Roof Surfaces

The Ultimate Guide to Precast Roof Surfaces with Waterproofing

The entire construction industry rests on the use of concrete, a reliable and effective material that offers a multitude of benefits, such as energy efficiency, fire-resistance, and design flexibility. However, it is impervious in nature and brittle; these traits are handled through the addition of steel bars and waterproofing membranes.

Regarding concrete structure types, components in precast roofing systems are developed in controlled conditions, offering better quality and performance. Precast elements include slabs, beams, double tees, etc.; these essentials provide greater freedom in savings and design. If you are interested in precast applications, connect with Lakhwa Chemical Services today!

What are Precast Systems?

Precast concrete is designed, organized, and formed to support structural and non-structural requirements. Various precast elements are used to design an attractive finish. Through this process, concrete floors, concrete walls, and concrete frames can be made. Precast construction is a costly and labor-intensive process: Clients demand high quality and performance from the makers.

Manufacturing Precast Concrete

Following is a simplified process of developing precast concrete structures:

  1. Concrete is poured into wooden or steel mold with wire or rebar.
  2. The curing process takes place in a controlled environment.
  3. After process completion, it is transported to the construction site.

Various additions can be made to the precast structure, such as choice of color, form, or texture, façade integration, meeting compatibility requirements, creating small structures to open spans, recycled or reused upon replacement or removal.


Types of Precast Concrete

  • Precast piles
  • Prestressed concrete
  • Caravista slab
  • Pocket footings
  • Reinforced concrete
  • Altos slab
  • Precast columns

Advantages of Precast Concrete

  1. High Profits, Scalable Business, and Quick ROI

Precast concrete offers attractive opportunities with a faster rate of investment. In other words, clients for residential, commercial, and industrial sectors can move in sooner. The construction rate also increases, building fast and efficient structures with reduced effort.

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  1. Sustainability

The use of materials and equipment is low compared to other methods. Precast construction, because of its batch-type process, uses limited resources: Less labor, less steel, and less water. Waste production is minimized, which reduces CO2 footprint than in cast-in-situ construction. Lastly, the working conditions are safer and more hygienic.

  1. Aesthetics

Precast structures, when finalized, generate a high appeal in all settings (residential, commercial, or industrial). Several combinations of colors and textures can be used. Moreover, a wide variety of shapes and sizes are also available.

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Precast Waterproofed Structures

Because of concrete’s porosity, waterproofing precast structures becomes necessary. Following is a simple process that aids in covering the structures with membranes.

  • Remove dirt, dust, and grease: Repair cracks or defects in the precast concrete.
  • Apply a premium-quality sealer or water repellant to the surface. It helps to fill capillaries or


  • Follow the manufacturer’s guidelines for the choice of sealer. The application process includes brushing, rolling, or spraying.
  • Install a waterproofing membrane over the precast surface. Liquid-applied and sheet membranes are mostly used. Liquid membranes are sprayed or rolled on the surface, whereas sheet membranes are applied with heat or adhesives.
  • When managing joints or seals, opt for appropriate sealants to prevent water penetration. Make sure that the joints are sealed to accommodate movement.
  • Install flashing around roof penetrations, such as pipes, vents, and chimneys. This process prevents water from penetrating surfaces.
  • The precast roof should have an adequate slope to facilitate water rundown. Ensure proper drainage to restrict water accumulation and leaks.
  • Clear the roof drains and gutters to avoid water pooling.
  • Inspect the waterproofing system for signs of wear or damage.
  • Address issues on a quick note. You can reapply sealants or coatings as needed.
  • If you face any issues, consult with experts from Lakhwa Chemical Services, the best precast roof company in Karachi, Pakistan.
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