falls, it will take large pieces down with it.

If your home was built before the 1940s and was not remodeled in the past 50 or so years, you probably have plaster walls. Aside from assuming, there are some practical ways to tell if you have plaster walls, including the following: If you knock on the wall and it feels solid, not hollow, if you can’t insert a thumbtack easily, if there are cracks that look like spiderwebs, or if your home has curved, arched, or swirled walls, doorways, or window openings.

If you have an unfinished basement or attic, you could examine the backs of any finished walls to check, too.

Regular inspections and cleaning to prevent moisture or pest issues.

Depending on how much adhesive was used as well as the strength of the adhesive, you may have some drywall damage when removing a mirror. You can typically repair most drywall damage if it’s small by sanding the damaged area, applying spackle to smooth the damaged section so it’s flush with the rest of the wall, and repainting the area.

Yes, you can use drywall repair techniques for some types of plaster damage. Tiny holes and small cracks in plaster can be patched in similar ways to drywall. You apply the necessary compound to fill the hole, wait for it to dry, then sand it down. For larger damage, like water damage or mold, you need to use plaster-specific techniques and materials.

The Thermal, CA homeowners’ guide to plaster repairs

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

Deirdre Sullivan
•
Jul 9, 2026Jul 9, 2026
How Much Does Plaster Repair Cost? [2026 Data]
Plaster repair costs are determined by the size and type of damage. Discover why some fixes you can DIY and why some require a pro’s help.
Mizuki Hisaka
•
Jul 31, 2026Jul 31, 2026
How Much Does Plastering Cost? [2026 Data]
The cost of plastering walls and ceilings depends on the room size and ceiling height. Our tips can help you estimate an accurate cost.
Stephanie Mickelson
•
Jul 10, 2026Jul 10, 2026
How Much Does It Cost to Apply Venetian Plaster? [2026 Data]
Venetian plaster can add depth and texture to your aesthetic. Learn how much Venetian plaster costs based on factors like square footage and whether you hire a pro to help.
Angi
•
May 21, 2026May 21, 2026
How to Hire a Plaster Repair Professional
Finding a qualified plaster repair pro? Learn how to hire the right specialist, what questions to ask, and what to expect for your project.
Katy Willis
•
Jul 20, 2026Jul 20, 2026
What Is Behind Your Lath and Plaster Walls?
You can find plaster walls in a lot of older homes. What’s behind these walls—whether that’s lath or calcimine—can have an impact on how long they last. Finding out the age of your house can help you determine what you’re dealing with.
Jamie Cattanach
•
Jul 9, 2026Jul 9, 2026
Who Does Plaster Work and What Is Their Job Like?
Who does plaster work? A plasterer, of course—one who’s gone through years of training to master this subtle construction art. Here’s what you need to know.