When it comes to waterproofing, the conversation often gets technical—fast.
Hot-applied vs. cold-applied systems. Membrane chemistry. Application layers. Cure times.

But on the jobsite, the decision usually comes down to something much simpler:

What works best for your conditions, your crew, and your schedule?

Let’s break it down into a straightforward, no-overthinking-required guide.

First, the Basics (Quickly)

At a high level, both systems are designed to do the same thing:

Create a monolithic, fully adhered waterproof barrier that protects the structure from water intrusion.

• Hot-applied systems (like RamTough 250) are heated on-site and applied as a fluid membrane that cools into a seamless layer
• Cold-applied systems (like Black Pearl®) are applied at ambient temperature and cure chemically into a durable, bonded membrane

Both work. Both perform.
The difference is how they get there—and what that means for your project.

Choose HOT-Applied If…

1. You Need Proven, Long-Term Performance in Demanding Conditions

Hot rubberized asphalt systems have decades of real-world performance behind them. They’re engineered for durability, even under ponded water and extreme temperature swings.

Best for:

• Plaza decks
• Green roofs
• High-traffic assemblies
• Projects where long-term reliability is the top priority

2. Your Project Has Complex Geometry or Heavy Detailing

Because hot-applied systems are fluid and seamless, they naturally conform to irregular surfaces, penetrations, and transitions.

Fewer seams mean fewer potential failure points.

3. You Have Time (and Equipment) on Your Side

Hot-applied systems require:

• Kettles or melters
• More installation steps and reinforcement layers
• Longer prep timelines (often requiring fully cured concrete)

Bottom line:
If your schedule allows for it—and your crew is set up for it—you get a robust, time-tested system.

Choose COLD-Applied If…

1. Schedule is Tight (or Phasing Matters)

Cold-applied systems dramatically reduce installation time:

• Faster prep
• No heating required
• Faster return to service

Some systems can even be applied to younger concrete, helping accelerate project timelines.

2. Jobsite Logistics Are Challenging

No kettles. No flames. No hauling hot material to elevated decks.

Cold-applied systems:

• Use smaller, easier-to-handle materials
• Reduce equipment needs
• Minimize safety risks tied to high heat

Best for:

• Tight urban jobsites
• Occupied buildings
• Projects with strict safety or fire restrictions

3. You Need Flexibility and Toughness During Construction

Cold-applied membranes are often highly elastomeric and resistant to jobsite abuse:

• Better resistance to abrasion and impact
• Strong crack-bridging capabilities
• Handles building movement and temperature swings

Ideal when:

• Trades are overlapping
• The membrane may see temporary exposure or traffic

The Reality: It’s Not Either/Or

Both systems create seamless, monolithic waterproofing layers—and both can be the right answer depending on the project.

At Barrett, systems like:

• RamTough 250 → hot-applied, seamless, built for long-term durability
• Black Pearl® → cold-applied, flexible, ideal for faster-moving jobs

…are designed to solve different jobsite challenges—not compete with each other.

The Simplest Way to Decide

If you’re still unsure, use this:

Choose HOT-applied if:

• You want maximum long-term durability
• The project allows for more setup and install time
• You’re working on large, complex, or high-risk assemblies

Choose COLD-applied if:

• You need speed and efficiency
• The jobsite has logistical or safety constraints
• You want flexibility and faster return to service

Final Thought: Don’t Overthink It

Waterproofing failures don’t usually come from choosing hot vs. cold.

They come from:

• Mismatching the system to the jobsite
• Overcomplicating installation
• Ignoring schedule and sequencing realities

The best system is the one that fits how the project will actually be built.

If you’re evaluating a project and want help narrowing it down, The Barrett Company can help guide you to the right system for your application.

For over seven decades, Ferrari has embodied a legacy of excellence, seamlessly blending tradition with cutting-edge innovation to deliver unmatched performance in the automotive world. This enduring commitment to precision and progress set the tone for the construction of its premier dealership in Long Island.

To ensure the structure met the highest standards of durability and design, especially in the critical area of roof waterproofing, developers turned to a company with an even longer history and a shared dedication toward innovation, performance, and enduring quality.

For the utmost performance and protection, Barrett recommended contractors utilize 120 mils of RamProof GC (Green Concrete) single-component, fluid-applied elastomeric rubberized asphalt roofing and waterproofing material for this 15,000 sq/ft application.

Topped with a Ram 306W white granular cap sheet, the resulting asphaltic-rubber membrane provides a fully adhered monolithic waterproofing system that is VOC-free, environmentally friendly, and LEED certified. And like that of a Ferrari, it guarantees performance, speed, and quality.

Parapets were coated with 60 mils of RamProof GC reinforced with PolyFelt 125VP polyester reinforcement fabric, followed by a second 60-mil coat of RamProof GC. Similarly, all drains were coated with 60 mils of RamProof GC reinforced with RamFlash 327 HDR uncured neoprene flashing, followed by a second 60-mil coat of RamProof GC overtop the neoprene.

Once fully adhered, the Ram 306 is covered with RamDrain DD-025 prefabricated dimpled drainage board, followed by a layer of insulation and a concrete slab. This assembly comes with a complete 20-Year Single-Source Warranty.

A national leader in the roofing and waterproofing industry since 1928, The Barrett Company has provided customers with hands-on experience and professionally engineered products. As with many before, Barrett’s advanced roofing and waterproofing systems proved integral to delivering a high-performance solution worthy of the Ferrari name.

NOTES FROM CRAIG:

• Reinforced all transitions 8” inches up the vertical and 8” on the horizontal (minimum reinforcing height is 3” up and 3” out).

• CONCRETE was poured over Ram 306 after application.

• Applicator wanted to bring the material up higher ending just below the final elevation once topping slab was poured (horizontal to vertical up the Parapet walls) 60 mils RPGC then embedded the Polyfelt 125 VP and applied an additional 60 mils of RPGC

• RamProof GC (120 mils)
  • Ram 306 W
  • Ram DD025 Dimpled Drainage Layer
  • Insulation
  • Topping Slab over Insulation

• Drains were reinforced with HDR 327 Uncured neoprene set in 60 mils of Ram Proof and applied another 60 mils on top of the neoprene.
  • 2 ft x 2 ft piece of neoprene tape
  • Set it over the drain
  • Star cut and push

• Field work was 120 mils of Ram Proof GC unreinforced with our 306 White Granulated Cap Sheet.

• 20-year warranty

When it comes to implementing green roofs into building design, the benefits can be EXTENSIVE (pun intended).

But with any sort of ecosystem, sustainability and performance is dependent upon the level of protection & care it is given.

Performing routine, preventative maintenance is essential for keeping your green roof healthy & ensuring those benefits continue.

When a green roof is complete, most of the waterproofing membrane is covered with engineered soil & vegetation, limiting any inspection of the membrane to the elements that are visible or easily accessible. All green roofs must be inspected at least twice a year, generally in early spring & late fall, separate and apart from vegetation maintenance.

Black Pearl® Cold Applied Rubberized Asphalt Waterproofing System requires less maintenance than most other types of membranes. Semi-annual, scheduled inspections are not only prudent, they are cost-effective and can save considerable expense in preserving the warranty protection and extending the life of the system well beyond the warranty period.

Green roof horticulture inspections will vary greatly from project to project depending upon the specific vegetation, depth of soil, weather conditions, irrigation, environmental conditions, and various other factors. Each project must be evaluated independently for the proper vegetation maintenance schedule. During the establishment period, a monthly inspection is generally sufficient for simple, basic, low-profile green roofs planted with sedum unless during drought periods. Drip irrigation systems will require less attention.

The following evaluation sequence is suggested for your maintenance personnel, professional maintenance services, or professional consultants for the membrane portion of the green roof.

Perimeters

Walk the perimeter of each deck and, to the extent possible, examine membrane base flashings, metal counter flashings, caulking sealants, termination bar and metal edging for mechanical damage. Even minor scrapes or punctures need to be properly repaired as soon as possible to prevent any progressive damage. Any loose metal must be re-attached properly, and all caulking must be maintained to prevent water entry around the flashing. If base flashings are bulging, check for water behind the flashing. Check masonry weeps. If water or masonry efflorescence (a whitish, chalky discoloration) is present on either side of the masonry, the source of the water entry must be determined and corrected as soon as possible.

Drains

Examine each drain and remove any debris that has collected around the drain. Ensure that drains are operative. On stone ballasted installations, keep larger stones around the drain strainer to help prevent clogging. Do not use any devices that will restrict water flow. Insure drain clamping ring is intact & tightly bolted to the sump.

Roof Surfaces

Roof surfaces should be always kept clean of debris. On stone ballasted surfaces, where the stone ballast has been displaced exposing the insulation or filter fabric, the stone and fabric must be put back into position. If stone ballast is consistently misplaced due to heavy traffic, such as near door openings or mechanical equipment, replace the stone ballast with concrete pavers.

This should also be done if building geometry and exposure results in localized stone “scrubbing” displacement from wind. Exposed filter fabric or insulation will deteriorate with direct exposure to ultraviolet rays. Inspect all concrete pavers and concrete wear slabs for signs of cracking, disintegration, or other types of breakage. If deterioration is occurring, determine the cause and institute corrective action as recommended by the manufacturer.

Penetrations

Inspect all roof top penetrations such as vent pipes, exhaust fans, skylights, AC units, etc., checking for flashing tightness to substrate, metal flashings, seams, caulking sealants, termination bars, clamping rings and other visible elements.

If a new penetration must be installed through the deck, or if there is an addition to the existing building, contact the Barrett Company for recommendations. Barrett requires that any modifications to the membrane be performed by a Barrett Approved Contractor with Barrett materials of like and kind. This is an absolute requirement if the membrane is covered by a Barrett warranty.

Repair Materials & Chemicals

All petroleum-based products and harsh chemicals should be kept off the system. Any cleaning material, solvent, animal fats, grease, some water chiller chemicals, oil, or material containing any petroleum by-product, may degrade the membrane or other components. Any time such a product comes into contact with the membrane or insulation, an inspection is required to ascertain if damage has occurred.

If the membrane comes into contact with any type of chemical, contact Barrett Company for advice, since some chemicals can degrade the membrane, insulation or fabric. Black Pearl® or Ram Mastic is recommended for emergency repairs. Do not use random petroleum-based roof products to make repairs to the membrane. Contact Barrett for emergency repair recommendations.

Click Here to download your own digital copy of the “Maintaining Black Pearl® Under Greenroof-Roofscapes®” reference guide.

Looking to hire one of our various Approved Applicators for your next project? Interested in applying to become a Barrett Approved Applicator? Click Here to learn more!

NOTE: All product literature (i.e. technical & safety data sheets, specifications, application instructions, etc.) is currently available to download from the “Resource Library” on our website. 

If you’ve visited any of the major US cities in recent years, there’s a good chance you may have spotted a new trend being adopted by many of its occupants; Green roofs. 

Whether commercial or residential, more and more buildings throughout our nation’s concrete jungles have begun embracing what many European countries have been doing for years. But why?

WHAT IS A GREEN ROOF?

A green roof system is an extension of the existing roof which involves (at a minimum) high quality water-proofing, root repellent system, drainage system, filter cloth, a lightweight growing medium, and plants. 

WHY GET A GREEN ROOF?

Conceptually, vegetative roofs can turn unused roof space into a park-like garden setting with a keen sensitivity to environmental enhancement. Barrett green roofs are designed around inter-dependent components which function as a natural planting habitat, creating new types of public and private spaces while restoring nature’s footprint on the built environment.

With due respect and integration of Feng Shui design principles, a green roof can be endowed with an indefinable quality providing serenity, balance, and harmony in otherwise lost space, all the while making important environmental contributions.

To make the decision that much easier, we’ve broken down the many benefits into a list: