What Surfaces Should Never Be Pressure Washed on Commercial Buildings
Pressure washing is not the right answer for every part of a commercial building. Some materials can handle strong water pressure, but others can be damaged quickly by it. A recommended pressure washing service should know when to use pressure and when to switch to a softer method, especially on coated walls, roofing, stucco, brick, and wood details.
Painted and Coated Exterior Surfaces
Painted and coated surfaces can be damaged by high-pressure water. This includes painted metal panels, coated aluminum siding, and exterior surfaces with waterproof or elastomeric coatings. Once the coating is stripped, the material underneath is exposed to the sun, moisture, and future staining.
Recoating a commercial exterior is not a small expense. It is much easier to clean the surface carefully than to repair a coating that was blasted off. Soft washing removes dirt, algae, and mildew without tearing into the finish.
EIFS and Stucco Cladding
EIFS and stucco may look solid, but they are not made for direct high-pressure cleaning. EIFS has layers beneath the surface that can trap moisture if water is forced through the finish. Once moisture gets behind it, damage can remain hidden until repairs become much more extensive.
Stucco has a similar risk. Strong pressure can crack the surface or push water into small openings. Low-pressure washing with the right cleaning solution is the safer choice for both materials.
Roofing on Commercial Buildings
Commercial roofs should not be treated like concrete. Flat roofing systems such as TPO, modified bitumen, and built-up roofing can be damaged by pressure washing. High pressure can lift seams, disturb flashing, and force water under the membrane.
Shingle and tile roofs have their own risks. Pressure can remove protective granules, lift edges, and shorten the roof’s lifespan. Soft washing is the proper method for removing algae, moss, and other growth without stressing the roof surface.
Aging Masonry and Brick with Deteriorating Mortar
Older brick-and-stone buildings require extra care. Mortar can weaken after years of weather exposure, and high-pressure water can knock it out of the joints. Once that happens, water can enter the wall, creating a much bigger problem than surface staining.
A building with weak mortar may need masonry repair before heavy cleaning is considered. Low-pressure methods are safer when the condition of the wall is uncertain. The surface should be inspected before any cleaning begins.
Wood Cladding, Trim, and Fascia Boards
Wood trim and cladding can be damaged quickly by high pressure. Water can raise the grain, strip paint, split older boards, and push moisture into the wood. That damage can lead to peeling, swelling, rot, and more repair work.
Soft washing is better for most wood surfaces. It cleans the exterior without cutting into the fibers or forcing water where it does not belong. This is especially important on older commercial buildings with painted trim or weathered fascia.
What We Use Instead
Soft washing uses low-pressure cleaning solutions to break down mold, algae, mildew, and grime. It is the safer method for surfaces that cannot handle force. It also addresses biological growth at the source rather than just blasting away what is visible.
Pressure washing still has a place. Concrete pads, sidewalks, parking areas, sealed hardscape, and other durable surfaces can often handle stronger cleaning. The key is choosing the method based on the material, not using one approach everywhere.
Related Topics:
