In summer, the question is whether your crew can get the roof covered before the afternoon storm. In winter, the question is whether the job should start at all.
Cold changes the math on a peel-and-stick install. The same product that went down without a second thought in warm weather now depends on how cold the deck is, what is sitting on the surface, and where the rolls spent the night. None of it is complicated. It is just easy to get wrong when the crew is cold, and the daylight is short.
This is not only a northern problem. A hard cold snap through a Gulf or Southeast market puts the same question in front of crews who do not think of themselves as working a winter climate, often with less practice at it.
The good news is that most of what roofing contractors need for cold-weather work is already written down. It is in the instructions that come with the product going on the roof, and it is more specific than most crews expect.
Why Cold Changes the Way the Adhesive Works
Peel-and-stick sticks to the whole deck rather than hanging from nails. That bond forms in the first moment the sheet touches the surface. Almost everything that makes cold weather harder comes back to that one moment.
Cold slows the adhesive down, stiffens the sheet, and gives it less to grab onto. Our Epistik products use an SBS modified bitumen adhesive built to work in both high and low temperatures, and the line is designed not to wrinkle, crack, or stiffen when it gets cold. The backing peels away in two halves, which keeps the sheet easier to handle on a day when everything else on the roof is harder.
Because the bond is continuous, the membrane also seals around nails driven through it. That matters more in winter than people expect. A roof covered during a cold spell can sit waiting longer than one covered in a clear week, and until the shingles go on, that layer is what is keeping the water out.
How Cold Is Too Cold, and Why It Depends on the Product
Every crew asks the same thing once the cold sets in. It is the right question, and the answer is not the same for every product in our peel-and-stick line.
Epistik Plus, SA-250, and Ice & Water each come with their own installation instructions, published in English and Spanish, and what they ask for in cold conditions is not the same across all three. The three look and handle alike on the roof, so it is an easy thing to assume. Before a cold-weather install, pull the sheet for the product that is actually on the truck rather than the one you used last winter, and check what it says about temperature.
What Is on the Deck Before You Start
A winter deck hides things a summer deck does not. Frost melts and leaves water behind. Debris freezes in place and stops looking like debris. The surface has to be in better shape than it looks. A deck ready for peel-and-stick is free of moisture, clear of nails and anything else sticking up that could damage the product, and smooth and even with no gaps.
Two other points are worth knowing before the truck is loaded. What kind of deck you are working on changes whether a primer is needed. Concrete and masonry decks get primed with a primer that meets ASTM D41, the standard for asphalt primer used in roofing. Wood decks are handled differently, with a temperature condition attached, which is one more reason to read the sheet rather than go from memory. And peel-and-stick does not go over an old roof covering, which is the kind of shortcut that looks more tempting when the weather is working against you.
Winter re-roofs deserve an extra look at the deck itself. Damaged sheathing needs replacing, and loose nails and debris need clearing, before anything peel-and-stick goes down on top. A deck that was borderline in the fall does not get better over a wet winter, and the product on top cannot make up for what is underneath it.
Handling Rolls in the Cold
A roll that spent the night in an unheated truck is not the same roll that left the warehouse. Cold material is stiffer, slower to lie flat, and slower to bond. That is why storage and handling get their own section separate from the install itself, and why rolls should only come out of storage on the day they are going up.
A roll held outside the recommended storage range gets warmed before it goes on, rather than counting on the roof to do it. One more thing worth passing to the crew: salt is not to be used for clearing ice off the surface. That is not a preference or a judgment call. It is written into the instructions for all three products, and it is far easier to plan around before the crew is on the roof than after.
Choosing the Right Epilay Product
Our Epistik peel-and-stick line has three products, and all three offer ice dam protection, which is what most roofing contractors are buying for in a cold-weather market.
Epistik Ice & Water has a granulated surface and is built to take the place of older sand-surfaced peel-and-stick products. Epistik Plus has a light grey GripWalk top, and the light color is what keeps the surface cooler to work on. Epistik SA-250 has a textured blue top with its own high-traction walking surface.
What all three share is the same SBS adhesive, the split backing, a lifetime limited warranty, and a passing result for sealing around nails. What differs is the surface, how each one is built, and the details in each instruction sheet, which is where the comparison is worth making before the order goes in.
Go Into Winter Prepared
Cold-weather work rewards the roofing contractors who settle the details before the crew is standing on a frozen deck watching the light go. Which product is on the truck. What that product’s sheet actually asks for. Whether the deck is in the shape the instructions call for.
Our Epistik line is built to stay workable when the temperature drops, and everything behind it is written down rather than assumed. Visit epilay.com to compare the lineup and download the instructions for each product. For help matching a product to a specific job, contact us.
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