Tampa has a year-round roof rat (Rattus rattus) problem that the tourist guides do not mention. Roof rats are excellent climbers, active in the palm canopy that lines most Tampa Bay neighborhoods, and they find their way into attics, wall voids, and drop ceilings through openings smaller than most homeowners think possible. The standard benchmark: a juvenile roof rat can compress through a hole 1/2 inch in diameter. An adult can squeeze through 3/4 inch. A gap around a plumbing penetration, a worn soffit panel, a gap in the fascia where it meets the roofline — all of them qualify.
The quarter-inch rule is our exclusion standard: if a probe or a pencil tip fits through a gap in the exterior envelope, a rodent eventually will. On a full exclusion inspection, Carlos identifies every penetration at the roofline, soffit, foundation, plumbing entries, and utility conduits — and documents them with photos before we propose a single trap.
What actually seals entry points
Expanding foam alone is not enough. Roof rats chew through cured foam in minutes — it is soft enough to be a nuisance, not a barrier. The materials that hold are: 1/4-inch galvanized hardware cloth (not window screen — rats chew that too) mechanically fastened over larger openings; copper mesh or steel wool packed into pipe penetrations and gaps before sealant is applied over the top; and heavy-gauge exterior caulk or mortar for masonry gaps. The exclusion takes longer and costs more than spraying a trap bait — but it is the only thing that ends a roof rat infestation rather than cycling it.
Where Tampa rooflines fail most often
In our service area, the most common entry points we find are: the gap between the roofline and fascia board where the soffit panel joins (extremely common in Tampa Bay tract homes); plumbing vent boots that have cracked or separated from the deck; gable vents with torn screening; and the gap around air conditioning line sets where they penetrate the wall. We also check weep screeds on stucco homes — the opening is intentional for drainage but wide enough for mouse ingress and needs a rodent-exclusion screen insert.
A trapping program without exclusion produces a revolving door. We use snap traps in the attic and crawlspace during the exclusion process, remove every carcass, and verify the population is gone before signing off. The 90-day exclusion guarantee means we come back if anything gets through — but in fifteen years of doing this work in Tampa, the properly sealed homes stay sealed.