Drywall compound, also known as joint compound, is an essential material used in construction and renovation to fill seams, repair holes, and create smooth, paint-ready surfaces on drywall. It’s versatile, easy to work with, and forms the foundation for a flawless wall finish.
While drywall compound is a staple for professionals and DIY enthusiasts alike, some unconventional practices, like adding salt to the mix, have emerged over the years.
This surprising technique is believed to offer specific benefits, such as preventing mold growth and extending the compound’s usability in humid conditions.
In this article, we’ll delve into the reasons behind adding salt to drywall compounds, explain the step-by-step process to do it correctly, and outline the potential risks and precautions to consider.
Whether you’re a seasoned contractor or tackling a home project, this guide will help you decide if this method suits your needs.
Why Add Salt to Drywall Compound?
Adding salt to drywall compounds is a little-known technique that can offer several practical benefits, especially in specific conditions. One of the primary advantages is its ability to slow down or prevent the growth of mold and mildew, making it particularly useful in high-humidity environments.
Salt acts as a natural preservative, helping to extend the shelf life of pre-mixed compounds when stored for longer periods. In some cases, it can also enhance the durability of the applied compound, ensuring a more robust finish.
This method is especially helpful in scenarios like renovating older buildings that are prone to moisture issues or preparing drywall for spaces such as bathrooms, basements, or kitchens, where damp conditions are common.
By incorporating salt, homeowners, and contractors can improve the performance of the compound while addressing specific environmental challenges, making it a valuable trick in the right circumstances.
How to Add Salt to Drywall Compound: Step-by-Step Guide
Materials Needed
To get started, gather the following materials:
- Drywall compound: Use either pre-mixed or powdered form, depending on your preference.
- Non-iodized salt: This is preferred as it lacks additives like iodine, which could interfere with the compound’s texture or bonding.
- Mixing tools: A clean bucket, a drill with a paddle mixer attachment, a spatula, and measuring spoons for accurate proportions.
Mixing Procedure
- Measure the salt: Add 1 tablespoon of non-iodized salt per gallon of drywall compound. For smaller batches, adjust the ratio accordingly.
- Combine the ingredients: Pour the drywall compound into the bucket and sprinkle the salt evenly over the surface.
- Mix thoroughly: Use a drill with a paddle mixer to ensure the salt dissolves completely, creating a smooth and uniform mixture. Mix slowly at first and gradually increase speed to avoid clumps.
Application Techniques
- Optimal adhesion and finish: Apply the modified drywall compound as you would normally, using a taping knife or trowel to achieve a smooth surface.
- Adjust consistency if needed: If the compound becomes too thick due to the salt, add a small amount of water and remix until you achieve the desired consistency.
By following these steps, you can enhance your drywall compound while maintaining its workability and effectiveness.
Precautions and Potential Downsides
Things to Watch Out For
- Overuse of salt: Adding too much salt can negatively affect the texture of the drywall compound, making it gritty and harder to apply smoothly. Stick to the recommended ratio (1 tablespoon per gallon) to maintain the compound’s consistency and performance.
- Corrosive effects: Salt can have a corrosive impact on certain surfaces and tools if left uncleaned. After mixing and applying the compound, thoroughly wash all tools to prevent rust or damage over time.
When Not to Use Salt
- Ultra-smooth finishes: Adding salt might not be ideal if your project requires a perfectly smooth surface. The modified compound may slightly affect sanding and the overall texture, potentially leading to imperfections in high-precision work.
- Chemically treated compounds: Avoid using salt with drywall compounds that already include additives or specialized treatments (e.g., mold-resistant compounds). Adding salt may interfere with the product’s intended chemical properties or effectiveness.
By being mindful of these precautions, you can use salt effectively while avoiding unnecessary complications in your drywall projects.
Tips for Working with Modified Drywall Compound
To achieve the best results with modified drywall compounds, start by ensuring a clean work environment to prevent contamination from dust, debris, or other materials that could affect the compound’s performance.
Always test the modified mixture on a small, inconspicuous surface before full application to check its consistency, texture, and adhesion. For extended shelf life, store any unused compound in an airtight container, placing a layer of plastic wrap directly on the surface to minimize drying.
Keep the container in a cool, dry place to prevent spoilage, especially when salt has been added to the mix.
Alternative Methods to Prevent Mold in Drywall Compound
If adding salt isn’t ideal, there are other effective ways to prevent mold in drywall compounds. Consider using anti-microbial solutions specifically designed for drywall compounds, which inhibit mold and mildew growth without affecting the compound’s performance.
Opt for mold-resistant drywall products, such as green board or purple drywall, which are treated to withstand moisture and reduce the risk of mold. Additionally, proper storage is crucial—keep drywall compounds in a tightly sealed container in a dry, climate-controlled environment to prevent exposure to humidity, which promotes mold growth. These methods ensure a longer-lasting and healthier finish for your drywall projects.
FAQs About Adding Salt to Drywall Compound
Will adding salt compromise the strength of the compound?
When used in moderation (e.g., 1 tablespoon per gallon), adding salt does not significantly compromise the strength of the drywall compound. However, overuse may alter its texture, making it brittle or harder to sand.
Can salt be added to both pre-mixed and powdered drywall compounds?
Yes, salt can be added to both types. For pre-mixed compounds, mix thoroughly to ensure even distribution. For powdered compounds, incorporate salt during the initial mixing process with water for consistent results.
How does this compare to commercial mold inhibitors?
Commercial mold inhibitors are specifically formulated to combat mold and mildew without affecting the compound’s texture or application. While salt is a cost-effective alternative, it may not offer the same level of protection or precision as these specialized additives.
Conclusion
Adding salt to drywall compounds is an unconventional yet effective way to prevent mold growth, extend the compound’s usability, and enhance its durability in certain situations.
When used in the correct ratio, it can be a cost-effective solution for projects in moisture-prone areas like bathrooms and basements.
However, to maintain the compound’s quality, it’s important to follow precautions, test the mixture beforehand, and avoid overuse.
