Should You Fill Cracks Before Sealing a Driveway? A Spokane Valley Homeowner's Guide

Why Sealcoat Alone Can't Fix a Cracked Driveway

Sealcoat is a surface product, not a structural fix. It can't stretch across a crack that keeps moving with Spokane Valley's freeze-thaw cycles, so water still gets underneath and the damage keeps spreading. Cracks need to be repaired before sealing or the whole Spokane driveway repair job fails within a season or two.

Sealcoat is thin. Think of it like a coat of paint, not a patch. It's meant to protect concrete from sun, oil, and water, not hold a slab together. Once a crack forms, the ground underneath is already shifting. And no amount of sealer poured over the top or basic concrete repair services is going to stop that movement if applied incorrectly.

We've sealed hundreds of driveways around Spokane Valley. And we've seen the same mistake play out over and over. A homeowner sees a hairline crack, figures a fresh coat of sealer will hide it, calls it done. Six months later, that same crack is back, wider, with sealcoat peeling around the edges like a bad sunburn.

Here's why it happens. Spokane winters freeze the ground hard, then thaw it, then freeze it again. That cycle repeats dozens of times between November and March some years. Every time water sneaks into a crack and freezes, it expands and pushes the crack wider. Sealcoat sitting on top just flexes, cracks, and lets more water through next time.

• Sealcoat has no bonding strength across a gap, so it stretches thin and splits right where the crack already sits.
• Trapped moisture under the sealer keeps feeding the freeze-thaw damage instead of stopping it.
• Weeds and grass roots find their way through unsealed cracks and push the surface apart from below.
• A sealed-over crack hides the problem visually, so it grows unnoticed until it's a full slab failure.
• Traffic and vehicle weight flex the crack daily, breaking the sealcoat bond faster than a smooth surface would wear.

So what works? Concrete crack repair first, then sealing. That order matters more than most people think. A proper crack repair fills the gap with material made to flex with temperature swings, it locks out water, and it gives the sealer a solid, even surface to bond to. Skip that step and you're basically sealing over a wound that hasn't healed.

We handle concrete crack repair and sealing as one job for a reason, not two separate services you book apart from each other.

Types of Driveway Cracks and What Each One Means

Not every crack tells the same story. We've walked hundreds of driveways across Spokane Valley. The crack pattern usually tells us more than the homeowner's whole explanation of what happened. Some cracks are cosmetic. Others are a warning that the slab underneath is already failing. So before you grab a caulk gun or call anyone about sealing, take a real look at what kind of crack you're dealing with.

• Hairline cracks: Thin, shallow, usually from normal concrete shrinkage as it cures. These are common and rarely a structural problem. They still let water in during Spokane winters, so filling before sealing matters.
• Alligator or spiderweb cracks: A web of small connected cracks. Often from a weak base or a slab that's too thin. This pattern usually points to a bigger issue than the crack itself.
• Edge cracks: Show up along the border of the driveway, close to the yard or garage. Often caused by poor drainage or soil that shifts under the edge. Water pooling nearby makes this worse.
• Heaving or settling cracks: One side of the crack sits higher or lower than the other. This means the ground underneath has moved. Filling this type without fixing the cause is just a band-aid.
• Control joint cracks: These follow the joint lines that were cut into the concrete on purpose. They're doing their job by directing where the slab flexes and cracks. Usually low concern.

Here's the thing most homeowners miss. A hairline crack today can turn into an alligator pattern in two winters if water keeps getting in and freezing. We had a customer off Sullivan Road who ignored a set of hairline cracks for three seasons. By the time we got out there, water had worked underneath the slab. The edges were heaving. What could've been a simple crack fill and seal turned into a bigger repair job.

So how do you know which type you've got?

Get down and look at the crack width, direction, and whether the concrete on either side sits level. Hairline and control joint cracks are usually fine to fill and seal on your own timeline. Alligator patterns and heaving cracks mean the base has a problem, and sealing over that won't fix a thing. It just hides it for a season until the freeze-thaw cycle finds the weak spot again.

If you're not sure what you're looking at, that's normal. Most people can't tell the difference between a cosmetic crack and a structural one until it's already too late. That's exactly the kind of thing our concrete crack repair work is built to catch early, before it turns into a full driveway resurfacing job.

Matching Crack Filler to the Type of Crack

Not every crack needs the same fix. A hairline crack behaves nothing like one that's shifted or heaved. Picking the wrong filler before sealing a driveway is one of the biggest mistakes we run into.

We've patched a lot of concrete driveways across Spokane Valley over the years. And we've learned this the hard way: filler that works fine on a surface crack does nothing for a structural one underneath.

• Hairline cracks under 1/8 inch: use a flexible concrete crack filler that can move with Spokane's temperature swings without popping back out.
• Cracks between 1/8 and 1/4 inch: a polymer-modified filler bonds better here and shrinks less as it cures.
• Wide cracks over 1/4 inch: pack these with sand mix or a backer rod first, then top with filler so it doesn't sink.
• Cracks with a vertical offset, where one side sits higher than the other: this points to settling, not just surface wear. Filler won't hold - you need actual concrete repair to fix the base.
• Alligator or spiderweb cracking across a big section: filling each line buys a little time, but the surface is telling you it's near the end of its life.

Here's where Spokane's climate makes this call tricky. Our freeze-thaw cycles run hard from November through March. Water gets into a crack, freezes, expands, then thaws again the next warm day. That cycle repeats dozens of times a winter. A crack that looks small in October can grow wide by April.

We had a homeowner near the Sullivan Road corridor call us last spring. She'd filled a quarter-inch crack herself the summer before with a caulk-tube filler meant for hairlines.

By spring, the filler had popped loose. Water had worked underneath the slab. What started as one crack turned into a section that needed real driveway repair, not a tube of filler.

That's the pattern we see over and over. Homeowners grab whatever's on the shelf at the hardware store without checking the crack width first. Most people don't realize the type of filler matters as much as whether they filled it at all.

So before you seal anything, get down on your knees and measure the cracks. If you're not sure whether you're looking at a surface issue or something structural, our team can walk your driveway and tell you straight. Learn more about how we handle this on our driveway repair page.