Updated at: 07-09-2022 - By: cnbusinessnews

It is recommended to clean concrete masonry unit walls that have been damaged by water by using a mixture of soap and water. A bristle brush is the best tool for removing stubborn wall stains. A lot of individuals prefer concrete masonry walls, thus this tip is useful in wet environments.

Why Should You Choose Concrete Masonry Walls?

A variety of cements and aggregates are used to create concrete masonry unit walls. Because of its low cost and high durability, it is widely used in building projects.

  • This material is not readily dented, making it a great option for exterior walls.
  • Savings in money – To save money, use concrete masonry because it is long-lasting and requires less fixes. It can withstand fire, hurricanes, and burglars without much damage, saving you money on insurance premiums.
  • Fireproof and soundproof, concrete masonry walls are impervious to flames and smoke. In the event of an accident, much less damage will be sustained by your structure.

Because of its rigidity, this material can also serve to muffle exterior noise. Living in a concrete and masonry structure will provide you with greater tranquility.

  • This wall is well insulated and will keep the interior at a pleasant temperature regardless of the weather outside.
  • Because it doesn’t give off any VOCs, the air around concrete masonry construction sites stays cleaner.

Types Of Water Damage On Concrete Walls

Masonry concrete is strong, yet it can be damaged by water in some ways. Wall damage from water, leaks, or flooding should be addressed.

Water-Damaged Concrete Block Walls | Hunker

Seepage and condensation

Water seepage occurs when liquid penetrates a wall from the outside, whereas condensation forms on the inside of a wall when the air is humid.

These issues can be brought on by leaks or a generally wet environment, both of which need to be addressed immediately to prevent the spread of mold.


If you have a concrete wall, have you ever noticed a scaly white film on it? What you see is efflorescence, which is the accumulation of salts on the wall surface caused by the evaporation of water. Because they are typically dark, wet, and chilly, basements often have this issue.

Surface and structural damage

Water damage to a building’s exterior can result in paint flaking and peeling. As a result of moisture, mortar joints can break and blocks might shift, causing structural damage.

. Knowing how to spot the telltale indications of water damage is crucial for treating it effectively. Don’t hesitate to call in the experts if the damage seems too great to handle.

Step-By-Step Process On How To Clean Water Damaged Concrete Masonry Unit Walls

You probably know what efflorescence is if your building has a basement. A simple and inexpensive solution is available for dealing with these stains, which can be a persistent issue.

Step #1. Prepare your materials

Warm water, a sponge, liquid dish soap, a bristle brush, a clean rag, goggles, and an electric fan are all you need to get the job done. An ordinary paintbrush can be substituted for a bristle brush in a pinch.

Step #2. Make the soap mixture

Put five gallons of hot water in a bucket and add a few drops of liquid dish soap to get the job done. Use the brush to combine the liquid.

Step #3. Scrub the wall

Use the brush that you dipped in the cleaner to scrub the wall. Efflorescence should be cleaned up as thoroughly as possible. After cleaning a sizable area, you will need to refill the bucket because the water will become contaminated by the stains.

Step #4. Rinse the wall

When you’ve finished scrubbing the wall and the spots are gone, give it a final rinse with clean water. Use a damp towel to wipe off the wall.

Step #5. Dry the wall with fans

This step is crucial in the cleaning procedure. Don’t put it off too long though, as the wall may start to absorb water again.

Leave the fan facing the wall to dry. Exterior walls don’t need to be cleaned any differently than inside ones; just leave them out in the light and fresh air.

All that mess on your wall has been fixed! Constantly re-evaluate whether or not the efflorescence is sprouting so that you can continue the process.

Will Insurance Cover The Water Damage Costs?

Water damage to a concrete masonry wall can take many forms, and some are more difficult to repair than efflorescence. There will be times when you have to spend a lot of money on repairs, particularly in the basement.

Does your homeowner’s insurance cover these costs? Every insurance plan is different, so it’s important to check with your service provider to learn the specifics of your coverage.

You can breathe a sigh of relief because your insurance should cover any leaks that occur on the inside of your basement. To work with your insurance company, you’ll need to pinpoint where the water entered your home.

Common examples of covered losses from within a home include:

  • Faulty home electronics
  • Piping failures
  • Broken water heater
  • The toilet or bathtub is overflowing.

If the information comes from somewhere else, further caution is required. Even in the event of a flood, most insurance policies would not pay for repairs caused by water coming from outside sources.

The following are examples of things that are not covered by homeowner’s insurance:

  • Overflowing sewage
  • Disruption caused by flooding
  • Deterioration of the subterranean water table

Flood insurance is something that needs to be purchased separately and thoroughly researched. Keep in mind that each insurance provider may offer slightly different coverage and benefits. If you are having trouble conveying with your representative, you should seek legal counsel.


7 Simple Steps to Waterproofing Exterior Walls

  1. Walls should be inspected for damage; waterproofing is recommended if rainwater or moisture has caused dampness in the walls. It is recommended that all potential sources of structural moisture be ruled out before beginning the search for waterproofing materials. It might be a burst water pipe, but it might also be cracks in your brickwork or dampness on the inside of the wall. After the problem has been resolved, a waterproofing agent can be applied to prevent further damage.
  2. Clogged gutters not only cause water to spill over and run down your walls, but they also collect water that can eventually seep into the wood or fascia boards of your roof, causing decay, leaks, and mold if left unchecked. If you clean your gutters twice a year, you may prevent all of these problems and maintain your home in good health.
    • waterproofing coating for concrete, a cement-like compound that permanently binds to concrete and masonry and can be applied to any surface, even painted walls;
    • Concrete sealer based on silicates, which forms a waterproof covering when exposed to the moisture in masonry and concrete; this sealer should be applied to bare, previously uncoated walls.
    • Waterproofing paint is quite similar to acrylic wall paint, with the key distinction being that it provides superior waterproofing capabilities. Choose a formulation made to let walls breathe and release moisture if you want to keep them in good condition. It’s okay to use this on previously painted walls.
  3. Adding a waterproofing chemical to the plaster will make the walls seem better, make them stronger, and prevent water damage. Even though most exterior plasters already have waterproofing properties, adding a waterproofing admixture to the plaster will completely eliminate water infiltration issues and make sure they don’t come back.
  4. In order to successfully waterproof outside walls, it is necessary to first ensure that the walls are in good condition. In order to fix the holes and cracks, you will need a high-quality filler. You should wait until the filler is completely dry before grinding it. To guarantee effective adhesion between the waterproofer and the substrate, sand down rough, uneven parts, rinse the surface with water, and allow the walls dry fully before applying the waterproofer.
  5. Use either a roller or a brush to spread the waterproofing agent across the surface. If you need to apply a second layer, wait until the first one is dry. Make sure to use a sufficient quantity to provide a secure barrier.
  6. To determine the efficacy of the products used for waterproofing exterior walls, a water-tightness test must be performed. The test entails spraying water at a 30-degree angle against the wall for a couple of hours. Only if the results of a moisture test reveal that there is absolutely no moisture in your home will it pass. Waterproofing the external walls of your home can not only protect it from costly damage, but it will also increase its value.


How do you fix a crumbling concrete block wall?

Using a small paint scraper, carefully remove all the loose debris, and then brush away the dust. You can utilize concrete bonding agent sold in bottles and a bag of mortar, both of which are stocked at hardware and home improvement stores. Wait for the bonding agent to get sticky before brushing it onto the aged concrete.

How much does it cost to repair a cinder block wall?

The low end is around $200, the middle is around $600, and the high end is around $1,500 to repair a block wall.

How do you repair cinder block mortar?

Tutorial on Repointing Mortar Joints in Cinder Blocks Take Away the Outdated Mortar First! Second, prepare a new mortar mix. The third step is to use water to flush out the cracks. Fourth, fill the vertical joints with mortar. Apply a coat of masonry sealer, the fifth step.

Why is my block wall cracking?

Concrete block walls can develop hairline cracks due to internal stresses caused by shrinkage, creep, and thermal expansion and contraction, all of which are predictable and should be taken into account throughout the design and construction phases.

How do you repair a damaged concrete wall?

Eight Simple Steps to Fixing Your Cracked Concrete Wall

One of the first things to do is to clean it thoroughly.

The second stage is to align the injection points using a nail.

Mix the Two-Part Epoxy Crack Sealer in Step 3.

Four, apply Sealer to the bottom.

Fifth, make a bigger batch of epoxy sealer and apply it.

The sixth step is to apply the LCR Epoxy.

7th Step: Plug All the Holes in the Ports.

How do you repair a hole in a cinder block wall?

One bucket of Portland cement, three buckets of sand, and enough water to form a firm patching paste. Apply the patching compound to the damaged area. Pack the compound into the hole using the trowel’s corner or your finger.

Can you repair cinder block wall?

It’s true that cinder block walls are durable, but they can eventually develop fractures and holes due to normal wear and use. Depending on the severity of the damage, you may need to replace pieces of the wall to ensure its stability. The wall can be repaired if the damage is evaluated and the affected portion is filled or replaced.

How much does a cinder block wall cost per foot?

A cinder block wall can cost anywhere from $15 to $30 per square foot to build. This equates to $60 to $240 per linear foot.

What does it cost to replace a cinder block foundation with concrete?

Quotes for Repairing a Block Foundation – Estimates and Options $650 $250 – $10,000 HomeAdvisor $3,990 $400 – $11,000 FixR $6,000 $400 – $12,000 Price range for ImproveNet is from $975 ($75) to $10,000 ($10,000).

When should I be worried about cracks in block walls?

Minimal cracking in a concrete block wall is usually nothing to worry about. A wall’s structural integrity should be evaluated if you find a crack and also see evidence of infestation, water damage, or mold growth. Always remember that prevention is better than cure.

How do you make a block wall stronger?

Install a base of solidly compacted material so your wall stays flat. A level wall provides modular blocks, stone and timbers with more surface contact with the courses above and below them. They fit together more tightly. In other words, the greater the surface area of contact, the greater the friction, and the stronger the wall.

Removing Efflorescence from Concrete Block Walls - Today's Homeowner

What is the best concrete repair product?

For the wall to remain level, a sturdy foundation must be installed. Modular blocks, stone, and timbers benefit from increased surface contact with the courses above and below them when the wall is level. They now have a tighter fit. Since increased friction results from increased contact, a thicker wall can be achieved with greater contact.

How do you fix a crack in a cinder block basement wall?

Use a caulking gun and an epoxy-based compound to fix cracks in the basement wall. Epoxy can be used to repair a wide variety of cracks, including those in the mortar between concrete blocks. Simply insert the tube’s tip into the crack and push the trigger to apply the sealant.

How do you fill a hole in a concrete exterior wall?

Use a putty knife to mix the cement until it resembles thick peanut butter in consistency. Be sure to only mix as much cement as you will need in the next three minutes. Putty knife or trowel the hydraulic cement into the hole tightly. Swiftly smooth the patch’s surface before the cement hardens.

What is the difference between concrete blocks and cinder blocks?

Hollow, rectangular structures called cinder blocks are commonly used in building. They are formed from a combination of concrete and coal cinders. But concrete blocks are typically flattened structures composed of steel, wood, or cement.

Should you fill cinder blocks with concrete?

Filling cinder blocks with concrete is an excellent way to increase their strength. Simple to implement, this is a great way to add significant durability to your cinder blocks. Cracked cinder blocks are another common problem that can be fixed with concrete.

Are poured concrete walls cheaper than block?

How much more expensive is a poured concrete base than a block wall base? The price of building materials and labor typically varies with location. The cost of poured walls is typically roughly 20% lower than that of brick foundation walls.

Can you replace a cinder block foundation with poured concrete?

You can even demolish the existing wall and build a new one out of poured concrete instead of using blocks. This is the most costly choice, but it may be necessary in specific cases and it will last longer.


While concrete walls are great for any structure, they are susceptible to moisture damage, notably efflorescence. Knowing how to clean water damaged concrete masonry unit walls is essential if you want to maintain the building’s aesthetic appeal. This knowledge will aid you in maintaining the optimal condition of your walls.