Clear scope. Clean execution.
The recover-versus-replace decision is the one where building owners most often make expensive mistakes. Recovering a roof that should have been replaced locks wet insulation under a new membrane and guarantees a short service life on the new system. Replacing a roof that could have been recovered wastes capital that could have been deferred another 12 to 15 years. The decision has to be made from physical evidence - core samples, deck inspection, drain condition, and an honest assessment of what warranty path each option opens.
We conduct recover-versus-replace analyses on San Antonio commercial buildings across the full inventory spectrum: older warehouse stock on the IH-35 South corridor near Toyota Motor Manufacturing Texas, mid-rise office buildings in the Stone Oak US-281 corridor, medical campus buildings near the South Texas Medical Center off Fredericksburg Road, and the Brooks City Base mixed-use redevelopment on the Southeast Side. Each building is different. The decision is different for each one.
The analysis we produce is a written document with physical findings - core sample results, deck condition observations, drain flow data - and a recommendation supported by those findings. We do not give a recover recommendation on a building whose insulation cores are reading wet. We do not give a replacement recommendation when the financial case for recover is strong and the physical evidence supports it.
The Physical Assessment: What We Look at First
Moisture survey: We pull five to ten core samples at representative locations across the roof - including areas with visible surface damage, areas downslope from roof drains, and areas that historical leak records suggest have had recurring problems. Each core is pulled through the membrane and insulation, and the insulation is visually and physically assessed for moisture content. Cores at more than 25% saturation across more than 25% of the roof area indicate a recover path that will produce early failure - replacement is the honest recommendation.
The moisture threshold for San Antonio buildings is not just about the percentage of saturated cores. Location matters. Wet insulation directly over an internal drain is a different problem than wet insulation at the center of a large flat roof section far from drainage. Wet insulation over structural steel deck means the deck is at risk - a recover over wet insulation on a steel deck is adding moisture exposure to a steel system that will eventually corrode the deck connections.
Deck inspection: We pull deck inspection ports in areas where moisture cores are wet and at any point where we observe deck deflection or movement at the surface membrane. Metal deck corrosion - which happens under wet insulation on San Antonio roofs that have been through multiple freeze-thaw cycles - changes the project from a recover or replace decision to a deck replacement project. That changes the cost band and the permit category. We identify this before the project is scoped, not after the crew opens the roof.
Drain condition: San Antonio limestone karst generates fine particulate that accumulates in internal drain bowls and at drain connection points. A drain that is partially blocked but functional on inspection can be fully blocked within a recover or replace project cycle if it is not addressed. We assess drain flow, drain bowl condition, and the condition of drain-to-deck connections that are visible during core sampling.
Warranty Path as a Decision Factor
Manufacturer warranties on recover systems are shorter than on new construction systems from most major manufacturers. A GAF, Carlisle, or Johns Manville NDL warranty on a fully adhered recover system may run 15 years versus 20 years on a full tear-off. That five-year warranty difference is a real cost difference over the building's capital horizon - it represents the difference between one and two replacement cycles over a 40-year ownership period.
Some recover paths also have insulation weight limitations that affect the system specification. Recovering over an existing BUR system with a heavy TPO fully adhered cover adds weight to the deck that may require structural review. The City of San Antonio Development Services Department requires a structural engineer's letter for roofing projects that add more than a specified dead load to an existing roof structure - we flag this requirement when the recover option carries a weight addition that approaches the threshold.
We also consider whether the existing system has an active warranty and what the recover option does to it. Recovering over a system with five years remaining on a manufacturer warranty may void that warranty if the recover system is from a different manufacturer or if the recover installation is not performed by an approved applicator. We check the existing warranty terms before the recover option is put on the table.
Capital Horizon and Timing as Decision Factors
The capital horizon question is: when does the owner plan to sell or refinance the building? A building owner with a five-year hold horizon and a roof that passes the physical assessment for recover may be better served by a recover that defers full replacement capital past the hold period. A long-term owner with a 20-year horizon may be better served by replacement that produces a 25-year warranty cycle and eliminates the recover as an interim step.
Timing within the construction season matters in San Antonio. Full membrane replacements can be started and completed in any month of the year, but the July-through-September summer heat window requires early-morning production scheduling that extends project timelines by 20 to 30 percent. A replacement started in late August may still be active in October. A recover in early October - after the heat season - can be completed faster and with less production disruption.
We present the recover and replace options with full capital comparison - installed cost, expected service life in San Antonio conditions, warranty path, and projected maintenance cost - so the owner can make the decision with complete information. We do not make the decision for the owner. We make sure the decision is made on facts, not on whichever option the incumbent contractor prefers.
Frequently asked questions
How many core samples do you pull for the analysis?
Five to ten on a standard commercial flat roof, depending on the building's footprint and the pattern of prior leak reports. For a 50,000-square-foot building with a uniform condition history, five cores in representative locations are usually sufficient. For a building with a complex drainage pattern or multiple prior repair areas, we pull more - the cost of additional cores is small relative to the cost of making the recover-versus-replace call incorrectly.
What does wet insulation actually look like?
At the core level, wet polyiso insulation is visually discolored - the standard cream or yellow color is replaced by a darkened or stained appearance - and physically compressible when the core is in hand. In severe cases the insulation has begun to delaminate. We photograph every core and include the photographs in the written report so the owner can see the physical evidence the recommendation is based on.
Our building is in Stone Oak - does the karst substrate affect the decision?
It can. Stone Oak buildings on the Northwest Side sit on or near the Edwards Aquifer recharge zone karst limestone formation. Karst-related structural movement can produce ongoing stress on roof systems that makes the recover option less durable than it would be on a stable foundation. We flag karst-related flashing stress patterns in our inspection findings and factor them into the service-life estimate for the recover option.
If the analysis recommends replacement, do you also bid the replacement work?
We can, but we do not have to. If the owner wants to put the replacement to competitive bid using the scope we developed during the analysis, we support that process under our competitive bid coordination engagement. If the owner wants us to execute the replacement directly, we can do that as well. The analysis is independent of the downstream work decision.
Make the replace-or-recover decision from physical evidence.
We pull the cores, inspect the deck, assess the warranty path, and give you a written recommendation supported by findings - not a sales pitch for the more expensive option. Call 210-985-8160 or use the form.
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