Bangkok: Social media is circulating with advice that when extending an existing house, such as adding a kitchen or living room, it's always necessary to use pile foundations. According to Thai News Agency, this claim has been examined, and the necessity of using pile foundations depends on several factors, including soil conditions and the existing structure of the house.
Verified with Assistant Professor Somkiat Kwanphruek, a lecturer in the Department of Civil Engineering at King Mongkut's Institute of Technology Ladkrabang, it is concluded that site conditions are a crucial factor in deciding whether to use pile foundations. For instance, in areas with soft soil, such as Bangkok, piles are necessary for heavy extensions to prevent rapid settlement. Conversely, in regions with solid soil, like Nakhon Ratchasima or Chiang Mai, a spread footing might suffice if accurate load-bearing calculations are performed.
The selection of piles for home extensions is influenced by workspace, height, and vibration considerations. Common options include hexagonal piles suitable for small structures, dry process bored piles used where minimizing vibration is important, and micropiles for confined spaces.
Additionally, proper house extensions require adherence to key engineering principles to prevent cracks and subsidence. Matching pile lengths to those of the main house and ensuring structural isolation between the extension and the main house are critical steps. This approach avoids differential settlement and the costly repairs associated with foundation issues.
In conclusion, while pile foundations are not always necessary, investing in the right type of pile and structural design from the start is a worthwhile long-term option.