APP (Atactic Polypropylene) membrane is a type of modified bitumen roofing material that is commonly used in building construction. It is a type of asphalt-based membrane that has been modified with plasticizers, making it more flexible and durable than traditional asphalt roofing. APP membrane is typically used as a waterproofing material for flat or low-sloped roofs. It is installed by first applying a layer of asphalt primer to the roof surface, then torching the APP membrane onto the primer. The seams are then heated with a torch to melt the asphalt and create a watertight seal. Brick bat coba, on the other hand, is a traditional method of waterproofing flat roofs that are still used in some parts of India. It involves creating a layer of mortar made from cement and sand, and embedding pieces of broken bricks, called "brickbats," into the mortar. The brickbats are laid out in a grid pattern to create channels for water to flow away from the roof. The brick bat coba method is a labor-intensive process and requires skilled workers to install it properly. It is also not as durable or long-lasting as modern roofing materials like APP membranes. However, it is still used in some regions where modern roofing materials are not readily available or affordable. APP membrane and brick bat coba are not typically used in the food industry. These materials are primarily used for waterproofing flats or low-sloped roofs in building construction. In the food industry, materials like stainless steel, plastic, and epoxy coatings are commonly used for surfaces that come into contact with food. These materials are selected for their durability, resistance to corrosion and chemical damage, ease of cleaning, and ability to meet sanitary standards. APP membrane and brick bat coba are not suitable for use in food processing or storage areas because they can be difficult to clean and may harbor bacteria or other contaminants. These materials are also not designed to withstand the harsh cleaning chemicals and high temperatures that are required to maintain food safety standards. In summary, while APP membrane and brick bat coba is useful for waterproofing roofs, they are not appropriate for use in the food industry. Food-grade materials that meet safety and sanitation standards are used instead. The design considerations for APP membrane and brick bat coba vary depending on the specific application and building conditions. However, some general design considerations for each material are: Design considerations for APP membrane: 1) Roof slope: APP membrane is best suited for flat or low-slope roofs, typically with a slope of 1/4 inch per foot or less. For slopes greater than this, alternative roofing materials may be more appropriate. 2) Climate: The APP membrane is suitable for use in a variety of climates, but the type of APP membrane used may need to be adjusted depending on the climate. In colder climates, a thicker and more flexible APP membrane may be needed to prevent cracking due to freezing and thawing cycles. 3) Roof deck: The roof deck should be strong enough to support the weight of the APP membrane and any foot traffic that may occur during installation or maintenance. 4) Roof penetrations: Any penetrations through the roof, such as pipes, vents, or skylights, should be properly flashed and sealed to prevent water infiltration. Design considerations for brick bat coba: 1) Roof slope: Brickbat coba is typically used on flat roofs with a slight slope to allow for water runoff. The slope should be at least 1:50. 2) Structural support: The roof structure should be strong enough to support the weight of the brick bat coba, which can be quite heavy. 3) Waterproofing layer: A waterproofing layer, such as a layer of asphalt or a waterproof membrane, should be installed beneath the brickbat coba to prevent water infiltration. 4) Thermal insulation: To reduce heat gain and loss through the roof, thermal insulation should be installed between the structural slab and the brickbat coba layer. 5) Drainage: A proper drainage system should be designed and installed to ensure that water flows away from the roof surface.
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