6 Best Tack Strips For Perimeter Securement Pros Use

Perimeter securement is the silent anchor of any low-slope roofing system. When the wind picks up, the edge is the first point of failure, often leading to progressive membrane peel-back that can compromise an entire building envelope. Choosing the right termination bar or securement strip isn’t just about code compliance; it is about providing the mechanical resistance necessary to keep the roof membrane locked in place. Whether working with EPDM, TPO, or PVC, the integrity of the perimeter often dictates the longevity of the installation.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Carlisle Sure-Seal Term Bar: Best Overall Choice

The Carlisle Sure-Seal Termination Bar is the industry workhorse for a reason. Its pre-punched, slotted holes accommodate thermal movement, which is critical when a roof membrane expands and contracts throughout the day. It provides a consistent, high-pressure seal that keeps the membrane from buckling under fluctuating temperatures.

When working on parapet walls or roof-to-wall transitions, the rigidity of this bar ensures the membrane stays perfectly flat against the substrate. This uniform pressure distribution is exactly what prevents the “fish-mouthing” that often leads to leaks. It is compatible with almost every major single-ply membrane, making it a reliable staple for any truck.

The bottom line is simple: use this when reliability is the priority and the specific project doesn’t call for a proprietary system from another manufacturer. It is a predictable, high-performance product that rarely surprises a crew in the field.

GAF TPO Coated Metal: Best for Heat Weld Tie-Ins

GAF TPO Coated Metal acts as a bridge between the roof deck and the membrane. Because the metal is factory-coated with a layer of TPO, it allows for a direct, chemical heat-weld of the roof membrane to the edge metal itself. This eliminates the need for mechanical termination bars in certain edge-securement details.

This system is ideal for projects requiring a clean, monolithic look at the drip edge or gravel stop. By welding the membrane directly to the metal, the possibility of fasteners backing out or rubber gaskets failing over time is removed. It creates a seamless transition that is functionally superior to a standard termination bar in high-wind zones.

However, heat welding requires a high level of skill. If the heat gun setting is off or the seam is not properly rolled, the bond will be compromised. Stick to this choice when the crew is experienced with heat-welding techniques and the project design prioritizes a high-end, weather-tight edge.

Firestone R.M.A. Strip: For Mechanically Attached

The Firestone R.M.A. (Reinforced Membrane Attachment) Strip is engineered for specific mechanical securement needs. It is designed to distribute the stress of high-wind uplift across a wider footprint than a standard termination bar. By dispersing that force, it protects the membrane from tearing at the fastener points.

On roofs where the membrane is not fully adhered, this strip acts as a critical reinforcement against wind flutter. It is a common choice for projects where local building codes require enhanced edge securement beyond standard specifications. The reinforced construction provides extra rigidity that keeps the system tight even in aggressive coastal environments.

Always check the manufacturer’s specific fastener spacing requirements when using this strip. Because it is designed to bear significant load, failing to install it with the correct number of screws per foot will negate the structural benefits of the material.

Mule-Hide TPO Term Bar: A Top Contractor Value Pick

Mule-Hide offers a no-nonsense termination bar that excels in cost-effectiveness without sacrificing the durability required for standard commercial applications. It is lightweight, easy to cut on-site with a hacksaw, and installs quickly with standard fasteners. This makes it an excellent choice for budget-conscious projects that don’t need exotic features.

This bar is most effective on smaller flat roofs, residential roof-to-wall details, or repair work. While it lacks some of the proprietary bells and whistles of high-end, engineered bars, it does exactly what it is supposed to do: it compresses the membrane against the wall to create a clean, watertight seal.

Contractors often turn to this product because it is readily available and familiar to every crew member. For a straightforward job where the primary goal is a fast, reliable, and compliant termination, it is a difficult value to beat.

Johns Manville TPO T-Bar: Built for High Wind Uplift

The Johns Manville TPO T-Bar is a heavy-duty solution for buildings located in high-wind regions or where building codes demand elevated uplift ratings. The profile of this bar is designed to be exceptionally stiff, ensuring it does not bow or flex under extreme pressure. This is a critical factor when protecting roof edges on taller buildings or open sites where wind gusts can reach destructive speeds.

What sets this bar apart is its consistency under tension. It is designed to be paired with high-performance fasteners that resist pull-out, creating a comprehensive securement system that exceeds basic code requirements. For an installer, this means confidence that the perimeter will remain anchored regardless of what the weather throws at the building.

If the project is situated on a mountain ridge or an open field with no wind breaks, do not cut corners with lighter-gauge bars. Invest in a high-stiffness option like this to avoid a callback due to perimeter failure during the next major storm.

Versico Perimeter Strip: Most Versatile Option

Versico’s perimeter strip is engineered for those tricky transitions where standard bars just won’t fit perfectly. It features a design that allows for slight adjustments during installation, accommodating variances in substrate flatness. This flexibility is a massive time-saver when working with older masonry walls that may not be perfectly plumb.

This strip is widely compatible, making it a “go-to” for contractors who work across multiple membrane types. It minimizes the need to stock a dozen different specialized bars in the warehouse. Whether dealing with a simple parapet or a complex metal transition, the adaptability of this product is its greatest asset.

While it is versatile, it should not be considered a substitute for manufacturer-specific components when a warranty is on the line. Always confirm with the membrane manufacturer that the strip is approved for the specific assembly before committing to the install.

Term Bar vs. Coated Metal: Which One Do You Need?

The choice between a termination bar and coated metal usually boils down to the building’s aesthetic requirements and the desired method of attachment. A termination bar is a mechanical system; it relies on compression, a gasket, and fasteners to hold the membrane in place. It is easier to install and replace, but the fasteners are exposed, necessitating the use of a cover strip or sealant.

Coated metal is a chemical attachment system. It creates a fused, monolithic bond that is superior for waterproofing, but it requires the crew to be proficient with heat-welders and automated rolling tools. It is cleaner in appearance because it eliminates visible hardware, but the metal itself must be custom-bent for the job, which adds to the lead time and material cost.

Use a termination bar for general repairs, retrofits, and jobs where a quick installation is prioritized. Reserve coated metal for new construction or high-end re-roofs where a seamless, maintenance-free edge is the project’s primary objective.

Fastener Spacing: Getting Perimeter Securement Right

Fastener spacing is the most ignored variable in perimeter securement, yet it is the primary reason for edge blow-offs. Every manufacturer publishes a fastener pattern—often six or eight inches on center—that is tied to their specific wind-uplift testing. Ignoring these specs or spacing fasteners too far apart creates “weak links” that wind can exploit.

If a building is in a high-wind zone, the perimeter securement must often be reinforced. This might involve shortening the fastener spacing from twelve inches down to six, or adding a second row of securement. Always consult the job’s specific wind-load calculations rather than defaulting to “what worked on the last job.”

• Always use the manufacturer-approved fastener, as the length and thread design are calibrated for the pull-out strength of the deck.
• Avoid over-driving the fasteners, which can strip the material and weaken the grip on the membrane.
• Ensure the fasteners are driven into the structural substrate, not just a layer of insulation or wood blocking that may be prone to rotting.

Don’t Forget Water Block: A Critical Final Step

A termination bar is only as good as the water block sealant tucked behind it. This sealant is the primary barrier that prevents water from wicking behind the membrane and into the substrate, where it can rot wood or corrode metal. Installing a termination bar without a heavy bead of water block is essentially leaving the door open for moisture.

When applying the sealant, ensure the surface is clean, dry, and free of dust. Use a generous, continuous bead along the top edge of the membrane before fastening the bar down. As the bar is tightened, the sealant should squeeze out slightly, creating a secondary “weep” seal that confirms a complete air and water stop.

Never rely on the bar’s integrated gasket alone; it will compress and potentially dry out over time. The sealant is the secondary layer of defense that makes the installation professional-grade and ensures the long-term integrity of the edge.

Common Perimeter Failures and How to Avoid Them

The most common failure in perimeter securement is “oil canning” or bowing of the metal edge, which allows the membrane to peel away from the wall. This is usually caused by using a bar that is too thin or failing to secure it into a solid, structural substrate. If the bar moves, the seal breaks, and wind gets behind the membrane.

Another failure is the use of incorrect fasteners. Using deck screws with too much thread pitch in masonry, or using common nails instead of high-pull-out-strength fasteners, will eventually lead to the system pulling loose. The perimeter is under constant stress from thermal expansion and contraction; it needs fasteners that can handle that cycle without vibrating loose.

• Audit the substrate: Ensure the wood blocking or concrete is solid before mounting the bar.
• Maintain proper gaps: Leave small gaps between sections of termination bars to allow for thermal expansion.
• Seal the tops: Always install a counter-flashing or a high-quality sealant over the top of the termination bar to prevent water from running behind the system.

A roof’s lifespan is defined by its weakest point, and that is almost always the perimeter edge. By selecting the appropriate termination bar, adhering strictly to fastener spacing protocols, and never skipping the sealant, the integrity of the roofing system is fundamentally secured. Whether the job calls for a high-performance, heat-welded metal or a robust mechanical bar, prioritize precision and material compatibility above all else. A well-executed perimeter isn’t just a finish; it is the primary defense against the next big storm.