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"I am very pleased with the work that Keystone Foundation Repair did on my patio!"

Patricia U.


Basement Waterproofing Systems

At Keystone Foundation Repair we are a nationally recognized waterproofing company. Our waterproofing technicians are all trained in the latest basement waterproofing techniques at our product manufacturers headquarters in Boston, MA.

PA and MD Basement Waterproofing

We specialize in the following areas of expertise:

  • The French Drain method for interior basement waterproofing. Keystone's interior waterproofing carries a "Lifetime Warranty"
  • Our polymer sealant keeps the water out and your basement dry
  • Keystone's urethane injection process for basement water leaks. We seal the cracks from the inside, not just the surface
Contact Us for Basement Waterproofing

In the meantime, click on the tabs below to learn how we waterproof basements...

Rubberized Membranes

Many basements only have tar pitch applied to the exterior walls if anything at all. Over time this tar pitch cracks and allows for water penetration. We apply rubberized elastomeric membranes with drainage board to ensure a water tight wall with relief areas for the water. Waterproof warranties are offered on new poured concrete foundation walls that have our rubberized membrane installed.

Interior Building Waterproofing
Urethane Crack Injection Waterproofing

Injection holes are drilled to intersect the crack, (they alternate on each side of the crack). Mechanical injection ports are inserted into the holes. High quality hydrophobic urethane is injected into each port. This urethane expands up to 30 times the original volume. The closed cell nature of the urethane is not subject to shrinkage when exposed to changes in temperature or moisture.

Common Applications

  • Wall Cracks
  • Pipe Penetrations
  • Basement Entryways
  • Form Ties


  • Most jobs done in 1-day with no excavation
  • Done anytime of the year
  • Can be done wet or dry with very little mess
  • Reduces chances of mold and mildew
  • Fully Warranted and Fully Insured
 Professional Urethane Waterproofing
Urethane Waterproofing Tools
Basement Waterproofing
Urethane Waterproofers
Interior Waterproofing Systems

Free, No-Obligation Inspection • Low Rate Financing • Lifetime,Transferable Warranty

Keystone Basement Technologies state of the art systems will transform your old damp wet basement into the dry 21st century. We are a Mid-Atlantic leader in the basement waterproofing and structural repair industries. No other area waterproofing company offers as many multi-method approaches to basement waterproofing. Our work is customized to solve your particular basement problem. All of our work meets or exceeds FHA/VA standards.

Interior Waterproofing>

Interior Waterproofing Systems

  • Leaking wall & floor cracks solutions
  • Sub-floor drain systems
  • Perimeter drainage
  • Sump pump installations
  • Emergency battery backup systems
  • Mold and mildew problems eradicated
  • Crawl space encapsulation
  • Leaks at windows & stairwells fixed
  • Wall sealing
Basement windows stairs walls waterproofing

Contact us for a free on-site estimate

Simply fill out the form, including your name email, phone number, estimate information, and the best time for us to contact you. You will receive a confirmation after submitting the form, and one of our representatives will get back to you as soon as possible.