Self-built House Roof with Prefabricated Floor Slabs

Using prefabricated floor slabs for the roof of a self-built house has both advantages and disadvantages, and a careful choice should be made based on the actual situation.

Advantages

• Low cost: Prefabricated floor slabs have certain cost advantages. Compared to some other roofing materials and construction methods, their prices are more affordable, making them a relatively economical choice for self-built homeowners with limited budgets.
• Fast construction speed: Prefabricated floor slabs can be manufactured in advance in the factory. Once they arrive at the construction site, they can be hoisted and installed within a day or half a day, significantly shortening the construction period. This allows for faster completion of house construction and enables homeowners to move in sooner.

Disadvantages

• Joints prone to cracking: The joints between two floor slabs are the most vulnerable areas. Due to the potential difficulty in handling the joints, factors such as temperature changes and building settlement over long-term use can cause the joints to crack, affecting the overall integrity and stability of the roof.
• Prominent waterproofing issues: When it comes to waterproofing, using prefabricated floor slabs as the roof has a relatively high probability of water leakage. Many users who have used floor slabs as their roofs have been troubled by water leakage, which not only affects the indoor environment but may also cause damage to indoor decorations and items.
• Low earthquake resistance: Prefabricated floor slabs should not be used in earthquake-prone areas as their earthquake resistance coefficient is too low. In the event of an earthquake, they are prone to collapse, posing a serious threat to the lives of the occupants.
• Poor thermal insulation: The thickness of floor slabs is generally around 12 centimeters. Although they have a hollow structure, their thermal insulation performance is poor. In summer, the indoor temperature will be very high, making people feel stuffy and uncomfortable; in winter, the indoor temperature will be relatively low, requiring additional insulation measures. Generally, a secondary roofing material covering is needed on the floor slabs to make up for this defect.

Current situation and trends

With the development of construction technology, cast-in-place concrete and prefabricated buildings are gradually replacing traditional prefabricated panel houses. Existing prefabricated panel houses generally have problems such as weak earthquake resistance, poor sound and heat insulation, and a service life of about 30 - 50 years. Since 2022, China has implemented a policy of renovating old buildings, focusing on repairing and renovating prefabricated panel houses and only demolishing those that meet the criteria for dangerous buildings.