El Barro, las Manos, la Casa Jorge Belanko. 53min

How to Build Earthquake-Resistant Structures

Foundation Preparation

• The construction begins with marking the house layout on the ground using a rake tied with a ribbon, indicating the width of the foundation.

• Excavation is performed to reach at least 50 cm deep, ensuring it surpasses the organic layer for stability. The trench should be one and a half times wider than the wall.

• A drainage system is established within the trench to prevent water accumulation that could lead to structural issues.

Anti-Seismic Construction Techniques

• Two rows of plastic bags filled with clean gravel are used as part of the foundation, preventing moisture rise through capillarity.

• These bags help absorb horizontal seismic movements, reducing transmission of forces to walls. They should be interlocked and secured with barbed wire for stability.

• A concrete chain beam is placed on top of these bags, incorporating three 6 mm steel rods for even weight distribution and structural integrity in seismic zones.

Structural Design Considerations

• Alternative foundation methods include using compacted gravel-filled covers topped by chain beams or directly constructing walls from them.

• To enhance stability against earthquakes, structures should avoid rectangular shapes; circular designs are optimal due to their inherent strength against lateral forces.

Material Application Techniques

• When joining dry and wet materials (like mud and straw), it's essential to moisten them adequately for proper adhesion during construction.

• The application method involves layering material without smoothing it out excessively, allowing for better bonding between layers.

Arch Construction Methodology

• Arches are utilized in building lintels without industrial materials like iron or cement. This approach enhances aesthetics while maintaining structural integrity.

• A mold (cimbra) can be created from various materials (bricks, adobe, wood), ensuring balanced weight distribution during arch formation.

Ensuring Structural Cohesion

• An upper chain beam encircles all walls—both exterior and interior—to maintain cohesion during seismic events. This prevents walls from collapsing outward under stress.

• Natural materials such as willow branches mixed with clay provide flexibility and strength; they must be harvested shortly before use for optimal performance.

This structured approach ensures that buildings remain resilient in earthquake-prone areas while utilizing sustainable practices throughout construction.

Construction Techniques Using Clay and Straw

Creating a Strong Wall Structure

• The process involves twisting long straw into a continuous rope-like structure saturated with clay, ensuring it has the right consistency for strength.

• A mixture of one part clay and one part coarse sand is used, with fibers aligned parallel to the wall to enhance resistance against compression.

• The wall thickness reaches approximately 25 cm, creating a strong yet flexible structure without needing independent support beams.

• Despite some external wooden supports required for architectural approval, the natural construction method does not necessitate them for structural integrity.

• An example from Yemen illustrates that structures can be built high using just earth materials without cement, showcasing effective engineering principles.

Preparing Walls for Plastering

• Before applying plaster on walls rich in straw, a special primer containing ample clay is necessary to ensure adhesion.

• A thick layer of plaster (about 3 cm) is applied first to even out irregularities before adding finer layers; this enhances durability and stability.

• The initial layer should be rich in clay regardless of the underlying material (e.g., concrete or bricks), as it serves as an essential bonding agent.

Advantages of Earth-Based Construction

• Building with earth materials like clay and straw offers thermal insulation benefits, maintaining temperature effectively within structures.

• Recycled materials such as old nails and wires are utilized to anchor the mud firmly onto corners, enhancing structural stability during drying.

Techniques for Effective Bonding

• To prevent detachment of plaster from edges, small nails or sticks are embedded into the mud; round branches provide better anchoring due to their shape.

• The first layer must be rich in clay across all surfaces to ensure proper adhesion; subsequent layers can vary in composition but should maintain good bonding properties.

Enhancing Durability and Insulation

• A final layer made from fermented horse manure mixed with clay improves waterproofing and thermal inertia of the plastered surface.

• Proper foundation techniques involve placing stones beneath walls to prevent moisture damage while allowing walls to achieve significant thickness over time.

This structured approach highlights key insights into traditional building methods using natural materials while emphasizing practical applications and advantages.

Construction Techniques for Natural Building

Importance of Structural Elements

• The process begins with removing decayed wood to prevent further deterioration, followed by placing stones to block moisture from the ground.

• A technique called "pata de elefante" is introduced, which helps protect walls from water splashes and enhances foundation stability during seismic activity.

• The width and height of the "pata de elefante" are typically between 40 to 50 cm, providing a solid base that supports walls inwardly.

Layering for Moisture Control

• A trench is dug about 15-20 cm deep to ensure proper drainage and prevent erosion; this layer is crucial for maintaining structural integrity.

• The first layer consists of clay, sand, and straw placed above stones to keep moisture at bay while allowing air circulation.

Protecting Against Weather Conditions

• To combat freezing temperatures after heavy rains, joints between stones are filled with sand and Portland cement to prevent damage from frost.

• A foundational layer of gravel (10-12 cm thick) is laid down as it prevents moisture from rising through capillary action.

Vapor Barriers and Insulation

• A polyethylene vapor barrier is installed over the gravel layer to stop any potential vapor rise; this can be omitted in very dry areas.

• Above the vapor barrier, an organic thermal insulator made primarily of oat straw mixed with sawdust is added for enhanced insulation properties.

Construction Techniques for Walls

• The insulating material must have double the volume compared to clay and sand mixtures; its sponginess aids in thermal insulation.

• When constructing shelves or niches in walls, flexible materials like willow branches are used as support structures that allow tension distribution.

Final Touches in Natural Building

• As layers of mud are applied, they should adhere well due to proper moisture content; successive layers build up until desired thickness is achieved.

• An old tradition involves placing a bottle containing names of all contributors within the structure as a symbolic gesture during natural building projects.

How to Prepare and Apply a Durable Plastering Mixture

Ingredients and Preparation of the Mixture

• The mixture involves horse manure, which initiates putrefaction, creating a thick paste that enhances resistance to rain. This process takes about 10 to 15 days.

• A cooked paste is made using two cups of powdered milk and one cup of linseed oil, providing waterproofing and flexibility essential for temperature changes. Adjustments may be needed based on sand granularity.

• To avoid lumps, flour must be dissolved in cold water before boiling; hot water causes clumping. The goal is a thick but transparent slurry with added coarse salt for slower drying, enhancing hardness.

Application Techniques

• Before applying the plaster, wet the wall thoroughly to ensure proper adhesion of the new layer over the previous coat. Use strong tools like spoons or trowels for penetration into wall pores.

• Aim for an even surface when applying a second layer after the first has adhered well; this should be approximately 3 to 4 mm thick. Adjustments can be made with a trowel as it begins to dry slightly.

• If small cracks appear during drying, they can be smoothed out with felt or damp cloths for finishing touches that seal pores effectively without compromising strength.

Addressing Cracks and Final Touches

• Cracking may occur due to material contraction as it dries; these can often be remedied by applying a thin layer of additional material once fully dried to fill gaps without weakening the structure.

• Paint used should ideally be clay-based, allowing minor cracks to blend seamlessly into the finish while maintaining structural integrity beneath it.

Considerations on Material Choices

• Adding cement increases water absorption in plaster compared to non-cement mixtures; however, it provides better durability against moisture intrusion depending on environmental conditions. Careful assessment is necessary based on wall type and climate factors.

• For ceramic installation over clay-sand mixtures, allow adequate drying time (10–12 days) unless cement is added (10%); this accelerates hardening enough for early tile placement while managing residual moisture effectively through joints between tiles.

Longevity and Maintenance of Structures

• Industrial roofs typically last 30–35 years before needing repairs at high costs; conversely, well-made green roofs can endure hundreds of years with minimal maintenance despite being slightly more expensive initially (5–10%). Proper materials are crucial for longevity without industrialization except for polyethylene use in construction processes like grass layers or gravel support structures.

Construction Techniques for Sustainable Roofs

Layering Materials for Effective Drainage

• A fine filter (100 microns) is recommended to prevent wood from getting wet, followed by a polyethylene layer (200 microns) and grass sod on top.

• An alternative method involves using barrels to collect rainwater, with grass tiles cut to about 5-6 cm thickness placed like tiles on the roof.

Plant Integration and Protection

• Small plants can be added as their roots intertwine, forming a cohesive layer that helps protect the underlying materials.

• It’s beneficial to use rock gardens or similar plants on top of polyethylene to shield it from damage.

Paint Composition for Durability

• A specific paint recipe includes clay in cream form, hydraulic lime, whey (containing casein), salt for slow drying, and linseed oil for flexibility and water resistance.

• Fine sand or silt should be added to ensure good adhesion of the paint; its primary function is to waterproof walls while allowing them to breathe.

Color Application Techniques

• Red or yellow hues can be achieved using ferrite (iron oxide), which should be diluted in hot water and mixed thoroughly without lumps.

• Avoid latex materials as they seal pores completely, preventing wall respiration.

Cultural Reflections Through Music

• The transcript features musical interludes reflecting themes of nostalgia and continuity in cultural heritage.