Masonry Cleaning, Efflorescence and Sealing in Syracuse

Usually not. White powder on new masonry is a water report rather than a defect report. Efflorescence needs three things at once: soluble salts in or touching the masonry, water in contact with them long enough to dissolve them, and a pore structure that lets the solution reach a surface where the water can evaporate. On brickwork under a year old, appearing fairly uniformly across the wall, it is called new building bloom, it is put down to normal evaporation of construction water, and in most cases it dissipates on its own if the masonry can dry and the weather is left to clean it.

Only if you want what a sealer gives you. Most sealers darken the surface and enhance its color, and they add protection from stains, oils, dirt and water. They also need reapplication after a period of wear and weather, with the interval depending on use, climate and the quality of the product. So it is an appearance choice with a cycle attached, not a one-time upgrade to the patio. If the problem you are trying to solve is sand leaving the joints, ask for a joint sand stabilizer instead, which is a different product doing a different job.

No, and it can make things worse in a way that is documented. Applying a coating to brickwork that tends to effloresce, without stopping the cause, can trap the salts at the inner margin of the coating, typically 1/8 to 1/4 inch below the surface: the water leaves as vapor through the treated zone and the salts crystallize inside the unit. That is subflorescence, and the pressures involved can be great enough to spall pieces off the brick. The technical guidance is explicit that coatings are not recommended as the sole treatment for an efflorescence problem. Fix the water, then decide about sealing.

One of a short list of named reasons, and most of them are moisture. The surface and joints were not dry, the pavers had not had an adequate period of exposure to moisture, there is a source of efflorescence in the bedding sand, base or soil migrating up through the joints, the base drains poorly, the sealer was not breathable, or it was applied too thick. The fix is removing or re-dissolving the sealer, which costs more than applying it did. On a patio here, a cloudy seal is usually a drainage problem wearing a sealer, so the money is better spent under the pavers.

In the warm half of the year. Masonry should not be cleaned during freezing weather or when freezing weather is expected, because most cleaning methods saturate the masonry and that water can freeze on or inside it. Water-based methods are recommended only where the ambient temperature will be 40F or above and will remain so until the masonry is dry. At Syracuse the normal daily minimum is at or above 40F in exactly six months, May through October, and October carries a normal 3.89 inches of precipitation, the wettest month of the year, so late October is a poor bet for anything that has to dry.

Buy a look at the water rather than another wash. Efflorescence more than a year after construction is generally attributed to excessive water penetration or poor drainage, and it is often at its worst in winter and cold weather, which is exactly when a recurring patch shows up. Look at where water is arriving: gutter and downspout discharge, splash-back off paving, a bed banked against the bottom of a wall, a veneer base with no clearance, or a paved area holding water. Treating the arrival point is the only version of this that ends.

No, and this is the one where we would rather send you elsewhere. Soft, open or crumbling joints are a repair question, and cleaning a wall in that condition can drive water straight into it. Get the joints looked at by a trade that repairs old masonry first. Cleaning, if you still want it, belongs after that work and not before.