Waterproofing Roof Deck: Polyurethane vs. Flexible Cementitious

Which is better for your roof deck: Polyurethane Waterproofing vs. Flexible Cementitious?

There's a reason why Polyurethane Waterproofing and Flexible Cementitious are some of the most widely used waterproofing systems in the Philippines today. So if you're still confused which system you are going to use for your roof deck, this one's is for you.

Before deciding which material you're going to install on your roof deck, you have to consider several factors first:

1. Design - Polyurethane waterproofing doesn't offer that much design options. Normally, it's only available in white and gray color. However, many manufacturers may also offer other colors for large orders. On the other hand, a flexible cementitious waterproofing can provide you the freedom to choose different designs because it is intended to be installed with a topping.

2. Installation - Of course, it's much easier to install a polyurethane waterproofing system. You just need to use a spreader or squeegee and roller to apply the Moisture Barrier and Polyurethane waterproof coating on your roof deck. On the other hand, you need to apply three layers when you choose flexible cementitious waterproofing system. Also, tiles are hard to install and requires professional tile setting skills.

3. Durability - Given that the flexible cementitious waterproofing system and tiles are installed properly, the system is slightly on the advantage when it comes to durability. On the other hand, if you're roof deck is only intended for light to medium foot traffic, a polyurethane waterproofing system is recommended as it can be used both as a coating and a waterproofing system.

4. Price - If you're on a budget, a polyurethane waterproofing system is best for waterproofing your rooftop. But, if you're willing to spend a significant amount on your roof deck waterproofing, a tiled roof deck is for you.

5. Maintenance - Obviously, it's much easier to maintain a tiled roof deck, especially when it is exposed to frequent foot traffic. On the other hand, it's harder to repair tiles that suffer from KAPAK or debonding. As for Polyurethane, damaged parts can be easily repaired by reapplication.

IMPORTANT TIPS:

- Waterproofing your parapet walls is crucial to complete the system. Otherwise, the entire system can be damaged due to the seepage of water inside the parapet walls. For this, a waterproofing paint is not recommended. You need a SAPAL RTU, a waterproof primer and sealer that can also be used a paint for exterior walls. It is a high-performance, UV-resistant, water-based acrylic coating. It cures into a tough elastic film that can withstand severe expansion and contraction movements. SAPAL RTU possesses outstanding durability, elasticity, and crack-bridging capabilities.

- Don't forget to waterproof the corner joints using a plugging mortar. For this, we recommend LEAKPLUG, an ultra rapid-setting plugging mortar specially designed for sealing corner joints and other cementitious areas that suffer from leaks. It is recommended to use prior to application of the waterproofing membrane. Upon setting, the product develops excellent structural strength (3000 psi) and excellent watertight properties.

- Protect protruding metal fixtures against corrosion. If the metals are intended to be used after some time, they should be protected using RED OXIDE, a rust-inhibitor used for the protection of steel exposed to relatively mild environments. It's an alkyd-based rust-inhibiting primer for interior and exterior metal works. It is an economical primer for iron and mild steel structures.

- Seal the gaps around pipers and metals using a hybrid sealant that can withstand weather and movements. For this, we recommend Handy Fix, a sealant based on modified silicone that has the required adhesion and tensile strength for bonding PVC and concrete. It is a multi-purpose adhesive and sealant with a rubber-like, flexible properties. Handy Fix is ideal for bonding the most common construction material, such as metals, plastics, timber, ceramic, concrete, mortar, glass, mirror, and other inorganic materials.
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Handy Fix - https://bit.ly/3u1nG9Z / https://bit.ly/3ntFx78
Sapal RTU - https://bit.ly/3vUKbPu​ / https://bit.ly/3xipZqz
Red Oxide: https://bit.ly/3kxFUxL / https://bit.ly/2XFqoqj
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