719 Foundation
Waterproofing

DIY Basement Waterproofing vs. Hiring a Pro: What Works and What Doesn't

Some basement leaks you can fix yourself. Others will cost you thousands if you try. Here's how to tell the difference before you buy a tube of caulk.

·6 min read·719 Foundation Team

In Colorado Springs, 60-70% of basement moisture problems stem from poor surface drainage, not foundation failure, making some DIY fixes viable while others require professional intervention costing $3,000-$15,000.

Key Takeaways

  • 60-70% of Colorado Springs basement leaks caused by surface drainage issues, not foundation failure.
  • Downspouts should extend 4-6 feet from foundation; grading should drop 6 inches per 10 feet.
  • Hydraulic cement costs under $50 but is temporary; hydraulic pressure requires professional sealing systems.
  • Cracks wider than 1/4 inch indicate structural movement; professional repair ranges $3,000-$15,000.

Not every basement leak needs a contractor. Some problems are genuinely within reach for a handy homeowner with a weekend and $200 in materials. Others look manageable on the surface but have an underlying cause that no amount of waterproofing paint will fix.

Here is an honest breakdown of what works as a DIY project and what should be left to a professional.


What basement waterproofing tasks can homeowners realistically tackle themselves?

Improving Gutter and Grading Drainage

A large percentage of basement moisture problems in Colorado Springs are caused by poor drainage at the surface, not a failed foundation or high water table. Before spending money on interior systems, check these two things first.

Make sure your gutters are clear and that downspouts extend at least four to six feet away from the foundation. Then check whether the grade around your home slopes away from the foundation or toward it. Soil should drop about six inches over the first ten feet from the wall.

Fixing grading and extending downspouts costs almost nothing and solves a surprising number of minor seepage problems.

Hydraulic Cement for Active Leaks

Hydraulic cement expands as it sets and can stop an actively dripping crack or hole in a basement wall. It sets in minutes, is inexpensive, and is sold at any hardware store.

This is a legitimate short-term fix for a specific, isolated leak, like water entering through a pipe penetration or a tie rod hole. The limitation is that hydraulic cement is rigid. Any movement in the foundation, even minor settling, will crack the patch and the leak resumes. It also does not address why water is reaching that point in the first place.

Use it as a temporary measure while you investigate the broader cause, not as a permanent solution.

Waterproofing Paint for Minor Condensation or Surface Seepage

Masonry waterproofing paint (products like Drylok) bonds to concrete and reduces the amount of water vapor that passes through the wall. It works reasonably well for basements where moisture appears as surface dampness or sweating walls rather than active leaks.

The important distinction: waterproofing paint works against vapor transmission and very minor seepage. It cannot hold back hydrostatic pressure, which is the force of water pushing against your foundation from the outside. If you paint over an active leak, you will eventually see bubbling, peeling, and the paint pushing off the wall.


When do you need to call a professional for basement waterproofing?

Cracks Wider Than One Quarter Inch

Hairline cracks in poured concrete are common and often stable. A crack that is wider than a quarter inch, especially one that is growing or has a step pattern, indicates movement in the foundation itself. This is a structural issue, not a cosmetic one.

Filling a structural crack with caulk or hydraulic cement without addressing the underlying movement is like putting a bandage on a broken bone. The crack will reopen, often wider. A professional evaluation determines whether the crack is stable or active and what repair method is appropriate. See our foundation crack repair page for more on what that process looks like.

Recurring Flooding or Standing Water

If your basement floods every time it rains heavily, or if water returns within days of you pumping it out, you are dealing with hydrostatic pressure. The water table or surface drainage is pushing water toward your foundation faster than any surface treatment can resist.

This requires an engineered solution: interior drain tile to collect and redirect water, a sump pump to remove it, or exterior waterproofing to stop it before it reaches the wall. DIY materials do not address the volume or pressure involved.

Bowing or Bulging Walls

A basement wall that bows inward, even slightly, is under lateral pressure from soil outside. This is a structural emergency, not a waterproofing issue. Stop any DIY work and call a foundation specialist immediately.

Bowing walls require steel reinforcement, wall anchors, or carbon fiber straps to stabilize. Water intrusion in this situation is secondary to preventing wall failure. Our bowing wall repair page explains the repair options in detail.

Mold Throughout the Basement

Scattered mold growth across walls, floor joists, or subfloor means moisture has been present for a long time in multiple areas. Cleaning mold without stopping the moisture source will result in it returning within weeks.

A professional can identify all the entry points and design a system that keeps humidity and water out over the long term, something that surface-level DIY treatments cannot accomplish.


The Honest Math on DIY vs. Professional

DIY waterproofing materials run roughly $200 to $500 for sealant, cement, and supplies. Professional waterproofing for a standard Colorado Springs basement averages $4,000 to $8,000 for an interior system, and higher for exterior work.

The question is not just cost upfront. A crack that costs $500 to repair professionally today can grow into a $3,000 to $7,500 structural repair if left alone. Doing the wrong DIY fix can also mask symptoms and delay the proper diagnosis.

If you are not sure whether your situation calls for DIY or a professional, a free inspection costs you nothing and gives you a clear answer. We will tell you honestly if it is something simple you can handle yourself.

Call (719) 735-5324 or book your free inspection online. We also offer basement waterproofing and crawl space repair for problems that go beyond a simple patch.

Don't Wait

Foundation Problems Get More Expensive Over Time.