Roof Waterproofing - Coatings, Sealant & Membranes

Roof waterproofing is the process of sealing a roof so water cannot pass through it. It includes applying liquid coatings such as elastomeric, acrylic, or silicone, sealing flashing and penetrations, installing flat-roof membranes, and adding moisture barriers below the roof deck. The goal is a continuous water-tight surface that stops leaks before they reach your insulation, drywall, and framing.

It depends on the system. Acrylic and elastomeric roof coatings typically last 10 to 15 years before recoating, silicone coatings often last 15 to 20 years, and flashing or penetration sealing lasts 5 to 10 years. In Jacksonville's heat, humidity, and roughly 50 inches of rain a year, a quality silicone or elastomeric coating on a clean, properly prepared roof gives the longest service life.

No. Waterproofing seals and extends a roof that is still structurally sound, usually at a fraction of replacement cost. A roof coating costs roughly 1.50 to 4.00 dollars per square foot, while a full replacement costs much more. If your roof has rotted decking, sagging, or widespread failure, replacement is the right call. We inspect first and tell you honestly which option fits your roof.

Yes, when the leak source is identified and repaired first. We trace the leak to its source, repair damaged flashing, decking, or membrane, then apply the waterproofing system over a sound surface. Coating over an active, undiagnosed leak only traps moisture, so we always diagnose and repair before sealing.

Most roof coatings run roughly 1.50 to 4.00 dollars per square foot installed, depending on the coating type and roof condition. Silicone and multi-coat systems sit at the higher end. Sealing flashing and penetrations on a residential roof is often a few hundred dollars. We provide a free inspection and a written estimate with exact pricing for your roof before any work begins.

Flat and low-slope roofs are common on commercial buildings downtown and on Southside, and they hold standing water longer than pitched roofs. The most effective options are silicone or elastomeric coatings over a cleaned surface, single-ply membranes such as TPO or EPDM, and reinforced seams at every penetration. Silicone handles ponding water well, which matters in Jacksonville's heavy rain.

Yes. Skylights, chimneys, vents, and valleys are where most roof leaks start because flashing fails there first. We reseal or replace the flashing, then apply a flexible sealant or coating that bonds to the surrounding roof so water sheds away from these vulnerable transitions instead of seeping under them.

Yes. We offer financing so you can waterproof your roof now and pay over time with low monthly payments. This lets you stop a small leak before it becomes costly structural damage. You can also apply for roof financing online and we will walk you through the options during your free estimate.

Waterproofing is not a cure-all. A coating extends the life of a sound roof but will not fix a structurally failing or badly rotted roof, it has to be reapplied every 10 to 20 years depending on the product, and it must be applied to a clean, dry, properly prepped surface or it can peel. On a roof near the end of its life, replacement is the better value, and we will tell you honestly which one your roof needs.

It depends on the roof. Silicone coatings handle ponding water and intense Florida UV well and are popular on flat and low-slope roofs. Acrylic and elastomeric coatings are reflective and cost-effective on sloped and metal roofs. Peel-and-stick membranes and flashing sealant protect seams, valleys, and penetrations. We match the system to your roof type and the problem we are solving rather than using one product for everything.

Yes. Flat and concrete roofs are some of the best candidates for waterproofing because they hold water longer than sloped roofs. We clean and prime the surface, seal cracks and joints, and apply a silicone or elastomeric membrane that creates a seamless waterproof layer. This is common on the flat and low-slope commercial roofs around downtown Jacksonville and the Southside.