Carlisle SynTec Roofing Systems in Pasadena, CA

The place a Carlisle EPDM roof lets go first is the T-joint, the small spot where a lap splice crosses a seam and three layers of rubber stack up. Water finds the step in the surface, the tape edge lifts in the sun, and a hairline path opens that the field of the sheet never had. Carlisle SynTec builds a broad range of single-ply membranes, including Sure-Seal EPDM, Sure-Weld TPO, Sure-Flex PVC and the fleece-backed FleeceBACK sheets, and each one fails at its own small details before it fails anywhere else. We install, repair and maintain Carlisle SynTec systems on Pasadena buildings, and we spend our time on those details because the big flat areas take care of themselves.

Sure-Seal, Sure-Weld and FleeceBACK

The membrane that suits a building depends on what happens above and below it. EPDM is forgiving and quiet, a good choice for a roof with many small penetrations and awkward shapes, and it handles a flexible deck that moves with temperature. TPO from the Sure-Weld line is heat-welded and white, so it earns its keep where the reflectance rules apply. Sure-Flex PVC is the one to specify when kitchen exhaust or lab vents will put grease and chemical vapor on the sheet. FleeceBACK membranes have a fabric layer bonded to the underside, so they are adhered with a low-odor adhesive in a single pass, which suits a roof close to an open window. Owners comparing rubber from Holcim Elevate with Carlisle EPDM will find the chemistry similar and the detail work decisive.

February Rain on Flat Drains

Pasadena sees about 20 inches of rain in a year, and February is the wettest month, with June the driest by a wide margin. The San Gabriel Mountains lift passing storms and leave roughly 6 inches more on the city than falls on downtown Los Angeles. A roof that sat bone dry for months then has to move a winter downpour toward a few small drains. Rubber that has spent summers in the sun is stiff and brittle at the drain flange, and a seam that was borderline in August finishes failing in February. We clear and re-seat roof drains and scuppers, add crickets where water stands, and replace drain flashing before the first heavy storm. A roof that is dry in the first week of February is a roof that had its drains checked in the fall.

Convention Center and Campus Roofs

Buildings that fill with crowds put different demands on a re-roof than an office does. Dating from 1931, the Pasadena Convention Center on East Green Street has three buildings, among them a 50,000 square foot exhibition building and a Civic Auditorium seating 2,997. A roof over rooms like those cannot be torn open during a booked event. Pasadena City College keeps over twenty-five thousand students moving through its Colorado Boulevard campus, which puts the same constraint on every school term. We phase the work by bay, schedule noisy tear-off for the quiet weeks and leave each section closed and flashed at day's end. Civic buildings in the Pasadena Civic Center district and college roofs alike are planned this way, with the schedule written before the first sheet comes off.

Black Rubber, White Sheet and the Aged Value

Standard EPDM is black, and a black roof in a Pasadena summer, where June has recorded 113 degrees, absorbs heat that cooks its own adhesive and stiffens the flashing. For a new nonresidential low-slope roof, California's energy rules call for 0.63 aged reflectance with emittance at 0.75, or else a 75 SRI, and plain black rubber falls short of both routes. White EPDM and white TPO are the compliant paths in the Carlisle range, so we choose between them by looking at the deck, the penetrations and the foot traffic. The October 2023 heat advisory with highs near 100 degrees was a reminder that thermal cycling continues late in the year, and we plan seams and flashing for that range, not the average.

Inspection Records and Seam Checks

Single-ply roofs do best when someone looks at them on a schedule. We walk a Carlisle roof every season, probe or press the seams, re-check each T-joint and record the condition of the drain sumps. Each visit is written up with photos, so an owner sees the same corner of the same roof year over year. That record lets us catch a splice edge that has begun to lift before water finds it, and it lets us spot a trend, such as repeated punctures near one rooftop unit, which tells us where to add walk pads. A Versico sheet on the neighboring building gets the same routine.

Commercial Roofing Questions

Will Carlisle EPDM hold up on a roof that gets daily foot traffic from service techs?

Rubber stands up better to wear than most owners expect, as long as paths are protected. We lay walk pads along the routes crews actually use and keep sharp tools off the sheet. Where traffic is constant, a fleece-backed or thicker sheet buys extra margin. Our recommendation comes from a look at how the roof is used, not from a catalog page.

How do I choose between Sure-Weld TPO and Sure-Flex PVC for a restaurant roof?

Grease is the question. PVC resists animal and vegetable fats better than TPO, which can soften and swell under steady exhaust. If a kitchen vents directly onto the roof, PVC is the safer sheet and a grease containment tray under the exhaust fan helps further. A building with no kitchen exposure will often be better served by the more economical TPO.

Can a leak at an EPDM seam be fixed without replacing the roof?

Often it can, if the sheet around the seam is still supple and the insulation below is dry. We clean the area, lift the failed splice, prime and install a new tape strip with a cover patch at the junction. A moisture survey tells us whether water has traveled, and that answer decides how far the repair has to go.

What does a FleeceBACK roof need over an older masonry building?

A masonry building calls for a close look at the parapets and walls before the membrane is chosen. Brick and block can hold moisture and crumble where the sheet terminates, and the new flashing has to meet sound masonry. We repair the substrate, then adhere the sheet and finish the edges with sheet metal.

Does a Carlisle warranty change what we should do on a roof in a fire zone?

Warranty terms and fire ratings are separate questions, and both need written answers. A listed Class A assembly satisfies the fire rule in a Very High fire hazard zone, while the manufacturer's own conditions govern coverage. We confirm both before we order material, then build to them together.

Have Us Check the Seams on Your Building

Let us look at the T-joints, boots and drain sumps on your roof, because those small details decide how long a Carlisle sheet stays tight. Call to arrange a walk, or call at any hour if the ceiling is already wet.