What Are Termistops?
Pre-Construction Pipe Penetration Flanges
TMA725 high-performance stainless steel blockout flanges engineered to permanently seal concrete slab pipe penetrations against Eastern subterranean and Formosan termites.
Precision Mechanical Protection at Slab Penetration Points
TermiStops are pre-construction physical barrier flanges designed specifically to protect slab utility penetrations. Manufactured from proprietary TMA725 stainless steel mesh, TermiStop flanges attach directly to PVC plumbing pipes, electrical conduits, and drain lines before concrete is poured.
When concrete cures around a utility pipe, natural thermal contraction and curing shrinkage create micro-gaps between the outer edge of the pipe and the concrete slab. Both Eastern subterranean termites and Formosan termites exploit these hidden pathways to enter buildings unnoticed. TermiStop flanges embed permanently into the concrete pour, creating an impenetrable mechanical seal that termites cannot chew through or squeeze past.
"Utility penetrations are the single most vulnerable entry vector on a concrete slab. Concrete shrinks as it cures, leaving micro-gaps around PVC pipes. A TermiStop flange embeds directly into the pour, using marine-grade stainless steel mesh to permanently close that pathway without relying on chemical termiticides."
: Joel Roehling, General Manager of TermiStop USA
Termistop Flanges
Frequently Asked Questions
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A: According to TermiStop USA General Manager Joel Roehling, concrete naturally shrinks away from PVC and copper pipes as it cures. This process leaves tiny gaps around utility conduits. Eastern subterranean termites follow moisture lines along pipes and use these shrinkage gaps to bypass the foundation and enter structural wall voids.
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A: No. TermiStop flanges are manufactured from superior TMA725 stainless steel. The steel wire is too hard for termite mandibles to chew through, and the 0.66 mm by 0.45 mm mesh weave is too small for both Eastern subterranean and Formosan termites to squeeze through.
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A: In a 9-year study conducted by the USDA Forest Service across continental US sites, stainless steel mesh barriers demonstrated 100% control against subterranean termites with zero mesh penetrations. Additionally, independent field testing by the University of Hawaii Department of Entomology proved that Formosan subterranean termites (Coptotermes formosanus) failed to penetrate the steel mesh or pipe sleeves across all test units.