Cement Boards or Fiber Cement
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Cement boards are composed of cement, reinforcing fibers, cellulose, and mica formed into thick sheets. They are durable, resistant to termites and rot, and require little maintenance once installed. Cement boards are installed with corrosion resistant fasteners and filled joints, and are being increasingly used in prefabricated homes in Nepal due to benefits like earthquake resistance, fire resistance, and reduced construction time and costs.
Cement Boards or Fiber Cement
- 1. CEMENT BOARDS OR FIBER CEMENT GROUP MEMEBERS AAYUSH DANGOL(069/B.ARCH/02) AASHISH PARAJULI(069/B.ARCH/05)
- 2. COMPOSITION • Combination of cement and reinforcing fibers formed into 4 foot by 8 foot sheets • 40-60% of cement, 20-30% of fibers, 8-10% of cellulose, 10-15% of mica • 1/4 to 1/2 inch thick that are typically used as a tile backing board
- 3. DURABILITY • They require very little maintenance once installed and painted • Compared to wooden siding, fiber cement is not susceptible to termites or rot
- 4. INSTALLATION • Cement board is hung with corrosion resistant screws or ring-shank nails • The boards are usually installed with a slight gap at joints in shower pans, bathtubs, and each other • Joints are then filled with silicone sealant or the manufacturer's taping compounds before applying a finish • The filled joints are taped like conventional gypsum board, but with fiberglass tapes
- 6. SCOPE IN THE CONTEXT OF NEPAL • Prefabricated homes are slowly but surely gaining popularity in the country • Introducing new techniques into house building has significantly reduced the stress and time required while enhanced numerous benefits • Light weight, earthquake and fire resistant and less time consuming to complete the structure are some of the salient features of prefabricated, often referred to as prefab, houses
- 7. CEMENT BOARDS USED IN INTERIOR FINISHING
- 8. CEMENT BOARDS IN BUILDING EXTERIOR
- 9. CEMENT BOARD USE IN NEPAL
- 10. ADVANTAGES • It has better long-term performance than paper-faced gypsum • Labor cost saving: fewer workers, and build more fast. • Sound insulation and absorption. • Fast & Easy installation: 5 times faster than traditional brick installation • It is highly resistant to absorbing moisture and has excellent drying properties
- 11. DISADVANTAGES • One major disadvantage of cement board is the weight per square foot • Due to its hardness, pre-drilling of fasteners is often recommended • Cement board is initially more expensive than water resistant gypsum board but may provide better long term value • Health & Safety - Appropriate health and safety precautions must be adhered to when working with this product
- 12. CONCLUSION • Cement boards significantly reduce the exterior maintenance required for your home • Possesses high durability, good dimensional stability, acoustic and thermal insulation properties and low production cost • Making use of it in the building reduces the stress to the foundation eventually reducing the cost and time. Hence it can replace the heavy bricks used as a major masonry unit in the building.
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