Paver Repair in Tacoma That Fixes the Problem, Not Just the Surface.

Every paver problem has a pattern, and the pattern points to the layer that failed. The paver industry groups these as distresses, and its maintenance guide gives a cause and a repair for each one. Walk your patio or driveway right after a heavy rain and match what you see.

Freeze-thaw gets the blame in most paver articles, but it is rarely the main cause around Tacoma. Water is. Our soils stay wet for months, and many lots have dense glacial till or clay under the topsoil. Water that gets into the base sits on that dense layer, and a base that stays saturated loses strength under traffic.

The usual sources are easy to spot. A downspout that empties onto the pavers. A patio sloped toward the house. A lawn or planting bed that drains across the patio and carries silt into the joints. A utility trench or sewer repair that was backfilled without proper compaction. Bedding sand that was laid too thick and moved under load.

Older homes in the North End, Proctor, and the Stadium District often have aging patios and walks with mature trees beside them. When an old surface is low in many places at once, the base was likely too thin from the start, and that is a rebuild, not a repair.

Roots lift pavers in two ways. They grow directly under the base and push it up, or they dry and shrink the soil next to them so the area beside the root sinks. Either way you see a hump with low edges.

Paver surfaces are the right choice near trees, because the units can be lifted and reset without demolition. The repair is to lift the pavers over the root, remove the bedding and base by hand, and decide with the owner, and an arborist on large roots, whether the root can be cut. Then rebuild the base, sometimes with a root barrier, and reset the same pavers.

If the tree is in the planting strip between the sidewalk and the street, it is likely a street tree. Tacoma has separate rules for street tree pruning and removal, so check them before anyone cuts structural roots.

Pavers stay tight because something holds the outside edge. That can be a concrete curb, a buried concrete haunch, or a plastic or metal edge restraint spiked into the base. When the edge lets go, the outer rows rotate outward, the joints open, sand washes out, and the problem crawls inward row by row.

The industry maintenance guide says this distress is most noticeable within about one to two feet of the pavement edge. If your trouble is all along the border, resetting pavers alone will not hold. The repair is to replace or rebuild the restraint, reset the edge rows, compact, and refill the joints.

Edge failures are common where a lawn meets the pavers and the restraint was never installed, or where plastic edging was pinned into soil instead of compacted base.

A re-level that lasts follows the same order every time. Skipping the base step is why so many repairs sink again after one wet season.

Joint sand is not decoration. It locks pavers together so a load on one paver spreads to its neighbors. The industry maintenance guide says to top up joint sand right away if it has dropped more than half an inch below the paver surface.

Polymeric sand is the product most people ask about, and it is often used where it does not belong. The same guide says polymeric sand is not recommended for topping up joints that are partly full. It needs full-depth joints, a clean dry surface, and dry weather to set. In Tacoma, that means a dry forecast, not just a dry afternoon. Polymeric sand that gets rained on before it cures can wash out or leave a hazy film on the pavers.

For most residential repairs we sweep in and compact clean joint sand, and stabilize it where water runs hard, such as under downspouts and roof edges. If sealing is part of the job, the sealer helps hold the joint sand too.

Pavers can almost always be reused, so the choice is about the base, not the pavers. Use these points to judge your own surface before you call anyone.

The industry maintenance guide recommends inspecting pavers twice a year: in spring during or right after rain, when puddles show settlement and run-on, and again in late summer or early fall. It also says pavers that have lifted so their edges stand more than about one eighth of an inch above their neighbors should be fixed before winter, when shovels and plows catch them.

Repairs can be done most of the year, but the base must not be saturated when we compact it. Late spring through early fall is the easiest window. In the wet season we schedule around dry spells and keep the opened area covered.