Pool Deck Maintenance in The Colony, TX — Cracks, Stains, and When to Resurface
That crack in your Colony pool deck isn't cosmetic — it's your soil talking. Here's what causes deck damage near the lake and when to act.
The hairline crack that appeared in your pool deck last spring is now a quarter-inch gap with grass growing through it. The cool deck coating near the shallow end has faded from cream to gray and feels rougher than it used to. And there's a dark stain spreading from the equipment pad toward the pool that no amount of pressure washing removes. Your pool deck in The Colony is telling you three different things — and ignoring any of them leads to more expensive fixes later.
Pool decks in Austin Waters, Stewart Peninsula, and The Tribute contend with conditions that accelerate deterioration faster than decks in drier, more stable-soil cities like Allen or Murphy. The Colony's proximity to Lewisville Lake introduces higher ambient humidity that keeps concrete surfaces damp longer, encourages mold and mildew growth, and amplifies the freeze-thaw stress cycle during winter. The expansive clay soils throughout Collin and Denton County add ground movement that cracks concrete regardless of how well it was originally poured.
Cracks: What They Mean and What to Do
Not all cracks are equal. The type, width, location, and progression rate tell you whether you're looking at normal settling or a structural problem.
Hairline Cracks (Less Than 1/8 Inch)
What they are: Surface-level cracks that appear in the top layer of the concrete. Common in all concrete pool decks, especially within the first 2-3 years as the concrete cures and the soil settles beneath it.
What to do: These are cosmetic, not structural. Seal them with a concrete crack filler (polyurethane or silicone-based, flexible enough to accommodate minor movement) to prevent water from penetrating and widening the crack through freeze-thaw cycles. A tube of crack filler costs $8-15 and takes minutes to apply.
In The Colony, sealing hairline cracks before winter is especially important. The higher humidity means more moisture enters the crack, and when that moisture freezes, it expands and forces the crack wider. One season of unsealed freeze-thaw can turn a hairline into a structural crack.
Structural Cracks (1/4 Inch or Wider)
What they are: Cracks that extend through the full thickness of the concrete slab, often with vertical displacement (one side higher than the other). These indicate soil movement beneath the deck — the expansive clay is swelling, shrinking, or shifting, and the concrete is responding.
What to do: Structural cracks need professional assessment. A concrete contractor can determine whether the crack is stable (soil has settled and movement has stopped) or active (soil is still moving and the crack will continue to widen).
Repair options:
- Crack stitching ($200-500): Drilling across the crack and inserting steel staples that hold the two sides together. Works for cracks that are stable and won't continue to widen.
- Slab jacking / mud jacking ($500-1,500): Pumping material beneath a sunken slab section to raise it level with the surrounding deck. Addresses the height displacement that creates trip hazards.
- Section replacement ($500-2,000): Cutting out the damaged section and pouring new concrete. Necessary when the crack is too severe for repair or when multiple cracks indicate widespread soil failure beneath the slab.
Cracks Around the Coping (Pool Edge)
Cracks between the pool coping (the capstone around the pool's edge) and the surrounding deck are common in The Colony and throughout North DFW. The pool shell and the deck are separate structures on separate foundations — they move independently as the soil expands and contracts.
This gap should be filled with a flexible sealant (pool deck caulk or a backer rod with polyurethane sealant), not rigid mortar. Rigid fills crack again with the next soil movement cycle. Flexible sealant accommodates movement and keeps water from penetrating beneath the deck.
Re-caulking the coping joint should be done every 2-3 years in The Colony — more frequently than in drier areas because the humidity and moisture accelerate sealant degradation.
Stains: Identification and Treatment
Rust Stains (Orange-Brown)
Cause: Iron in the rebar or wire mesh embedded in the concrete. When water penetrates through cracks or the concrete's porous surface, it contacts the steel reinforcement, which rusts. The rust migrates to the surface as an orange-brown stain.
Treatment: Oxalic acid (available as a commercial rust stain remover for concrete) dissolves iron oxide stains without damaging the concrete. Apply, let it sit for 10-15 minutes, scrub with a stiff brush, and rinse. Repeat for stubborn stains. Sealing the deck after treatment prevents water from reaching the rebar again.
Organic Stains (Green, Black, or Dark Brown)
Cause: Mold, mildew, and algae growing on the concrete surface. The Colony's lake-adjacent humidity creates ideal conditions for surface biological growth, especially on shaded areas of the deck, in expansion joints, and on the north-facing side of the pool.
Treatment: A pressure washer at 2,500-3,000 PSI removes most surface biological growth. For persistent mold, apply a concrete-safe mold and mildew cleaner (sodium percarbonate-based products work well) before pressure washing. Bleach works in a pinch but can damage nearby plants and will discolor colored concrete or exposed aggregate finishes.
Prevention: Improve drainage around the deck so water doesn't pool on the surface. Trim vegetation that shades the deck and traps moisture. Apply a concrete sealer annually to reduce the porosity of the surface, making it less hospitable to biological growth.
Chemical Stains (From the Equipment Pad)
Cause: Muriatic acid, chlorine, or other pool chemicals spilled on the deck during handling. These stains are typically light-colored (bleached areas from chlorine) or etched areas (from acid contact).
Treatment: Chemical etching can't be reversed — the damage is to the concrete surface itself. Minor etching blends in over time as the surrounding concrete weathers. Severe etching can be resurfaced with a concrete overlay or cool deck coating.
Prevention: Handle chemicals on the equipment pad, not on the deck. Keep chemical containers closed and stored in a shaded area. Clean spills immediately with water.
When to Resurface the Entire Deck
Resurfacing replaces the top layer of the deck — the exposed surface you walk on — without demolishing the structural concrete slab beneath. It's appropriate when the slab is structurally sound but the surface is deteriorated beyond spot repairs.
Signs it's time to resurface:
- Cool deck or textured coating is peeling, flaking, or worn smooth across large areas
- Multiple stains that can't be removed
- Surface roughness causing discomfort or abrasion (worn aggregate, exposed stones)
- Widespread hairline cracking making the deck look aged
- The deck appearance detracts from the home's value (relevant for Colony homeowners considering selling)
Resurfacing options and costs:
| Surface Type | Cost per Sq Ft | Typical Pool Deck (800-1,200 sq ft) |
|---|---|---|
| Cool deck (spray texture) | $3-6 | $2,400-7,200 |
| Stamped overlay | $8-15 | $6,400-18,000 |
| Exposed aggregate | $6-12 | $4,800-14,400 |
| Acrylic coating | $3-5 | $2,400-6,000 |
| Travertine pavers | $15-30 | $12,000-36,000 |
Cool deck is the most common and cost-effective option for The Colony — it reflects heat (keeping the surface walkable in 105°F summer), provides a textured non-slip finish, and covers existing imperfections. A typical Colony pool deck resurfacing with cool deck runs $3,000-6,000 and lasts 8-15 years with proper maintenance.
Seasonal Deck Maintenance Calendar for The Colony
Spring (March-April): Pressure wash the deck to remove winter mold/mildew buildup. Inspect all cracks for widening. Re-caulk the coping joint if the existing sealant is cracked or separated. Apply concrete sealer if not done in the fall.
Summer (June-August): Monitor for new cracks from soil shrinkage during heat. Keep the deck clean — pool water splash-out leaves mineral deposits that stain if not rinsed periodically.
Fall (October-November): Apply or reapply concrete sealer before winter. This is the most important single maintenance step — a sealed deck resists moisture penetration, which prevents freeze-thaw cracking, reduces biological growth, and extends the surface life.
Winter (December-February): Keep the deck clear of standing water and debris. Ice formation on the deck is a slip hazard and also accelerates surface deterioration.
Deck showing its age? Hydra Pool Services provides pool and pool area maintenance across The Colony, Frisco, Plano, McKinney, Allen, Murphy, and Parker. Talk to us about your pool →