Summer Concrete Maintenance: Sealing Driveways, Patios & Walkways

Why summer is the best time for concrete work

Concrete sealers and repair products require specific conditions to cure properly: surface temperatures between 50°F and 90°F (10–32°C), no rain in the forecast for 24–48 hours, and dry concrete surfaces. Summer provides the longest window of favorable conditions in most climates. Sealing before winter is critical because unsealed concrete absorbs water that freezes and expands, causing spalling (surface flaking), pop-outs, and accelerated crack growth. A sealed driveway can last 25–30 years; an unsealed one in a freeze-thaw climate may need resurfacing or replacement in 10–15 years.

Concrete inspection and crack repair

• Map all damage — walk every concrete surface and note cracks, spalling areas, settled sections, and joint deterioration; rank repairs by urgency: active water entry points first, then structural cracks, then cosmetic issues
• Hairline cracks (under 1/4 inch) — clean with a wire brush and compressed air, then fill with a flexible polyurethane or silicone concrete caulk ($5–$10 per tube); avoid rigid fillers that will crack again with seasonal movement
• Larger cracks (1/4 to 1/2 inch) — use a backer rod ($3–$5 per 20 feet) pressed into the crack, topped with self-leveling polyurethane sealant; the backer rod provides the correct depth-to-width ratio for sealant adhesion
• Spalled surfaces — for shallow delamination, apply a concrete resurfacer ($15–$30 per bag, covers 15–40 sq ft) after thorough cleaning; for spalling deeper than 1/4 inch, a bonding agent and patching compound provide better durability
• Settled or heaved sections — mudjacking ($3–$6 per sq ft) or polyurethane foam injection ($5–$10 per sq ft) can raise settled slabs without replacement; replacement is necessary when slabs are severely cracked or deteriorated ($8–$15 per sq ft for removal and replacement)

Sealing concrete: product selection and application

• Penetrating sealers — silane, siloxane, and silicate sealers soak into the concrete and protect from within; they don't change the appearance, are breathable, and last 5–10 years; best for driveways and walkways ($30–$60 per gallon, covers 200–400 sq ft)
• Film-forming sealers — acrylic and epoxy sealers create a visible surface coating that adds gloss or color enhancement; they last 1–3 years before reapplication; best for decorative concrete, stamped patios, and indoor floors ($25–$50 per gallon)
• Application process — pressure wash the surface (2,500–3,000 PSI) and let it dry completely (24–48 hours); apply sealer with a pump sprayer or roller in thin, even coats; two thin coats are better than one thick coat; avoid puddling, which causes white haze or peeling
• Timing — new concrete should cure at least 28 days before sealing; apply sealer in the morning or evening to avoid direct midday sun, which causes the sealer to dry too fast and reduces penetration

Expansion joint maintenance

• Inspect all joints — check expansion joints between driveway slabs, where concrete meets the garage floor, and along house foundations; deteriorated joint filler allows water to penetrate and erode the subbase
• Remove old filler — use a flat screwdriver or oscillating tool to remove cracked, compressed, or missing joint material; clean the joint with compressed air or a shop vac
• Install new filler — for joints under 1/2 inch wide, use self-leveling polyurethane caulk; for wider joints, insert a backer rod first; flexible materials are essential — rigid fillers will crack within one freeze-thaw cycle

When to call a concrete professional

Homeowners can handle crack filling, joint maintenance, and sealer application with $50–$200 in materials and a weekend of work. Call a licensed concrete contractor for: slabs that have settled more than 1 inch (mudjacking or foam leveling, $500–$2,000 per slab), extensive spalling over more than 25% of the surface (full resurfacing, $3–$8 per sq ft), cracks wider than 1/2 inch that indicate subbase failure, stamped or decorative concrete resealing (specialized products and techniques), or new pour work adjacent to existing concrete (proper bonding and jointing requires experience). Get at least 3 quotes for any concrete work over $1,000 — pricing varies significantly between contractors.