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Those Annoying Basement Leaks

Overview of the Most Common Types of Basement Leaks

American Basement Waterproofing

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Basement Waterproofing Article Series. In this article American Basement Waterproofing provides a general overview of the most common types of basement leaks. Subsequent articles and videos will discuss specific types of basement leaks and repair methods to provide homeowners with information to assist them with the selection of a basement waterproofing company or repairing the problem themselves.

Basement leaks can be annoying and reduce the value of your home.  Water from a leaky basement can also be a source for mold.  The cause of basement leaks vary and may depend on the type of basement you have. Two primary types of basement walls constructed in the building industry consist of the poured basement wall and the cinder block wall.  Many repairs are inexpensive, especially in poured basement walls.

Poor grading, drainage, and obstructed or damaged downspouts can cause water leakage. Cracks in basement walls, rod holes, mortar joints, beam pockets, windows, and clogged or obstructed drain tile can allow water to leak into your basement.

The majority of cracks in basement walls are caused by the settlement and shrinkage of concrete and mortar joints. This normally occurs during the first few years after construction. Settlement and shrinkage cracks are usually vertical in poured walls, and may be both vertical and horizontal in cinder block basement walls.
Rod Leak
Crack and Rod Leaks

Frost and heavy equipment can also cause basement walls and footings to crack and move. Cracks caused by frost and heavy equipment are usually diagonal. They are more likely to occur during the construction phase.

The source of some basement leaks can be difficult for homeowners to find, especially in situations where water is leaking at the area where the basement wall and floor meet.  This type of problem can occur in both cinder block and poured basement walls. Causes can range from a simple sump pump problem to a major drain obstruction that may require the installation of a sub-floor drainage system. The most common types of basement leaks are caused by:

  • Cracks
  • Rod Leaks
  • Window Leaks
  • Window Wells
  • Beam Leaks
  • Chimney Leaks
  • Mortar Joints
  • Pour-line Leaks
  • Drain Obstructions
Basement Leaks Crack Finished Basement Chimney Leak

Leaks in poured basement walls are routinely repaired from the inside of the basement with waterproofing sealants. In many instances, a patio, porch, garage, or deck prevent an outside repair. While hydraulic cement and sealants that shrink may provide temporary relief, the wall must be properly prepared and a professional grade non-shrinking waterproofing sealant should be applied to correct the problem.  Polyurethane epoxy and polyurethane foam injection are the two primary methods that American Basement Waterproofing in Michigan uses to repair cracks in poured basement walls.  Both methods are relatively inexpensive. 

Warning Signs of a Potentially Serious Problem

Some basement leaks can pose health and safety risks. Two examples are where water from a basement leak comes into contact with electrical wiring or creates a mold problem.

Mold thrives in wet basements, especially in finished basements where it can grow on and behind damp drywall, paneling, and carpeting.  This problem has become more severe with the increase of foreclosures and vacant homes on the market. 

No type of mold is good for your health. When dry, mold spores can become airborne and circulate throughout the home. Common health problems caused by mold exposure are headaches, fatigue, eye irritation, runny nose, sneezing, cough, congestion, upper respiratory infections, and worsening asthma. The warning signs of a potentially serious problem are:

  • Mold, mildew, and musty odors
  • Damaged, warped, or dry-rotting paneling or drywall in finished basements
  • Cracked, stained, or discolored walls and floors caused by water leaks
  • Damp or wet basement walls, carpeting, and floors
  • Cracked, chipped, or peeling paint or spray coating on basement walls
  • Spiders, water bugs, termites, and other insects thriving on water leakage

Crack Repair Hydraulic Cement

Electic Leak

Crack Finished Basement

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