What is Damp Proof Injection?

Damp proof injection is a fast-acting, long-term solution designed to treat rising damp in buildings. This process involves installing a chemical damp proof course (DPC) using a water-based silicone fluid—commonly known as damp proof cream. By forming a protective barrier within the walls, this method effectively prevents moisture from rising through the masonry, thereby protecting the building from damage.

Damp proof injection, also referred to as vertical injection damp proofing, is a chemical treatment that uses a silicone-based cream to block moisture from entering the walls.

How Does Damp Proof Injection Work?

Here’s a step-by-step overview of how damp proof injection operates:

Application: A silicone-based cream is injected into holes drilled into the mortar joints of the walls.
Penetration: The cream seeps into the masonry, spreading throughout the wall material.
Barrier Formation: Once inside, the cream creates a water-repellent barrier that prevents moisture from rising up through the structure.

Video Credit: Twsitfix YouTube

Benefits of Damp Proof Injection

Prevents Rising Damp: Stops moisture from seeping into the walls, protecting against damp and associated issues.
Protects Building Materials: Keeps timber, floorboards, skirting, and plasterwork from rotting.
Prevents Mold Growth: Reduces the likelihood of mould formation and related health risks.

Understanding Rising Damp

Rising damp can cause significant issues in buildings, leading to both structural damage and health concerns. Common problems associated with rising damp include:

Health Issues: Allergies or respiratory problems can develop from exposure to mold and dampness.
Damage to Walls: Erosion of wall finishes such as paint, wallpaper, or plaster can occur.
Mold Growth: Mold or damp patches may appear on both the inner and outer walls.
Musty Odor: A persistent, unpleasant smell often accompanies rising damp.
Structural Damage: Over time, rising damp can cause irreparable damage to the building’s construction.

When to Use Damp Proof Injection

Damp proof injection is ideal for repairing a damaged damp proof course (DPC) or installing a new one. It’s often used in older properties where the original DPC has failed but is also suitable for newer buildings with flaws in their existing DPC.

Who Should Install a Damp Proof Injection?

This process should be carried out by a qualified professional to ensure it is done correctly. Attempting DIY methods can lead to mistakes that might worsen the problem or cause further damage to the property.

The Chemical Process Behind Damp Proof Injection

Damp proof injection involves a scientific approach using a specially formulated cream to create a water-repellent barrier within the walls of a building. Here’s a deeper look at the process:

How It Works

Injection: Damp proof cream is injected into holes drilled into the mortar joints of the wall.
Chemical Action: The cream contains silane, a silicon-hydrogen compound that penetrates the building material and lines the capillaries.
Curing: Once cured, this creates a horizontal barrier that prevents moisture from rising up through the masonry.

Signs You Need Damp Proof Injection

Musty Smell: A persistent, musty odor in your home.
Wet Walls: Damp patches visible up to 1.5 meters from the ground.
Salt Bands: The appearance of salt bands on internal plaster.

Common Mistakes to Avoid

Incorrect application of the damp proof injection can lead to issues, such as:

Drilling into the Brick: Instead of drilling into the mortar joints, which is the correct method.
Injecting a Second Course: Adding another DPC when one already exists, which can be counterproductive.

Steps to Inject a Damp Proof Course

Here’s how the process of injecting a damp proof course typically unfolds:

Preparation: Before starting, both internal and external walls are prepared, and any affected plaster or decaying skirting boards are removed.
Drilling: Holes are drilled into the mortar bed joint to a predetermined depth and height, spaced about 125mm apart.
Injection: The silicone-based damp proof cream is injected into these holes to create a moisture-resistant barrier.
Replastering: After treatment, walls are replastered to cover the injection sites, leaving them clean and ready for decoration.

Curing Time for Damp Proof Injection

After the injection, the chemical takes about 4 to 8 weeks to fully cure. During this period, the cream spreads through the masonry, creating a robust barrier that effectively halts the movement of moisture.

Suitability of Damp Proof Injection

While damp proof injection is a reliable method, it’s not suitable for every property. It’s crucial to have a professional assessment to determine if this treatment is the best solution for your specific situation.

Rising Damp vs. Other Types of Dampness

It’s easy to mistake rising damp for other types of damp issues like condensation or penetrating damp, as they share similar symptoms. A key distinguishing factor is that rising damp only affects areas from ground level up to around 1.5 meters on the walls, whereas penetrating damp can occur higher up due to external leaks or structural issues.

If you’re dealing with damp problems in your property, understanding the source is the first step to finding the right solution. Contact our team for a professional diagnosis and tailored treatment plan to protect your home from rising damp.

Why Choose Damp Proof Injection?

Our damp proofing experts use a specialised formula called Drywall Plus, known for its high concentration of silane, which ensures maximum effectiveness in forming a water-repellent barrier. Some key advantages include:

Quick Installation: The process is straightforward and efficient.
Minimal Disruption: Causes little disturbance to the building’s occupants.
Low-Hazard Chemicals: Safe for use in occupied properties.
Long-lasting Protection: Offers a durable solution against rising damp.
Guarantee: Comes with a 20 year guarantee for peace of mind.

When Can You Repaint or Redecorate?

After a damp proof injection, it’s essential to allow the walls sufficient time to dry before replastering or redecorating. Our team at Damp and Mould Solutions will advise you on the best time to proceed. In cases where immediate replastering is necessary, additional products like tanking membranes can be used to facilitate quicker decoration.

Maintaining a dry, comfortable, and structurally sound home is crucial, especially during the wet and cold months. Dampness can lead to numerous problems, from cosmetic damage to severe structural issues and health risks. One effective method to combat dampness in buildings is damp proof injection. This blog post will explore what damp proof injection is, how it works, and the benefits it offers. We’ll also address frequently asked questions, providing a comprehensive overview of this essential home improvement technique.

Do Damp Proof Injections Work?

Damp proof injections are a proven method for controlling rising damp in buildings. This process involves injecting a silicone-based fluid or cream into the walls at regular intervals. The substance spreads through the masonry, filling the pores and creating a water-repellent barrier. This barrier prevents moisture from rising through the walls, thus protecting the building from damp-related issues.

The method proves effective solely when dealing with rising damp. However, it falters entirely when confronted with penetrating damp. Alarmingly, over 70% of cases in solid brick houses are misidentified, with rising damp often wrongly blamed for moisture issues that stem from other causes.

Injecting the brickwork creates a new damp course, paired with your chosen method for replastering. As a trained plasterer, I prefer waterproof render. You can either use a membrane and plaster over it or apply a waterproof sand and cement render—both are effective if done correctly. External render should only be removed if it’s faulty or bridging the damp course. Always hire a qualified damp proofer who can provide PCA-accepted or insurance-backed guarantees.

Damp proof injections are highly effective because they directly address the source of the problem. By stopping the capillary action that allows water to rise through the bricks and mortar, this method provides a long-lasting solution to dampness. Additionally, damp proof injections are versatile and can be used on various types of masonry, including brick, stone, and concrete.

How Long Does Damp Course Injection Last?

The longevity of a damp course injection largely depends on the quality of the product used and the skill of the installer. Typically, a well-executed damp proof injection can last between 20 to 30 years. Some manufacturers even offer guarantees for their products, providing peace of mind for homeowners.

It’s essential to ensure that the injections are performed correctly to achieve maximum effectiveness. The walls must be adequately prepared, and the injection must be administered at the correct depth and intervals. Regular inspections can help identify any issues early, allowing for timely maintenance and repairs if necessary.

How Much Does Damp Injection Cost?

The cost of a damp proof injection can vary depending on several factors, including the size of the area to be treated, the type of product used, and the complexity of the installation. On average, homeowners can expect to pay between £500 and £1,500 for a typical damp proof injection treatment.

To get the best value for your money, it’s important to shop around and get quotes from multiple contractors. Ensure that you are getting a high-quality product and that the installer is experienced and reputable. Remember, investing in damp proof injection can save you money in the long run by preventing costly repairs and maintaining the value of your property.

Can You Inject Damp Proofing Yourself?

While it is possible for homeowners to perform damp proof injections themselves, it is generally recommended to hire a professional. The process requires specialised equipment and knowledge to ensure that the injections are administered correctly and effectively.

However, for those who are experienced in DIY and comfortable with the process, damp proof injection kits are available. These kits typically include the injection cream or fluid, a pump or gun, and detailed instructions. It’s crucial to follow the instructions carefully and to prepare the walls properly before starting the injection process.

Damp Proof Injection Kits and Products

There are various damp proof injection products available on the market, including fluids, creams, and kits. Here are some popular options:

Damp Proof Injection Cream: This type of product is easy to apply and provides a reliable barrier against moisture. It’s ideal for DIY enthusiasts and professionals alike.
Damp Proof Injection Fluid: A more traditional option, this fluid is injected into the walls using a pump. It’s effective for treating large areas and provides long-lasting protection.
Damp Proof Injection Kits: These kits include everything you need to perform a damp proof injection, including the injection material and application tools. They are available at various retailers, including Screwfix and other hardware stores.

Damp Proof Injection for Internal Walls

Damp proof injections can be used on both external and internal walls. When used on internal walls, this method helps protect against dampness caused by condensation and rising moisture. It’s particularly useful in areas like basements, where moisture can easily penetrate the walls.

Applying damp proof injections to internal walls can help prevent mold growth and improve the overall air quality in your home. It’s a worthwhile investment for homeowners looking to create a healthier living environment and protect their property from moisture damage.

Damp Proof Injection into Brick

Bricks are a common building material and are particularly susceptible to moisture penetration. Damp proof injections are an effective way to protect brick walls from dampness. The injection material fills the pores in the bricks, creating a barrier that prevents moisture from rising through the masonry.

This method is ideal for older homes with solid brick walls, as it provides a long-lasting solution to damp-related issues. It’s also a cost-effective alternative to other damp proofing methods, such as tanking or installing a physical damp proof course.

Keeping Your Home Dry in Winter and Rainy Seasons

In addition to damp proof injections, there are several steps homeowners can take to keep their homes dry during the winter and rainy seasons:

Ensure Proper Ventilation: Good ventilation helps reduce humidity levels and prevent condensation. Make sure that your home is well-ventilated, especially in areas like kitchens and bathrooms.
Fix Leaks Promptly: Any leaks in your roof, walls, or plumbing should be addressed immediately to prevent moisture from entering your home.
Use Dehumidifiers: In areas with high humidity, a dehumidifier can help keep moisture levels under control.
Maintain Your Gutters: Ensure that your gutters are clear and functioning properly to direct water away from your home.

Conclusion

Damp proof injection is a highly effective and versatile method for protecting your home from dampness. By creating a water-repellent barrier within the walls, this technique helps prevent moisture from rising through the masonry and causing damage. Whether you’re dealing with rising damp or looking to prevent future moisture problems, damp proof injections offer a practical and cost-effective solution.

If you’re considering damp proofing your home, it’s essential to work with experienced professionals to ensure the best results. To learn more about damp proof injection and how it can benefit your home, don’t hesitate to contact us today. Our team of experts is here to help you choose the right products and services for your needs.