Yes, you can build a wall on soil, but it requires proper preparation and construction techniques to ensure stability and longevity.
Building a wall directly on soil without adequate foundation and drainage is likely to result in failure due to settling, frost heave, and water damage. Different types of walls require different considerations when built on soil.
Here's a breakdown:
- Foundation is Key: Brick and block walls require a solid foundation to distribute the weight and prevent settling. This typically involves a concrete footing that extends below the frost line.
- Drainage is Essential: All walls, regardless of material, need proper drainage to prevent water from accumulating behind them. This can be achieved through the use of a damp-proof membrane (DPM) and a gravel backfill.
Here are some general guidelines:
- Determine the Wall Type: Consider the type of wall you're building (retaining wall, garden wall, etc.) and the materials you'll be using (brick, block, timber, etc.). Each type has different requirements.
- Prepare the Soil: Excavate the soil to the required depth for the foundation or base.
- Foundation Construction (for brick/block walls): Pour a concrete footing that is wide and deep enough to support the wall's weight. The depth should be below the frost line in your area to prevent movement due to freezing and thawing.
- Base Construction (for timber sleeper walls): Lay down a base of gravel or hardcore for drainage. This will help prevent the timber from rotting.
- Damp-Proofing: Install a damp-proof membrane (DPM) behind the wall to prevent moisture from penetrating the wall structure.
- Backfill with Gravel: Backfill the area behind the wall with clean gravel to promote drainage.
- Drainage Outlets: Install weep holes or other drainage outlets at the bottom of the wall to allow water to escape.
In short, while directly placing bricks or blocks on bare soil is not advisable, you can build a durable wall on soil if you incorporate proper foundation, drainage, and damp-proofing measures.
