2025-08-26 15:42:03

6 Determining Factors Behind Waterproofing with Membranes

Heavy rains and storm and hurricane seasons are part of Puerto Rico's climate. Therefore, a well-sealed roof is an indisputable necessity. Many spaces on the island have experienced structural problems caused by roof leaks and other types of water-related damage.

The difference between a protected property and a vulnerable one lies in the quality of its roof sealing. Asphalt membranes are an effective and durable waterproofing system specifically designed for tropical climates. They outperform market alternatives like acrylic sealers, which lack the necessary flexibility to adapt to the changing conditions of roofs in the region.

Let’s explore the factors that make a roof seal last for years.

1. Professional roof assessment

The first step for a durable roof sealing system is a professional assessment. This process should not be underestimated, as it determines the life expectancy of the entire roof waterproofing.

A certified roofing contractor typically conducts a roof walkthrough, documenting its condition through photographs and measurements. This inspection includes reviewing the existing membrane, surface firmness tests, and slope evaluation to determine proper drainage.

The most frequent problems spotted during these project inspections usually involve areas with ponding water. Surfaces deteriorated by sun exposure, cracks in walls and joints, and separations in areas like drains and wall connections are also common.

Before applying waterproofing membranes for roofs, it's key to correct these underlying problems. Repairs range from surface leveling to eliminate ponding water, sealing structural cracks, and repairing deteriorated joints. Without these corrections, even the highest quality SBS or APP membranes can fail prematurely. An evaluated roof provides the optimal foundation to maximize the Danosa Caribbean asphalt waterproofing system.

2. Appropriate membrane selection

Choosing the ideal type of membrane contributes to the effectiveness of your roof waterproofing. Asphalt membranes are the most reliable option for the specific needs of our climate. In Puerto Rico, SBS (Styrene-Butadiene-Styrene) membranes are simply preferred for their elasticity and memory capacity.

These asphalt membranes have the property of stretching and returning to their original shape, adapting to structural movements and common temperature changes. Their installation can be done with torch, self-adhesive, or cold application, depending on the manufacturer's requirements.

On the other hand, APP (Atactic Polypropylene) membranes stand out for their resistance to high temperatures and aging from intense solar exposure. These waterproofing membranes have excellent performance in structures with direct solar exposure. Quality differentiators in waterproofing membranes are internal reinforcement (polyester or fiberglass) and reflective aluminum or white finishes that reduce interior temperature in both residential and commercial projects.

Unlike acrylic waterproofing sealers, which require frequent reapplications, quality asphalt membranes give you the peace of mind of protection for 8-30 years, depending on the system and maintenance. Additionally, their thickness adds extra thermal protection, contributing to energy savings.

3. Contractor experience and certification

The quality of a system depends not only on the waterproofing material, but also on who installs it. Working with certified roofers is as important as choosing the right membrane.

When looking for a contractor to install asphalt membranes, consider verifying current certifications from manufacturers. Then confirm licenses and insurance, and examine track records. Aim for a contractor who has +5 years of experience in waterproofing with asphalt membrane systems.

To evaluate the professional experience with waterproofing membranes, you can ask...

"What type of system do you recommend for my roof?"
"Could I see photos of previous work on other roofs?"
"How does the inspection of my roof's current condition work?"

Professional installation is a requirement to activate product warranties for the waterproofing systems we manufacture. Manufacturers like Danosa Caribbean offer warranties of 5 to 20 years, but these are only valid when installation is done by a certified contractor who follows established protocols.

These warranties may include inspections by manufacturer personnel.

Remember that the difference between a roof that resists a category 5 hurricane and one that can fail during the first strong storm lies in quality material and the certified roofing contractor who installs it.

4. Official product warranties

A fundamental aspect in any waterproofing project is warranties. Quality asphalt membranes come backed by warranties. Each with specific scopes. There are product warranties that cover manufacturing defects, waterproofing warranties that ensure the system's main function normally provided by contractors.

In Danosa's case, our materials include product warranties of 5 years for single-layer systems (e.g., Glasdan AL-80-4), 10-year warranties for double-layer systems (e.g., Esterdan R-36 + Glasdan layer), and extended warranties of up to 20 years for higher protection combinations.

The warranties’ duration for waterproofing systems depends on several factors. The main one is the installed system: multilayer systems offer more extensive warranties than single-layer applications. The type of building and its use, substrate preparation, installation protocols, and documented annual maintenance also influence. The presence of areas with ponding water may reduce warranty coverage if not corrected.

5. Transparent budget

Every budget for waterproofing with modified membranes should break down several things.

It should specify materials, indicating brands, models, and exact quantities, from base membranes to top layers. It must include surface preparation costs, such as crack repairs, leveling to eliminate areas with ponding water, joint treatment, and any other details.

They also need to clarify labor costs, separating basic installation, work in complex areas like drains and penetrations, and application of details like flashings and terminations. It's key to include specialized equipment costs, removal of old materials if applicable, permits, corresponding warranty, payment schedule, and conditions for possible extra costs.

Initially, quality membranes may represent a larger investment, but long-term cost-benefit analysis demonstrates their economic advantage. Premium asphalt membranes have a useful life of 15-30 years, compared to 2-4 years for solutions like acrylic sealers.

This means that while a quality membrane may cost between $3-$10 per square foot installed, its annual cost ends up being lower than alternatives that require frequent reapplications.

Additionally, membranes with reflective finishes generate savings in air conditioning costs because they reduce interior space temperature. But the most important added value is peace of mind and prevention during heavy weather events that could cost thousands of dollars in repairs.

Financing for roof sealing systems by COOPCIAPR

To make roof protection happen, there’s financing options for roof sealing in Puerto Rico.

The College of Engineers and Surveyors of Puerto Rico (CIAPR) in collaboration with Danosa offers a financing program through COOPCIAPR. This program allows access to up to $15,000 to cover roof sealing with flexible terms according to the financed amount: up to $5,000 in 60 months, between $5,001 and $10,000 in 72 months, and between $10,001 and $15,000 in 84 months. All at an interest rate of 7.50%.

Normally, certified roofing contractors from the Danosa Caribbean network that we refer share with prospects this financing option, facilitating access to high-quality waterproofing for more homes and businesses. To consult specific information about the availability of this financing option, we suggest asking for details from the contractor in charge of your roof inspection or directly from COOPCIAPR.

6. Superior material quality

The quality of materials significantly defines the durability of any waterproofing system.

Asphalt membrane characteristics:

Polyester reinforcements. Provide dimensional stability and tensile strength.
Flexibility. Maintain elasticity even at low temperatures, adapting without cracking.
Multilayer systems. The Esterdan R-36/Glasdan combination offers protective redundancy.
Extreme resistance. Capacity to withstand winds of more than 180 mph.
UV protection. Contain stabilizers and antioxidants against our intense solar radiation.

Reflective membrane benefits:

High reflectivity. Products like Glasdan AL 80 reflect ~80% of UV radiation.
Sustainability. LEED certifications and reduce urban heat island effect.
Greater durability. Experience less thermal stress = longer useful life.
Thermal control. Reduce interior temperature between 18°F and 54°F.
Energy savings. Decrease consumption in air conditioning.

Important certifications:

FM (Factory Mutual). Evaluates resistance to fire, strong winds, and hail damage.
Miami-Dade County. Certifies resistance to impacts and hurricane winds.
UL (Underwriters Laboratories). Verifies safety and consistent performance.
CRRC (Cool Roof Rating Council). Measures reflective and emissive properties.

Don't wait to see leaks, humidity, and ponding water. When these problems are visible, damage is already occurring and multiplies costs. Preventive waterproofing is the most economical strategy.

Reach out to a certified roofing contractor from Danosa Caribbean’s network for a roof inspection.