Repairing Cracked Stucco

Questions, answers and advice for people who own or work on houses built during the 20th century.

Moderators: oldhouse, TinaB, Don M, Schag

Michellewalty66
Posts: 2
Joined: Wed Aug 29, 2018 5:36 am

Re: Repairing Cracked Stucco

Post by Michellewalty66 »

Dave7711 wrote:The Cape Cod I bought last year came with a chip of the stucco around the concrete base. I am enclosing a photo of this chip. This is mainly a cosmetic repair but I still definitely want it done. I check with a hardware store and showed them the photo and they said it was a bear to fix the chip myself. They suggest getting a contractor to do the repair.

I would like to try repairing this chip myselfto save on money but have never worked with concrete or stucco. Can a novice like me just buy a 50 pound sack of concrete or stucco not sure which, mix it with water, and spread it on there to fill it? Or does this require a "professional".
Hi, I'm not sure...so better ask an opinion with a professional before doing anything.

Michellewalty66
Posts: 2
Joined: Wed Aug 29, 2018 5:36 am

Re: Repairing Cracked Stucco

Post by Michellewalty66 »

Hi, I'm not sure..so I think it's better to take an opinion with the professional.

windowdoorguy
Posts: 1
Joined: Tue Nov 13, 2018 8:23 pm
Contact:

Re: Repairing Cracked Stucco

Post by windowdoorguy »

You'll never match the existing stucco, so you will need to chip off and remove the rest of the stucco on that wall. Use a putty knife or something similar to chisel it off and just keep going. Dont forget you don't know why the stucco was put it - it may have been to cover up cracked or damaged brick. Remove as much as you can with a wire brush to get off the small crumbly stuff.

Then start the process:

Cleaning
Start the process by cleaning the brick wall prior to the stucco application. For this you should either use a pressure washer, or scrub the brick. Make sure you give a thorough cleaning in order to remove the dirt and any crumbling mortar. This will leave it ready for the bonding agent and ensure it’s going onto a fully clean surface for the best adhesion. Allow the brickwork to dry before moving on.

Bonding Agent
You can’t put the stucco directly on to the brickwork. There needs to be something between it and the bricks to hold it on firmly. For this you’ll have to use a concrete bonding agent. Put it on the surface with a paintbrush but be careful to ensure you cover the entire brick wall to guarantee good adhesion for the stucco application. There’s no need to put on a very thick coat; all you’re doing with it is putting on a surface, not an entire layer of material. Give it an hour to dry fully.

Scratch Coat
Once the concrete bonding agent has dried, the next step in the stucco application is the first coast of stucco, which is known as the scratch coat. Start by making up the stucco mix in a wheelbarrow. This will let you move it easily as you progress on the wall. Follow the manufacturer’s instructions and stir thoroughly so all the lumps dissolve.

For the stucco application of a scratch coat, put the mix onto the bonding agent with the trowel. They layer should be approximately ¼ inch thick. It doesn’t need to be absolutely even; this is one of the advantages of stucco. Leave it for about an hour to partially dry. After this run the plasterer’s rake through the mix to a depth of about 1/8 inch. After this you need to give the scratch coat time to dry. Allow about 48 hours, but mist it periodically with water for some dampness. If the weather is especially hot or dry, you should mist more often.

Final Coat
Once the scratch coat has dried it’s time to apply the final coat in the stucco application. Once again you’ll need to make up the stucco mix according to the instructions. Use a finish trowel to apply the stucco on top of the scratch coat. Once again the coat of stucco should be about ¼ inch thick. You can create texture for the stucco application by regularly changing the angle and pressure of the stucco application. Leave the stucco to cure for several days. If you intend to paint it, wait six weeks before painting.

Good luck!
My work as a General Contractor is my passion http://www.windowdooroutletny.com

Post Reply