Which is really the better solution? Are interior waterproofing systems better than exterior systems? That all depends upon your particular scenario. For many Massachusetts and Rhode Island homeowners, however, interior waterproofing systems are better and less expensive.
Exterior Waterproofing
Exterior waterproofing is an extensive process involving removing topsoil, installing a waterproof membrane to the walls, and installing new drainage systems. Exterior waterproofing appears to be a total fix since the issue is being addressed from the outside.
However, the process is extremely invasive. Contractors will destroy landscaping, decks, patios, driveways, sidewalks, and other features in order to complete the work. The average cost of exterior waterproofing can vary greatly, ranging from approximately $10,000 to $30,000 based upon the size and accessibility of your home.
In addition to the high upfront costs, there are additional issues to consider. The waterproofing membranes can break down over time due to exposure to the elements, including freeze/thaw cycles and contact with soil. Drain tiles installed in exterior systems can become clogged with mud and silt when buried under soil. Once these systems have been installed, the only way to inspect or service them is by excavating the area once again, a costly process.
Interior Waterproofing: A More Practical Approach
Interior waterproofing is an approach to managing water entering your basement after it has entered your foundation, but before it causes damage. An interior waterproofing system consists of interior drain tile installed along the perimeter, a sump pump to remove the water, and a vapor barrier on your walls to prevent moisture accumulation.
Interior systems do not involve excavation of your yard. As such, there is no destruction of landscaping, decks, patios, driveways, sidewalks, or other features. Installation typically takes place within two to three days. In addition, the cost of installation is significantly lower, typically ranging from $3,000 to $8,000.
The best part is maintenance. These systems provide access points for cleaning and inspecting the drain tile. Sump pumps, which are an integral part of interior systems, are located in your basement so you can check their operation regularly. Therefore, if any portion of your system requires maintenance, you’ll know about it before water accumulates.
When Does Exterior Waterproofing Make Sense?
There are some specific circumstances in which exterior waterproofing makes sense. If you’re building a new home, it’s easier to perform exterior waterproofing since the foundation has not yet been backfilled. Also, if you need to perform structural repairs to your foundation, it may be necessary to excavate around your home anyway.
However, for most homeowners who have standard water issues, exterior waterproofing is excessive and unnecessary. You’re essentially paying a premium price to dig up your yard for a system that’s more difficult to maintain and doesn’t last as long. Many contractors advocate exterior waterproofing for financial gain and not necessarily for your benefit.
How Interior Systems Work Better
Interior systems effectively manage water because they address it at its weakest link, the joint where your wall meets your floor. At this point, hydrostatic pressure pushes water into your basement. With an interior system, water is captured at this point before it enters your living space.
Interior systems also work with your home’s natural structure rather than against it. Water that seeps through foundation cracks flows down behind the vapor barrier directly into the drain tile system. The sump pump continuously removes water, eliminating accumulation and subsequent pressure on your walls.
Many modern interior systems come with transferable lifetime warranties. When you sell your home, the warranty transfers to the buyer, providing added value.
Conclusion
While both interior and exterior waterproofing can work, interior systems provide better value, easier maintenance, and much less disruption. Unless you’re building a new home or experiencing serious structural damage, interior waterproofing is likely the better option.
B-Dry New England specializes in interior drainage solutions that keep Massachusetts and New England basements dry without excavation expense and inconvenience. Call us at (401) 300-4943 to schedule a free inspection and receive an honest assessment.