Clear scope. Clean execution.
How Water Damage Progresses in a San Antonio Commercial Roof
Stage 1 - Entry point: Water enters through a compromised membrane seam, a failed flashing, a cracked pitch pocket, or a blocked drain that creates ponding above a compromised area. The entry point may be as small as a pinhole in a heat-welded seam or as large as a separated parapet base flashing. At this stage there is no visible interior evidence.
Stage 2 - Insulation saturation: Water moves laterally through the insulation layer, following the path of least resistance through insulation joints, fastener plate locations, and compression points from foot traffic. Polyiso insulation absorbs water into its cell structure - once saturated, it does not dry out when the weather improves. The moisture stays trapped in the insulation indefinitely. On San Antonio roofs, this stage can last months or years before interior evidence appears.
Stage 3 - Deck contact and interior infiltration: When saturation reaches the deck level - particularly on concrete deck or lightweight concrete fill systems - moisture begins migrating through the deck. Metal deck develops surface corrosion. Concrete deck develops efflorescence and eventual deterioration. Interior infiltration becomes visible at ceiling tiles, electrical conduit, and wall surfaces at the point where water finds a pathway through the deck.
Stage 4 - Membrane acceleration: Saturated insulation in contact with the underside of a single-ply membrane accelerates membrane deterioration at the saturated zone. The membrane loses adhesion to the insulation substrate, seams in the saturated area face higher stress from the softened substrate, and the UV degradation that the membrane would have experienced over 10 years happens in 3 to 5 years in the saturated zone.
Water Damage Assessment and Repair Scope
Moisture mapping: We use infrared thermal scanning and moisture meter readings to map the distribution of saturated insulation. The moisture map determines the replacement boundary - we replace insulation within the mapped saturation zone plus a conservative buffer to avoid missing the leading edge of water migration.
Core pull verification: We pull cores at the moisture map boundary to verify the moisture meter readings and confirm the depth of saturation. Cores at the boundary that come up dry confirm the mapped boundary is accurate. Cores that come up wet at a location mapped as dry indicate that the thermal scan conditions were not ideal and the boundary needs to be extended.
Insulation replacement: Saturated insulation is removed and disposed of. We install new polyiso at the replacement zone, specified to current IECC 2021 energy code minimum R-25 for San Antonio's Climate Zone 2. New insulation is installed tight-jointed to minimize thermal bridging at the replacement boundary.
Membrane replacement and continuity: New membrane is installed over the replacement zone and integrated with the surrounding existing membrane by heat-welded overlaps extending at least 4 feet into the undamaged field. Seams at the integration boundary are probe-tested. The entry point that allowed the original water infiltration is identified and repaired as part of the water damage scope - we do not replace insulation without fixing the source.
Frequently asked questions
How do I know how much insulation is saturated before you start the repair?
That is exactly what the infrared scan and core pull investigation produces - a mapped area of saturation before any work begins. We provide the moisture map with the repair scope so you can see the estimated replacement boundary before you authorize the work. The actual replacement boundary may shift slightly as we open the roof and physically inspect the insulation condition, but we document any scope change with photographs and explain the basis in writing before proceeding.
Does saturated insulation always need to be replaced?
Yes. Polyiso and mineral wool insulation that has been wet for any significant period does not recover its R-value when it dries - the cellular structure is permanently compromised. Leaving wet insulation under a new membrane voids the manufacturer warranty for the new membrane and guarantees continued moisture retention under the new system. There is no cost-effective alternative to removing and replacing wet insulation.
Can I claim water damage from roof saturation on my commercial property insurance?
Coverage depends on the specific policy language and the cause of the water intrusion - whether it was an acute event (storm, freeze, sudden equipment failure) or gradual deterioration. We document the moisture distribution, the probable entry point, and the insulation condition in a format your adjuster can work from. Coverage determination is the adjuster's role, not ours - we provide the physical facts.
Suspect water damage in a San Antonio commercial roof?
We map the saturation zone, scope the replacement, and document what we find - before any work begins.
Request a Roof Scope