Paver Sealing & Repair in Seattle

Usually not, and anyone telling you it is essential is selling. Concrete and stone pavers are durable unsealed — plenty of twenty-year-old surfaces in this city have never seen a sealer and are fine. What sealing genuinely does is deepen the colour, make some stains easier to lift before they soak in, and help hold stabilised joint sand. What it does not do is prevent settlement, fix drainage, stop weeds in an unsanded joint, or extend the life of the paver itself. If your patio has a problem, sealing is not the fix for it. If your patio is sound and you want it to look richer, sealing is a reasonable cosmetic choice.

Moisture trapped under the sealer, nearly always. A film-forming sealer applied to a surface that was not fully dry, or applied before a wet spell, seals water into the paver and the bedding below. The water cannot escape through the film, and the result is the white blush you are looking at. It is the single most common sealing failure in this climate and it is the reason we will reschedule rather than seal in a marginal week. The remedy is stripping the sealer and starting again once the surface is genuinely dry, which is more work than the original application.

Yes, and this is most of what we do on existing surfaces. The units lift out, we correct whatever is underneath — bedding, base, or a drainage problem causing it — and the same pavers go back to the surrounding level. Reusing the original units is the point, because a new paver next to ten-year-old ones never matches however good the colour reference is. The one thing worth checking first is why it settled: if water is running under the patio from a downspout or a failed drain, the repair needs to include that or the dip comes back.

Jointing sand with a binder in it that sets firm when wetted, rather than staying loose. The advantages are real — it resists washing out in heavy rain, suppresses weed germination in the joint, and holds better on any slope. The trade-offs are that it needs careful installation and its own dry window to cure, it is harder to lift units out of later, and if it is installed badly or activated wrong you get a haze on the paver face that is tedious to remove. On a sloped surface or one that washes out repeatedly we recommend it. On a flat sheltered patio, standard sand topped up occasionally is perfectly adequate.

Probably not — it is most likely efflorescence, which is a normal property of concrete pavers and not a defect. Salts within the paver migrate to the surface as moisture moves through and leave a mineral deposit behind. It is most visible on new paving, it is more pronounced in a wet climate, and it typically weathers off over the first year or two without intervention. Sealing over active efflorescence locks it in, which is why we check for it before quoting a seal. There is a specific efflorescence cleaner if you do not want to wait, but the patient answer costs nothing.