Holcim Elevate Commercial Roofing in Gresham, OR

UltraPly TPO is a thermoplastic membrane with heat-weldable seams. RubberGard is an EPDM single-ply membrane with attachment choices that can include adhered, ballasted, or mechanically attached systems. Holcim Elevate also lists PVC roofing. Membrane chemistry affects seam materials, detail construction, and repair methods. The project specification should identify the exact membrane family and assembly rather than state only the manufacturer. Record the product line, attachment method, seam accessory, and flashing material in the submittal. When a building has more than one roof system, label each zone before materials are ordered so similar-looking sheets are not treated as interchangeable. A GAF system comparison and a Johns Manville membrane review can help compare alternatives against the same deck, edge, and access conditions.

Selection depends on the deck, insulation, slope, edge design, roof traffic, exposure, and operating conditions. EPDM can suit some large low-slope fields, while TPO and PVC use welded seams. Those general properties do not replace system design. A RubberGard EPDM review or UltraPly TPO assessment can compare the assembly with existing roof conditions and owner requirements.

For a recover, inspect what will remain below the new membrane. Wet insulation, poor attachment, incompatible coatings, inadequate drainage, and roof-height limits can make overlay work unsuitable. We record the existing layers and explain whether testing or selective removal is needed. The owner authorizes test openings and confirms how they will be closed.

What belongs in the complete roof specification?

A membrane is one layer in a larger assembly. Confirm deck type, vapor control, insulation, cover board, attachment, perimeter securement, and flashing details. A drain bowl or curb may need a different tie-in from the field seam. Roof height and existing parapet dimensions can affect edge treatment after new layers are installed. We measure transitions where possible and identify details that remain inaccessible. The proposed system should address every transition shown on the roof plan.

Use current manufacturer details for the selected membrane and attachment method. A detail for adhered EPDM does not automatically apply to mechanically attached TPO. We check product documents and approved project submittals before ordering materials. A roof insulation and cover-board plan should identify retained materials, new layers, and surface preparation.

Penetrations and equipment require their own scope. Pipe boots, curbs, skylights, expansion joints, and supports can be leak paths if flashing is incomplete or movement is not accommodated. A penetration-flashing review can identify needed work before the membrane field is closed. We also verify that roof drains and overflow paths remain accessible after the assembly is installed.