Storage of Materials During Inclement Weather
April 16, 2019
When storing roofing materials prior to install, it is important to remember most roofing materials are not designed to be stored in cold or inclement weather conditions; especially when ambient temperatures dip below 40°F. Membranes, adhesives, equipment, and contractors will perform differently in colder or inclement weather - so planning and considering how the inclement weather will impact material storage, installation time, and quality is critical.

Membrane: Storing roofing membrane at the job site during warm months is straightforward: keep the rolls off the ground (on pallets), and protect them from moisture by using breathable, waterproof tarpaulins. In inclement weather, temperatures could grow colder - the dew point and temperature come closer together; increasing the potential for condensation and frost forming on materials; and storms/winds become more frequent. Keep roofing materials warm and dry by storing them inside a conditioned space or in a heated job trailer. Keeping materials warm and dry will reduce the risk of moisture being introduced into the roof system during construction, and minimize the possibility of deficiencies in the completed roof system. In addition, material rolls will become more rigid as they get colder, requiring additional time to kick out and relax the membrane before installing. In wet or windy conditions, make sure the roof membrane rolls are covered with a breathable-waterproof tarp and that the tarpaulins are secured to prevent wind damage and/or displacement such as with a pallet or bands. Please note that flashings must be heated prior to application, regardless of the season. When these products are heated until warm to the touch, they will be much easier to install, particularly when flashing corners and irregular shapes.

Adhesives/Pressure-Sensitive Products: When dealing with membrane adhesives, there are generally two main categories to consider: solvent-based and waterborne adhesives. Recently, the use of waterborne adhesives has been growing steadily because of low-odor and VOC code requirements. Both types of adhesives have similar manufacturer recommendations for storage temperature, typically between 60° and 80°F. Adhesives, primers, or pressure-sensitive products can be stored at temperatures below 60°F, but must be restored to between 60°-80°F prior to application for best results. When ambient temperatures are expected to fall below 40°F for an extended period, a heated enclosure or hot box is strongly recommended for jobsite storage. This applies to pressure-sensitive products as well.

Insulation: Polyisocyanurate or polystyrene insulation is typically shipped protected by a plastic wrap, plastic bag, or both. This factory packaging is intended for handling the polyisocyanurate in the manufacturing plant and during transit; it should not be relied upon as protection at jobsites or other outdoor storage locations, unless otherwise specified by the manufacturer.

To ensure insulation is properly protected in inclement weather, follow these steps:
  1. Store bundles flat and upright with the bottom of the bundles elevated (2” or more) above a finished surface -preferably gravel, pavement, or concrete - rather than on dirt or grass.
  2. Slit the bundle packaging vertically down the center of the two short sides to prevent moisture accumulation within the package.
  3. Completely cover the bundle with a waterproof tarp and secure to prevent wind damage and/or displacement, such as a pallet.
Following these steps as outlined above will increase the success and longevity of the roofing materials. For more information about storage of materials in inclement weather, please contact John Greko.

    John Greko
    PVC Product Manager
    Product Marketing
    [email protected]
November 26, 2019
Seam Probing

Seam probing is an important final step in the hot air welding process because it is a good indicator to determine if proper fusion has occurred between the membrane layers. Whether the membrane is TPO or PVC, both products need to be probed – but with slightly different techniques. Probing must be done once hot air welds have thoroughly cooled (at least 20 minutes). Premature probing can damage warm seams. Hot air welded seams must be probed throughout the day to check seam quality and to make proper adjustments to hot air welding equipment. The repair of deficiencies must be done routinely throughout the day, but no later than the end of each workday. A blunt or dull cotter pin puller is an acceptable tool to perform the probing task. Carlisle offers a custom-designed Seam Probe that incorporates an ergonomic, threaded handle with a heat-treated, plated steel tip. With continued use these tools will wear down, creating a tip that is too sharp for probing. Blunting the tip is necessary when this occurs. When a substantial amount of probing is necessary, an extension pole can be threaded into the handle of the Carlisle probe. This allows the operator to stand up while probing long runs of field seams. Getting started: Draw your probing tool tip along the edge of the heat welded seam. Apply firm pressure to probe the seam junction, but not into the bottom membrane sheet. The tool will not penetrate into the lap area of a properly welded seam. If the seam probing tool penetrates into the welded overlap area, use a water-soluble marker to mark the beginning and the end of voids or wrinkles in the seam edge. Repair seam deficiencies as soon as possible using the hand held welder. Carlisle recommends that repairs be made the same day deficiencies are discovered. Probe repaired seams after they have cooled completely. If the repair is acceptable, wipe off the water-soluble marker lines; if not acceptable, repair the seam using standard heat welded overlay procedures. Another reason all laps must be probed each day soon after they have cooled is to verify the welder set-up is effective. Particular attention must be given to all membrane intersections and heat welded seams at insulation joints. In addition, there should be periodic checks (including at the start of each day) to verify good peel strength. Considerations when probing TPO systems: TPO does not "flow" like PVC. If you observe an area in which you see "flow" of the bottom ply, scorched areas of detail/flashing membrane, or scorched field membrane welds, these areas should be probed. If these areas are overheated to the point of membrane damage, an overlay repair will be required even if the weld probes successfully. A properly heated field membrane weld will typically have a visual "sheen" approximately 1/2" wide on the bottom sheet at the weld overlap. When walking seams, look for the sheen. If it is not present, probe to ensure weld quality. TPO seams require a minimum 1.5" weld. Welds less than 1.5" must be overlaid as stated in Carlisle’s specifications and details, even if probing does not produce deficiencies. Considerations when probing PVC systems: Welds on PVC systems should produce "bleed out". Bleed out refers to the flow of the bottom ply (of the top sheet) outside of the weld. If you do not see bleed out at seam areas, this increases the probability the seam did not receive enough heat when it was welded. Be sure to probe these areas to ensure weld quality. PVC is a “softer” and more flexible membrane than TPO. As such, a different probe should be used than the one used on TPO roofing systems. The PVC probe should have a blunt/dull tip, or utilize a "hook" screwdriver with a flat head. PVC seams require a minimum 1.5" weld. If you observe welds which are less than 1.5", these should be overlaid following specifications and details, even if probing does not produce deficiencies. Remember, application of Cut Edge Sealant should not begin until all probing is completed. Please contact Jim Gage with questions.     Jim Gage     Senior Technical Specialist     Product Marketing     [email protected]

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November 12, 2019
Benefits of Using Sure-White EPDM Accessories on TPO Systems

Carlisle SynTec Systems allows applicators to use several of its productivity-boosting Sure-White® EPDM Pressure-Sensitive accessories on Sure-Weld® TPO roofing systems with up to 20-year Total System Warranties. Sure-White Pressure-Sensitive (PS) accessories can provide substantial labor savings on projects with hard-to-flash penetrations and are ideal when using a generator and hand welder isn't practical. Regardless of which roof system is being installed, experienced roofers understand there is always a good chance of encountering hard-to-flash roof penetrations, or simply a high volume of penetrations. Determining the best way to flash these items in a productive manner while ensuring a long-term watertight seal can be a serious challenge. This is where Sure-White PS accessories come into play. Keep in mind your alternative EPDM flashing options for TPO systems: Run into a hard-to-flash penetration? Sure-White PS Elastoform Flashing® is an option to consider. This material is highly malleable and adapts easily to odd shapes and surfaces, making it ideal for flashing pipes, scuppers, and other irregularly shaped penetrations. Overwhelmed by hundreds of roof curbs? Boost productivity by flashing curbs with Sure-White PS Cured Flashing in conjunction with Sure-White pre-cut 7" x 9" Inside/Outside Corners. This is the fastest way to flash roof curbs and can reduce application time by up to 70% when compared to non-PS flashing options. Sure-White PS accessories are also a great option for repairs on TPO roofs when access to power is difficult or it isn't practical to use a generator and hand welder. Transporting generators, power cords, and welders to difficult-to-reach roof sections can be cumbersome and labor-intensive. This additional labor can be avoided by utilizing Sure-White PS accessories, since most of these materials will fit snugly into a backpack! If you’re interested in receiving a free trial of Sure-White flashing, please submit a request using this form. APPROVED PRODUCTS: Sure-White Pressure-Sensitive Molded Pipe Seal Sure-White Pressure-Sensitive Pourable Sealer Pocket  Sure-White Pressure-Sensitive Inside and Outside Corners Sure-White Pressure-Sensitive T-Joint Covers Sure-White Pressure-Sensitive Elastoform Flashing  Sure-White EPDM Wall and Curb Flashings      Ryan Ferguson     EPDM Product Specialist     Product Marketing     [email protected]

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October 1, 2019
Special Color TPO Accessories

As the demand for different colored roof membranes has grown, Carlisle introduced its TPO Color Palette with five new colors. In addition to standard white, gray, and tan, Carlisle’s TPO Color Palette now features Rock Brown, Slate Gray, Terra Cotta, Patina Green, and Medium Bronze. Projects that use special color membrane from the TPO Color Palette usually need flashings and accessories in the same color. Here, contractors have two choices, one of which is painting standard accessories to match the membrane. However, this is a great opportunity to use Carlisle’s custom TPO accessory program and avoid painting altogether. All Carlisle custom accessories are available in the five TPO Color Palette colors, as well as white, tan, and gray. Whether it’s a simple split pipe seal or a complex prefabricated curb wrap, Carlisle can make it in all eight TPO colors and get it to the job quickly. In addition to being available in eight colors, here are some other great advantages to using custom flashings from Carlisle: • Save time vs. field fabrication: Trying to field-fabricate flashings can be time-consuming work, even for the most skilled and experienced roofers. Using prefabricated flashings saves time. • No need for paint: There’s no need to prime and paint the accessories to match the membrane; just install and go. • Speed: Custom accessories can be fabricated and shipped within days, not weeks. • Quality: All of Carlisle’s custom TPO accessories carry the Certified Fabricated Accessory (CFA) stamp of approval, indicating they are eligible for coverage as part of the Carlisle Total Roofing System Warranty. Next time you have a project using Carlisle’s TPO Color Palette TPO, consider using custom accessories to make the job faster and easier to install. Sure-Weld TPO Special Color Painting Guide  Sure-Weld TPO Special Color Program  Custom Accessory Quote Request Form      Adam Burzynski     TPO Product Manager     Product Marketing     [email protected]

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