Prefabricated Slabs for Rural Houses in Guangdong

Prefabricated slabs were once widely used in rural houses in Guangdong, but they have both advantages and disadvantages, and some prefabricated slab houses may be included in renovation plans.

I. Application Characteristics of Prefabricated Slabs in Rural Houses in Guangdong
Prefabricated slabs were widely used for the roofs of self-built houses in rural areas of Guangdong due to their low cost and fast construction speed (lifting and installation can be completed in one day or half a day). Their advantages lie in shortening the construction period and reducing initial construction costs, making them suitable for rapid construction needs. However, the disadvantages are also significant:

1. Poor waterproof performance: Leakage problems are common, with eight out of ten houses potentially experiencing seepage, requiring frequent repairs or secondary coverage with waterproof materials.
2. Insufficient thermal insulation: The indoor temperature is high in summer and low in winter, necessitating the additional laying of thermal insulation layers (such as foam boards) or covering with roofing materials (such as tiles) for improvement.
3. Low earthquake resistance: The overall structural integrity is weak, making them unsuitable for earthquake-prone areas and posing safety hazards.

II. Damp-Proofing Measures
In response to the humid climate in Guangdong, some self-built houses adopt a design with an elevated damp-proof layer using prefabricated slabs:

1. Foundation construction: First, pour the ground beams, then build brick walls and reserve ventilation ducts to form an elevated layer.
2. Prefabricated slab laying: Place the prefabricated slabs on the elevated layer, utilizing air circulation to reduce the upward movement of ground moisture.
3. Reinforcement treatment: Some houses add steel mesh on the prefabricated slabs and pour concrete to enhance structural stability while improving waterproofing and load-bearing capacity.

III. Policies and Renovation Directions
According to the "15th Five-Year Plan for Urban Renewal," by 2030, 500,000 sets/units of dilapidated housing will be renovated, including prefabricated slab houses, with support for self-initiated updates or original-site reconstruction. However, renovation must meet the following conditions:

1. Housing safety appraisal: Only prefabricated slab houses classified as Grade C (partially dilapidated) or Grade D (wholly dilapidated) will be prioritized for inclusion in the renovation scope.
2. Renovation methods: Depending on the appraisal results, measures such as demolition and reconstruction, reinforcement and repair, or functional upgrades may be taken, specifically combined with local policies and financial support.

Summary: Rural prefabricated slab houses in Guangdong need to balance their economic benefits with their defects and extend their service life through damp-proofing, thermal insulation, and other improvement measures; if the house is appraised as dilapidated, one can pay attention to policy developments and apply for inclusion in the renovation plan to enhance safety and living quality.