Installing a basement floor can be a difficult decision for many homeowners. While concrete is the most popular option, painted floors are an affordable and attractive choice as well. When opting for a painted basement floor, using a waterproof paint is highly recommended, especially in spaces prone to moisture like basements. Below we’ll explore the pros and cons of using waterproof paint in a basement.
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What is waterproof paint?
Waterproof paints, also known as elastomeric paints, are specialty coatings designed to expand and contract with temperature changes and building movements. This flexibility prevents the paint from cracking or peeling. Waterproof paints also contain resins that form a thick, rubbery barrier that seals out liquid water and water vapor.
There are two main types of waterproof paints:
- Acrylic waterproof paints – Made from acrylic resins, these paints provide good protection against moisture at an affordable price point. They can be used on a variety of surfaces.
- Epoxy waterproof paints – Contain epoxy resins for maximum durability and water resistance. Epoxy paints adhere well to concrete and masonry.
Both types of paints create a fully bonded barrier that prevents water seepage into porous concrete floors. The thick, elastic film bridges minor cracks, allowing the floor to expand and contract without damaging the paint film.
Advantages of using waterproof paint in basements
Here are some of the top benefits of using waterproof paint on basement floors:
Moisture protection
Waterproof basement floor paints provide outstanding protection against water damage and flooding. The thick, rubberized coat prevents liquid moisture from seeping into porous concrete and causing issues like mildew, efflorescence, and cracks.
Crack bridging
As concrete ages, it inevitably cracks from shrinkage and settlement. Waterproof paints flex and stretch over these cracks up to 1/16 of an inch, preventing water from penetrating the concrete underneath.
Affordability
At approximately $2-$7 per square foot, waterproof basement floor paint is far more affordable than other basement flooring options. It allows you to transform an unfinished space on a budget.
Range of colors and finishes
Waterproof basement paints are available in many attractive colors and finishes like satin, eggshell, and semi-gloss. You can complement your décor with a bright color or opt for a neutral like grey for a clean, modern look.
Ease of application
Waterproof paints can be rolled or brushed on with ease. While proper prep is crucial, the painting process itself is relatively simple for DIYers. No special tools or skills are required.
Longevity
Quality waterproof basement paints can last for over 10 years before needing touch ups or reapplication. The resins make the paints extremely durable and chemical resistant.
Disadvantages of using waterproof paint in basements
While waterproof paint has many benefits, there are a few potential drawbacks to consider as well:
Prone to scuffing
The thick, rubbery coating of waterproof basement paints makes them prone to scuffing, especially glossier finishes. The paint can get damaged from dragged furniture, active kids and pets, and regular foot traffic.
Difficult to patch
While waterproof paint hides cracks, any new cracks that form will be visible and tricky to patch. The rubberized paint does not adhere well to itself when reapplying to touch up cracks and chips.
Requires extensive prep
Waterproof paint will fail quickly without proper surface prep. You must thoroughly clean and etch the concrete to remove dirt, oily deposits, and any existing paint or sealers. Any cracks wider than 1/16 of an inch must be patched.
Contains VOCs
Most waterproof basement paints contain volatile organic compounds (VOCs) that can be harmful to indoor air quality. Low and no-VOC options are available but may cost more.
Difficult to remove
The same resins that make waterproof paint durable also make it very difficult to remove. You’ll have to use aggressive grinding or sandblasting if you ever want to change the flooring to remove the paint.
Preparing basement floors for waterproof paint
Proper preparation is crucial when applying waterproof basement floor paint. Here are some key tips for getting your concrete floors ready for painting:
Clean and etch the surface
Use a degreaser to remove any oil or waxes from the concrete, then etch with an acidic etcher to rough up the surface profile. This allows the paint to mechanically adhere to the concrete.
Repair cracks and holes
Use a concrete patching compound to fill any cracks wider than 1/16 inch as well as chips, pits, and holes. The patch should be flush with the surrounding surface.
Remove existing coatings
Eliminate any old paint, sealers, or adhesives on the concrete via chemical strippers or mechanical methods like grinding. Waterproof paint won’t bond properly over existing coatings.
Level the surface
Smooth and level any rough or uneven areas using concrete resurfacing compounds. Waterproof paint will not hide surface imperfections.
Prime the concrete
After fully prepping the bare concrete, apply a water-based primer specifically designed for use under waterproof basement paint. Priming improves adhesion and evens out porosity.
Application tips for waterproof basement paint
Follow these best practices when applying waterproof paint over your prepped basement floors:
Read the product instructions
Closely follow the application directions on the specific waterproof paint product you choose. Parameters like dry time between coats, temperature limitations, and topcoat requirements vary.
Apply in thin, even coats
Roll on two to three thin, uniform coats of the waterproof paint. Thick coats are more prone to cracking. Allow proper dry time between coats.
Maintain a wet edge
Work in sections, maintaining a wet edge as you go to prevent lap marks and visible transitions between coats. Work quickly and don’t stop mid-wall.
Use high quality rollers
Invest in premium rollers designed for smooth epoxy or waterproof paint application. This helps achieve an even, consistent finish.
Finish with non-skid topcoat
Adding a final coat of textured, non-skid paint provides extra traction and makes the floor less slippery when wet. Useful for laundry rooms and other humid basement spaces.
Maintenance tips
While waterproof-painted basement floors are designed to last, you’ll need to do some periodic maintenance to keep them looking their best:
- Sweep and mop floors regularly using gentle cleaners.
- Immediately wipe up spills to prevent possible stains.
- Reapply non-skid finishes in high traffic areas as needed.
- Spot repair minor scuffs and scratches.
- Consider recoating every 5-10 years for optimal moisture protection.
Conclusion
Waterproof paint provides outstanding protection against basement moisture damage. When properly applied over well-prepped floors, waterproof paints create a seamless, bonded moisture barrier that prevents water seepage while allowing concrete to naturally expand and contract. While prone to scuffing, waterproof paint transforms damp basements into livable spaces at a reasonable cost. With routine care, waterproof painted floors maintain their moisture resistance for years before needing recoated. For basement flooring that keeps spaces dry through years of humidity and flood risk, waterproof paint is an ideal, budget-friendly solution.