Basement Waterproofing for Older Homes: How to Keep Your Space Dry
Basement waterproofing is a must for anyone with an older home in the UK. If you own or live in an older home, you’ll understand that, although they have their charms, they come with a set of unique problems. The biggest one is often a damp basement. Leaking walls, rising damp and foundation cracks can all be common issues in an old home. You’ll also be aware of the potential for structural damage, mould, and expensive repairs if the building is without proper waterproofing. Have a read through this guide, so you can be armed with the knowledge to waterproof your basement and prevent damp from ruining your beautiful older home.
Why Do Basements in Older Homes Leak?
Homes built before the 20th century were often not designed with substantial waterproofing in mind. For example, moisture barriers may not have been installed, allowing water ingress and damp problems. Over time, basements in these homes are likely to develop issues because of:
- Rising Damp: This occurs when moisture from the ground rises up through the walls. Older homes tend to suffer from this issue due to the absence of a proper damp-proof course.
- Penetrating Damp: This happens when water from outside enters the basement through cracks in the walls or foundation, often caused by structural shifts or poor maintenance.
- Wear and Tear: It’s an old home. You can expect some deterioration in the building materials over time. For example, the bricks and mortar may break down, or the original damp-proofing measures may no longer be effective.
- Outdated Design: Older basements were often designed without drainage or ventilation, leaving them more prone to moisture build-up and condensation.
Basement Waterproofing Systems for Older Homes
There are a few different types and methods of basement waterproofing and each one is designed to fit each unique basement. Let’s go through the most effective ones for waterproofing older basements.
1. Tanking
This is a commonly used waterproofing technique for older homes here in the UK. It involves applying a waterproof slurry directly to the basement walls and floors. This slurry creates an impermeable barrier to stop water from getting in.
- How it works: A cementitious coating is applied to the walls and floors and once dry, it forms a solid barrier that prevents water from entering.
- Best for: Basements that experience water ingress through the walls, or those built with porous materials that absorb moisture easily.
- Cost: Tanking can range from £1,000 to £5,000 depending on the size of the basement and the extent of the work needed.
- Considerations: While tanking can be very effective, it’s important to ensure the basement is properly ventilated. Without ventilation, tanking could trap moisture inside, leading to condensation problems later on.
2. Damp-proof Membranes
Damp-proof membranes are usually a layer of plastic or bitumen-based material. The membrane is placed between walls and under floors and is particularly useful in older homes that have a rising damp problem.
- How it works: Install the membrane to the interior of the walls and under the floor. It keeps water out as it is a barrier between the damp ground and the inside of the basement.
- Best for: Homes with rising damp or where the original damp-proof course has failed.
- Installation: Usually the walls are lined with the membrane, and the floor is fitted with a moisture-resistant layer underneath.
- Cost: The cost of installation can be between £2,000 and £6,000 depending on the size of the area and the materials used.
- Pros and cons: Membranes are very effective for stopping rising damp but can be tricky to install in homes with irregular walls or uneven floors. You’ll need to consider ventilation to prevent condensation.
3. Sump Pumps and Drainage Systems
Consistent water seepage or even flooding can be a real nightmare. Installing a sump pump or drainage system could be a lifesaver. By directing water away from your home these systems can keep your basement safe and dry
- Sump Pumps: A sump pump is installed in the lowest part of your basement (the sump pit) and pumps out water that collects there.
- Best for: Basements that have regular flooding or water pooling after rainfall. Homes in areas with high water tables will often need a sump pump.
- French Drains: This is a system that includes a channel around the edge of the basement’s foundation. It collects water in this channel before it enters the building.
- Cost: Sump pump installation typically costs between £2,500 and £5,000, depending on the size of your basement and the complexity of the drainage system. French drains can range from £1,000 to £4,000 depending on how extensive the system is.
- Considerations: Installing a sump pump requires a power source, so you may also need to consider backup power in case of outages. Regular maintenance is also needed to ensure the pump continues to work efficiently.
4. Waterproof Sealants
Waterproof sealants can be a perfect and affordable fix for more minor problems such as condensation or small leaks.
- How it works: Waterproof sealants are applied like paint but form a solid, impermeable barrier once dried. They can be used on concrete or brick walls to prevent water ingress.
- Best for: Minor leaks or areas where water ingress is limited to small spots.
- Cost: Applying a waterproof sealant is one of the most affordable solutions, costing between £500 and £1,500 depending on the size of the basement.
- Considerations: Sealants are great for temporary fixes or as an additional layer of protection. However, they won’t solve underlying issues like rising damp or structural damage.
Common Problems to Watch Out For
As we’ve mentioned before, older homes tend to have their own challenges that need to be scaled. When waterproofing your basement, it’s important to stay aware of common problems like:
- Condensation vs. Rising Damp: Condensation often forms when the basement lacks proper ventilation. On the other hand, rising damp occurs when moisture from the ground creeps up through the walls. Identifying which issue you’re dealing with is key to fixing it properly.
- Cracked Foundations: Over time, the foundations of older homes can shift, causing cracks where water can enter. These need to be repaired quickly to avoid bigger structural problems.
- Water Ingress: Water can enter through small cracks in the walls, especially during periods of heavy rain. Regular checks for these entry points are essential.
- Mould Growth: Even small amounts of moisture can lead to mould and mildew in a basement, which can damage property and impact health. Keeping the space dry is crucial for avoiding this.
Hiring a Professional Waterproofing Specialist
Waterproofing an older home’s basement isn’t usually a DIY job. A specialist is necessary for identifying the source of the damp problem and recommending the right solution.
- Why hire a specialist: An experienced contractor will have the expertise needed to assess the specific challenges of older properties, including issues with foundations, rising damp, and the lack of moisture barriers.
- How to choose the right contractor: Look for professionals registered with the Property Care Association or approved by the National House Building Council (NHBC). These are reputable bodies that ensure contractors follow strict UK standards.
- Typical costs: Depending on the extent of the waterproofing work required, costs can range from £1,000 to £10,000. More complex jobs, like sump pump installations or full tanking, will be at the higher end of the scale.
Maintenance Tips to Keep Your Basement Dry
Once you’ve waterproofed your basement, keeping it dry requires ongoing maintenance:
- Regular Inspections: Inspect your basement regularly for any signs of new cracks, leaks, or damp spots, especially after storms or heavy rain.
- Ventilation: Make sure the space is properly ventilated to avoid condensation build-up. Consider adding air vents or using a dehumidifier.
- Check Your Sump Pump: If you’ve had a sump pump installed, test it regularly to ensure it’s working properly, especially before periods of expected rainfall.
- Maintain Your Drainage: French drains and other drainage systems should be inspected regularly to make sure they’re clear of debris and functioning correctly.
Conclusion
Basement waterproofing for older homes can be a little tricky, sometimes expensive and often very necessary. You’ll want to prevent long-term damage from damp, leaks, and rising moisture to protect your wallet as well as your home. Just as we’ve discussed, you could opt for tanking, damp-proof membranes or even sump pumps. A specialist contractor like APP can help you understand the best course of action. Proper waterproofing can be just what your older home needs to keep your basement dry, usable, and safe for years to come.
We’re Ready To Help You
Please get in touch with our friendly team today and we can get the ball rolling on your project sooner than you think.