Home / Roofing Manufacturers / Sika Sarnafil Commercial Roofing
Share Sika Sarnafil submittals, roof plans, repair notes, leak locations, and access limits. We will inspect the membrane, seam, attachment, and transition before setting scope.
Sarnafil G 410 is a PVC thermoplastic membrane with fiberglass reinforcement, intended for adhered applications. Sarnafil S 327 is a polyester-reinforced PVC membrane used with mechanically attached systems. Sikaplan is another PVC membrane family. These names identify product families, not a field diagnosis. Check membrane markings, submittals, edge details, and repair records; older roofs can have sections or additions with different materials.
With an adhered system, inspect the bond to substrate and watch for wrinkles, bridging, or loss of contact around curbs. With a mechanically attached sheet, trace fasteners and seams to the deck, then inspect movement at corners and perimeters. Field welds and flashing welds need continuous heat-fused bonds. Probe accessible edges and confirm the detail against the relevant system documentation; one weak point does not prove the whole field has failed.
For a PVC roof, the PVC assembly inspection can identify the correct seam and flashing approach. TPO has a different polymer formulation and should not be used as a drop-in patch. A TPO system review helps keep a mixed roof area distinct from PVC sections.
Heat-welded PVC seams depend on a clean bonding surface and controlled temperature, pressure, and travel speed. Inspect the overlap, end laps, T-joints, corners, and terminations. Look for fishmouths, contamination, incomplete fusion, or a patch that bridges movement rather than following the detail. A probe test can expose a separable edge, but the result should be mapped to a roof plan and compared with nearby seams before setting a repair limit.
At pipes and rooftop units, flashings need to rise, terminate, and shed water without leaving a channel behind the boot. At a drain, follow the membrane into the bowl and inspect the clamping ring, sump, and overflow route. Metal termination should remain secure while allowing the designed movement. A penetration and curb flashing repair can address a localized transition after the failure path is confirmed.
Service crews can disturb flashing while replacing equipment, cables, or controls. Photograph the detail before temporary protection is removed. Keep the repair material and primer matched to the actual sheet. If several penetrations show the same condition, investigate the common cause instead of adding separate patches without checking the layout.
Nearby Detroit 1991-2020 normals show about 45 inches of annual snowfall and a wide swing between January and July average temperatures. Those values are regional data, not a Sterling Heights roof observation or design load. Snow can cover a seam or outlet, then melting and refreezing can leave ice at a drain or edge. Mark what was concealed and return when safe access allows a reliable view.
PVC sheet and metal can respond differently to temperature change. The details that connect them need enough securement and flexibility to retain the water cut-off. Check terminations, curb corners, expansion joints, and long panel runs after seasonal movement. If a wrinkle develops, trace the attachment and substrate before trimming it. A change in surface appearance may come from multiple causes.
The snow and ice damage review can separate a frozen drain or impact finding from ordinary seasonal cover. Document the actual membrane condition, water path, and access limit. Weather alone does not establish a damaged system.
A sound sheet can conceal wet insulation, a loose cover board, or a deck transition that has shifted. Check for soft areas, movement, staining at the underside, blistering, and repeated leak records. Use a moisture survey to map suspect zones, then place test cuts where the result changes the repair boundary. Record each layer and its condition. Close the test opening that day with an approved detail.
Insulation and cover board selection affect drainage, attachment, and seam support. If a recover is considered, confirm existing layer count, moisture, slope, fastener capacity, edge metal, and applicable code requirements. When the deck changes from one bay to another, the attachment and transition detail may need a closer design review. G series and S series configurations should be assessed in the installed condition rather than inferred from the membrane brand alone.
Michigan's 2021 commercial building code became effective April 9, 2025. The code reference is relevant to project planning, but the permitting authority and design determine which provisions apply. Preserve the assembly drawings and submittals as the repair or replacement scope is prepared.
A localized weld defect on a dry, stable sheet may call for a compatible PVC patch. Widespread seam separation, wet insulation, recurring edge movement, or failing cover board points to a broader investigation. A coating is not a substitute for a compatible membrane repair, and a recover needs its own load, layer, moisture, attachment, and drainage review. Define the prepared surface, patch size, flashing transition, edge work, and close-in procedure.
Replacement planning should list removal depth, board assumptions, penetrations, rooftop equipment coordination, perimeter details, and temporary weather protection. Work hours, delivery routes, production or tenant access, and weather windows affect daily sequencing. The occupied-building reroof sequence can define how each zone stays protected while crews move across the roof. Commercial roof repair can address a verified defect while preserving unaffected membrane when the assembly permits.
On an adjoining area with another product family, Carlisle Sure-Weld TPO and Holcim UltraPly TPO use thermoplastic seams but have their own manufacturer details. Carlisle system documentation and Holcim product review keep those sections from being folded into the PVC scope by assumption. Send membrane records, drawings, repair history, leak location, and access rules. We will verify the system and document the recommended next action.
G series uses fiberglass reinforcement for adhered layouts; S series uses polyester reinforcement in mechanically attached configurations. Verify the specific installed product and detail.
Do not assume the materials can be joined. Identify the membrane and follow a compatible repair detail for the installed system.
It identifies a separable edge at the test location. Map the finding and inspect nearby seams before defining the repair boundary.
Review moisture, deck, layer count, attachment, drainage, edge details, and project requirements before treating a recover as viable.
Share product labels, system drawings, repair history, known leaks, access rules, and any areas that could not be inspected safely.
Share Sika Sarnafil submittals, roof plans, repair notes, leak locations, and access limits. We will inspect the membrane, seam, attachment, and transition before setting scope.
