Basement Waterproofing Cost in Shreveport, LA: Interior vs. Exterior

Basement Waterproofing Cost in Shreveport, LA: Interior vs. Exterior

How much does basement waterproofing cost in Shreveport, LA? Interior systems typically run $3,000–$7,000, while full exterior waterproofing runs $8,000–$20,000+ for most homes. Basements are uncommon here — our high water table and expansive clay soil make them rare — but the older homes that have them, plus daylight basements on sloped lots around Cross Lake, deal with real water pressure every rainy season. This guide breaks down interior versus exterior waterproofing methods, what each one costs in the Shreveport area, and how to decide which approach your home actually needs.

Interior basement waterproofing manages water after it enters and typically costs $3,000–$7,000; exterior waterproofing stops water before it reaches the walls and typically costs $8,000–$20,000+. The right choice depends on where your water is coming from and what your foundation walls look like.

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Why Basements Are Rare (and Real) in Shreveport

Drive through Highland or Broadmoor and you will see pier-and-beam and slab homes stretching for blocks — almost no basements. There is a reason. North Louisiana’s water table sits high in many areas, and our expansive clay holds water against anything buried in it. Digging a basement here means building a concrete box in soil that wants to fill it, which is why builders overwhelmingly chose slabs and raised foundations instead.

But basements do exist. A scattering of early-1900s homes in the older neighborhoods were built with them, back when a cool underground room was worth the trouble. You will also find daylight or walkout basements on sloped lots — around Cross Lake and in the hillier parts of south Shreveport — where the grade drops enough that one side of the lower level opens to the air. And plenty of homes have what amounts to a partial basement: a below-grade storage room or an old storm cellar under the main floor.

If you own one of these homes, you already know the tradeoff. That below-grade space sits in the wettest soil on your lot, and every spring storm tests it. Waterproofing is not a luxury upgrade for these houses; it is what keeps the lower level usable and the foundation walls sound. The good news is that the methods are proven — the only real question is interior versus exterior, and that comes down to your water, your walls, and your budget.

Interior Waterproofing: Methods and What They Do

Interior waterproofing does not stop water from reaching your foundation walls — it catches the water that gets through and gets rid of it before it damages anything. Think of it as managing the problem rather than preventing it, and for many homes, management is all they need.

Interior perimeter drain with sump pump

This is the workhorse of interior waterproofing. The crew breaks out a narrow strip of the basement floor around the perimeter, installs perforated drain pipe in gravel below floor level, and routes it to a sump basin with an electric pump. Water entering through the wall-floor joint or seeping up through the slab drops into the drain instead of onto your floor, and the pump sends it outside away from the house. Most installations take two to three days, and the disruption stays inside the basement.

Wall sealants and vapor barriers

Masonry sealants and interior vapor barriers slow moisture moving through the walls themselves — the dampness that never quite becomes a puddle but keeps the basement smelling musty. These are supporting players, not standalone solutions. A coat of waterproof paint on a wall with real hydrostatic pressure behind it will blister and peel; used alongside a drain system, though, sealants meaningfully cut humidity.

Dehumidification

In our climate, a basement that never floods can still sit at 70 percent humidity all summer. A properly sized dehumidifier — drained to the sump or a floor drain, not a bucket you empty — keeps the space dry enough to prevent mold on joists, stored belongings, and drywall. For finished basements, this is not optional equipment.

Interior work typically runs $3,000–$7,000 for a full perimeter drain and sump system in a Shreveport-area basement. It is less disruptive than exterior work, it can be done in any weather, and it handles the most common basement water problem — seepage at the wall-floor joint — very well. Our basement waterproofing services start with identifying exactly where your water is entering, because that determines whether interior management is enough. FEMA’s basement flooding guidance at fema.gov is a useful reference on how water gets into below-grade spaces and what homeowners can do about it.

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Exterior Waterproofing: Methods and What They Do

Exterior waterproofing stops water before it touches the walls. It is the more complete solution and the more involved project — there is no way to waterproof the outside of a wall without getting to the outside of the wall.

Excavation to the footing

The crew excavates around the foundation all the way down to the footing, exposing the full height of the basement wall. On most Shreveport homes this means a trench six to eight feet deep. Landscaping, patios, and anything else in the path comes out first. This is the part of the job that drives both the cost and the disruption — it is heavy work, and in our clay it is slow work.

Wall preparation and waterproof membrane

Once exposed, the wall is cleaned and inspected. Cracks get repaired — this is the moment to fix structural issues, since the wall will never be this accessible again. Then a waterproof membrane goes on: typically a fluid-applied or sheet membrane that bonds to the concrete or masonry and blocks water migration. This is fundamentally different from paint-on interior sealants; an exterior membrane resists full hydrostatic pressure because the water pushes it against the wall instead of off it.

Drainage board and exterior drain tile

Over the membrane goes a drainage board — a dimpled mat that creates an air gap so water runs down the wall face to the footing instead of pressing against it. At the footing, new exterior drain tile (perforated pipe in gravel, the same concept as a french drain) collects that water and carries it to daylight or a sump. Then the trench is backfilled, ideally with free-draining material rather than the clay that came out.

Full exterior waterproofing typically runs $8,000–$20,000+ for a Shreveport-area home, driven by linear footage, excavation depth, and how much concrete or landscaping sits in the way. It takes three to five days of on-site work, and your yard will look like a construction zone while it happens. What you get for the money is the closest thing to a permanent answer: water never reaches the walls in the first place. Our foundation waterproofing methods guide compares these approaches in more detail.

Basement Waterproofing Cost in Shreveport, LA

Here is how the options stack up for a typical Shreveport-area basement. Ranges assume a standard residential footprint; larger or more complex basements run higher.

Method	Typical cost range	Best for
Interior perimeter drain + sump pump	$3,000–$7,000	Seepage at the wall-floor joint, water under the slab
Wall sealants / vapor barrier (add-on)	$1,500–$4,000	Damp walls and humidity alongside a drain system
Sump pump replacement (existing basin)	$800–$1,500	Failed pump in an otherwise working system
Dehumidifier, installed with drainage	$1,200–$2,500	Finished basements, chronic high humidity
Full exterior membrane + drain tile	$8,000–$20,000+	Water through the walls, maximum long-term protection

Two cost notes worth knowing. First, exterior work gets meaningfully cheaper if it is combined with other excavation — if you are already digging for foundation repair, adding exterior waterproofing while the wall is exposed saves the cost of digging twice. Second, interior sealants sold as a complete waterproofing solution are the most common waste of money in this category: a $2,000 paint job that peels in two years because the real problem was hydrostatic pressure. Spend the inspection first; it is free, and it tells you which line of this table is actually yours.

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Interior vs. Exterior: How to Decide

There is no universally better option — there is only the option that matches your water. Work through these questions and the answer usually becomes clear.

• Where is the water actually coming from? Seepage at the wall-floor joint or up through floor cracks points to interior drainage. Water visibly pushing through the walls themselves, or damp spots halfway up the wall, points to exterior work. An inspection with a moisture meter settles arguments fast.
• What condition are the walls in? Waterproofing a structurally sound wall is maintenance. Waterproofing a bowing or severely cracked wall without repairing it first is dangerous — the wall needs structural repair before or alongside any waterproofing. See our bowing basement wall repair options if your walls are moving, not just leaking.
• What is your budget and timeline? Interior systems cost a third to half of exterior work and install in days with minimal disruption. If the budget only stretches to interior, a well-built interior system with a sump pump solves most seepage problems completely.
• How long do you plan to stay? For a forever home with chronic wall seepage, exterior waterproofing is the once-and-done answer. For a home you may sell in a few years, interior management often delivers the dry basement buyers want at a fraction of the cost.
• Can the exterior even be excavated? Decks, additions, detached garages, and property lines sometimes make exterior excavation impractical or partial. Interior work has no such constraints.
• Is the basement finished? Finished basements raise the stakes for any water entry and often justify the more complete exterior solution — but they also raise the cost of interior work, since flooring comes up along the perimeter.

When in doubt, start with the inspection. A free evaluation tells you the water source, the wall condition, and which options are actually on the table for your house — which is a better starting point than any price table. The EPA’s mold and moisture guidance at epa.gov is worth a read while you are deciding, since chronic basement moisture becomes a health and air-quality issue long before it becomes a structural one. You can also browse our full foundation repair services to see how waterproofing fits with structural repair and drainage work.

What Waterproofing Will Not Fix

Waterproofing manages water. It does not repair structure, and confusing the two is how homeowners spend thousands without solving their problem.

A bowing basement wall is a structural failure, usually from soil pressure or hydrostatic buildup outside. Waterproofing that wall without addressing the pressure — through exterior drainage, wall anchors, or bracing — is like bailing a boat without plugging the leak. The wall keeps moving, and eventually no membrane or drain changes that outcome. Structural repair comes first; waterproofing protects the repair afterward.

The same logic applies to wide or growing cracks. Hairline shrinkage cracks are a waterproofing question. Cracks you can fit a coin into, cracks that run the height of the wall, or cracks that are visibly wider at one end are a structural question first. And no waterproofing method fixes the water source itself — if your gutters dump at the foundation and the yard slopes toward the house, even the best drain system is working overtime for a problem that grading and downspout extensions would have solved upstream.

Be skeptical of any contractor who proposes waterproofing without looking at the walls structurally, and of any product — paint, injection, miracle coating — sold as a complete solution to a wall that is moving. Water follows the path of least resistance, and so should your money: toward the actual problem.

Frequently Asked Questions

How much does basement waterproofing cost in Shreveport, LA?

Interior systems — a perimeter drain with sump pump — typically run $3,000–$7,000 for a Shreveport-area home. Full exterior waterproofing with excavation, membrane, and drain tile typically runs $8,000–$20,000+. Smaller fixes like a sump pump replacement run $800–$1,500, and wall sealants as an add-on run $1,500–$4,000. The spread is wide because basements here vary so much; a free inspection narrows it to your house fast.

Is interior or exterior basement waterproofing better?

Neither is universally better — they solve different problems. Exterior waterproofing stops water before it reaches the walls, making it the more complete solution for water pushing through the walls themselves. Interior drainage manages water that gets in, usually at the wall-floor joint, at a third to half the cost and with far less disruption. If your walls are structurally sound and the water comes in at the joint, interior is usually the smart money. If water comes through the walls or you want the once-and-done answer, go exterior.

Can you waterproof a basement from the inside?

Yes, and interior waterproofing is a legitimate, widely used approach — not a compromise. An interior perimeter drain with a sump pump handles the most common basement water problem, which is seepage at the wall-floor joint and up through the slab. What interior methods cannot do is stop water from reaching the outside of the walls, so they are not the answer for water visibly pushing through wall faces or for walls under heavy hydrostatic pressure. Paired with wall sealants and a dehumidifier, interior systems keep most basements dry.

How long does basement waterproofing last?

A properly installed exterior membrane and drain system lasts decades — often the life of the home — because the membrane is protected underground and the drainage keeps pressure off it. Interior perimeter drains last decades too; the components that wear out are the sump pump, typically 7–10 years, and the dehumidifier, typically 5–8 years. Budget for those replacements and the system itself keeps working. What shortens any system’s life is a failed discharge — keep the outlet or pump working and the rest follows.

Will waterproofing fix a bowing basement wall?

No — and this distinction matters. A bowing wall is a structural problem caused by soil or water pressure, and waterproofing does not straighten walls or relieve that pressure on its own. Bowing walls need structural repair first: wall anchors, braces, or in severe cases partial rebuilds, often combined with exterior drainage to reduce the pressure that caused the bowing. Waterproofing comes after the structure is stabilized, to protect the repair. Any contractor who offers waterproofing alone for a moving wall is selling you half a fix.

Do I need a sump pump with interior waterproofing?

In almost every case, yes. An interior perimeter drain collects water; the sump pump is what removes it. Without a pump, the drain just gives water a nicer place to sit. The one exception is a basement with enough downhill slope for the interior drain to exit to daylight by gravity — rare in flat Shreveport lots, but it happens on sloped properties. If your system includes a pump, add a battery backup: our heaviest rains come with power outages, and a dead pump during a storm is exactly when you need it most.

Why does my Shreveport basement only leak in spring?

Because spring is when our water table is highest and our storms are heaviest. Winter and early spring rains saturate the clay, the water table rises, and hydrostatic pressure against the below-grade walls peaks — right when a marginal drain system or a small wall crack gets overwhelmed. Summer’s heat then dries everything out and the problem seems to vanish. Seasonal leaking is still a real problem; it means your system is at its limit, and one bigger-than-average storm season is all it takes to turn a spring nuisance into a flooded basement.

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Get a Free Basement Waterproofing Inspection in Shreveport

Every basement leaks for a reason, and the fix depends on the reason — not on a price list. A free inspection identifies where your water is entering, whether your walls are structurally sound, and whether interior management or exterior waterproofing is the right answer for your home.

Call Pelican Foundation Repair at (318) 585-2003, or visit Pelican Foundation Repair to schedule. We serve Shreveport and surrounding communities — see our full service areas across Caddo and Bossier parishes.

Pelican Foundation Repair
6118 Fairfield Ave, Shreveport, LA 71106, USA
(318) 585-2003