Above-Grade Waterproofing for San Jose Tech Campuses, Offices, Hospitals & Residential Towers
Commercial Waterproofing Contractors in San Jose, CA
San Jose gets only about 15 inches of rain a year, nearly all of it between November and March, so leaks often hide for months and then show up with the first big storm. Through the long dry season, strong sun and hot afternoons bake sealants and coatings until they harden and split. The building moves too, from daily temperature changes and from the faults that surround the valley, and that movement pulls on every joint.
Presto Restoration has more than 25 years of above-grade commercial waterproofing experience across the country. In San Jose we reseal tilt-up panel joints, expansion joints and window perimeters, wet glaze aging curtain walls, coat parapets and ledges and treat concrete and masonry with breathable repellents on tech campuses, office buildings, hospitals, hotels and apartment towers. We also manufacture our own restoration products, including Glass Defender for glass and Leach Stop for precast concrete.
OUR COMMERCIAL WATERPROOFING SERVICES IN SAN JOSE
From one leaking lobby window to resealing every panel on a large R&D campus, we handle all kinds of above-grade waterproofing on San Jose commercial buildings.
Core Waterproofing Services
Expansion joints and the joints between tilt-up panels absorb daily heating and cooling and small seismic movements. Once the sealant fails, rain runs straight into the building. We remove the old material, repair damaged edges and install sealants or preformed systems rated for the movement, and we rout and seal active cracks.
Window perimeters are a leading source of leaks in San Jose offices, labs and apartments. We replace perimeter seals, reseal mullions and repair gaskets, and spotted or etched glass can be restored and protected with Glass Defender.
Parapets, ledges, canopies and balconies take the full force of summer sun and collect water in winter storms. We coat them with high-solids silicone that resists UV, heat and standing water.
Many San Jose office buildings from the 1980s and 1990s tech boom still use their original dry gaskets, which shrink and harden with age. Wet glazing adds a continuous silicone seal between glass and frame, stopping leaks without replacing the windows.
Concrete, stucco and EIFS walls crack from building movement and temperature changes, and those cracks let winter rain in. Elastomeric coatings bridge hairline cracks and stretch with the wall. We repair larger cracks first, then apply the coating at full thickness.
Concrete, block and brick absorb rain and sprinkler water, which leads to staining and slow damage. Breathable repellents reduce that absorption while letting moisture already inside escape, applied after cracks and joints are repaired.
Specialized Restoration-Waterproofing
Waterproofing is one piece of the job. Presto also restores the glass, metal, stone and concrete underneath with products we make in-house, so cleaning, repair and sealing happen in one project.
Precast and tilt-up concrete can leach salts that leave white streaks as rain dries. Leach Stop is our treatment designed to reduce this. We clean off the deposits, treat the panels and reseal the joints between them.
Metal panels, Alucobond cladding, copings and curtain wall frames rely on sealant at every seam, and metal in strong sun moves a lot each day. We replace failed sealants with products built for metal movement and reseal laps and fasteners.
Our Commercial Waterproofing Process in San Jose
Each San Jose waterproofing project follows five steps, and you see what we found and what it costs before work starts.
Building Envelope Inspection
We inspect panel joints, glazing, coatings, flashings and penetrations on every elevation.
Diagnostic Testing
Water tests and moisture readings confirm where water is actually entering.
Scope & Specification
We pick systems for heat, sun and movement and write a clear scope.
Waterproofing Installation
Crews install each system to manufacturer requirements and plan around the hottest hours.
Project Closeout & Warranty
You receive photos, product data and warranty records.
Talk to Presto About Waterproofing Your San Jose Building
Leaks during winter storms, damp walls or panel joints that have split open? Call us or request a quote, and our team will respond to discuss your San Jose building.
Why San Jose Property Managers Choose Presto for Commercial Waterproofing
Presto brings more than 25 years of experience from markets nationwide, and we know which sealants last through long, hot dry seasons and how to work around busy campuses, labs and hospitals.
Our Local San Jose, CA Support Network
A sealed building stays dry longest with yearly checks and small repairs. Presto connects San Jose owners with a local support network for that everyday care.
For routine upkeep and everyday facility support, owners can also contact our sister companies:
Building Restoration San Jose: Hands-on exterior repairs for San Jose buildings.
Building Maintenance San Jose: Routine maintenance that catches problems before the rainy season.
Building Services San Jose: General commercial building support throughout Silicon Valley.
Recent Restoration Projects in California
CALIFORNIA PORTFOLIO HIGHLIGHTS
Browse Presto’s glass, stone and facade projects in California.
San Jose Commercial Waterproofing FAQs
How often should sealants be replaced on a San Jose building?
Most panel and window joints last 10 to 15 years, and less on walls facing the afternoon sun.
What is the difference between waterproofing and water damage repair?
Waterproofing stops water at the outside of the building. Water damage repair fixes interior finishes afterward. We stop the water first so the inside only needs fixing once.
Can waterproofing be done while the building is occupied?
Yes. The work is done from outside, and we schedule around offices, labs, patients and residents.
What is the difference between elastomeric coatings and water repellents?
An elastomeric coating is a flexible film that bridges cracks and changes how the wall looks. A water repellent soaks into concrete or masonry and keeps water out without changing its appearance.
How do I know if waterproofing can wait another year?
Leaks in storms, damp or stained walls or split joints mean it should be done before the next rainy season. If sealants are still flexible and nothing leaks, planned replacement over the next few years is usually fine.
When is the best time for waterproofing work in San Jose?
Spring through fall, so the building is sealed before winter. On the hottest days we start early so materials do not cure too fast.
Other San Jose Building Restoration Services
Keep Water Out of Your San Jose Building
One failed panel joint can soak an office wall in a single winter storm. Tell us what you are noticing, and we will help you get it sealed.
Call us today at 1-800-785-9927 or click Request A Quote.