APP Membrane

The application methodology of APP (Atactic Polypropylene) membrane is a crucial process in waterproofing and protecting various structures, such as roofs and foundations, from moisture intrusion. 

The construction industry widely uses APP membranes in roofing because of their excellent waterproofing properties and durability.

Here’s an overview of the typical application methodology of APP membrane:

Surface Preparation

Thoroughly clean and prepare the surface before applying the APP membrane. This involves removing any dust, debris, or loose material from the substrate. It’s essential to have a clean and smooth surface to ensure proper adhesion of the membrane.

Primer Application

In some cases, we may apply a primer to enhance the adhesion of the APP membrane to the substrate. The type of primer used depends on the specific substrate material and conditions. The primer is typically allowed to dry before proceeding.

Heating and Torch Application

APP membranes are typically torch-applied. They have a bottom layer with a thermofusible film that, when heated, forms a strong bond with the substrate. Roofing professionals carefully heat the membrane with a propane torch as they roll it out onto the prepared surface. In torch-down roofing, operators heat the membrane and then press it onto the substrate to ensure proper adhesion.

Overlapping and Sealing

Overlap each roll of APP membrane with the adjacent roll to create a watertight seal. The overlap width depends on the manufacturer’s specifications but is typically around 3 inches (7.5 cm).

To ensure a secure bond between the overlapping sections, we use a roller or apply hand pressure.

Detail Work

We give special attention to details such as corners, penetrations (vents, pipes, etc.), and edges, where waterproofing is critical. To reinforce these areas and prevent water ingress, we may use additional membrane layers or flashing details.

Application Methodology of APP Membrane
Final Inspection

After applying the membrane, we conduct a final inspection to check for proper adhesion, seams, and details. Any defects or areas that require additional attention are addressed and corrected.

Protection Laye

For protecting the APP membrane from UV radiation, physical damage, and weathering, one may add a protection layer like gravel, pavers, or a reflective coating, depending on the application and specific project requirements.

For guidance on the application methodology of APP membrane, including the selection of appropriate materials and methods for specific projects, KJASons® is the go-to source. 

Our expertise in construction materials and waterproofing solutions makes them a trusted partner for addressing your waterproofing needs. 

Whether you have questions about membrane application techniques, or project specifications, or need to order waterproofing materials, KJASons® can provide the guidance and support you need for a successful waterproofing project.