Illustration of Container House Roof Structure

The illustration of container house roof structures requires design differentiation based on specific uses. There are significant differences in roof structures between traditional shipping containers, expanded residential container houses, and green roofs. Below is an analysis of key structures:

Traditional Container Roof Structure
The roof of a standard shipping container is a "skin structure" composed of a roof panel and a frame. The roof panel is made of 2.0mm thick corrugated steel plate, which enhances overall stiffness through its corrugated shape and directly bears environmental loads such as wind and rain. However, its original design was solely for supporting the stacking of other containers and did not consider additional loads (such as human activity or equipment installation). The frame consists of steel components such as top side rails and corner posts. The roof panel and frame are fixed together through welding or riveting, forming a closed load-bearing system. This type of structure is simple but has limited load-bearing capacity. If used directly for residential purposes or with additional equipment, structural reinforcement is required.

Upgraded Roof Structure for Expanded Residential Container Houses
Modern expanded residential container houses adopt a multi-layer composite design to enhance living comfort and safety. The core structure includes:

1. Load-Bearing Layer: Steel beams or wooden frames are added above the original container roof panel to form a secondary load-bearing framework, distributing roof loads to the corner posts and avoiding local stress concentration. For example, a green roof requires steel beams to transfer the weight of soil and plants to the container corner posts to ensure structural stability.
2. Functional Layer: A ceiling (decorative surface layer), insulation layer (such as polystyrene board or rock wool), and waterproof membrane (such as PVC or TPO) are laid in sequence, forming an integrated "insulation-waterproof-decoration" system. Some designs also incorporate a soundproof layer to enhance the living experience.
3. Connection Layer: The newly added structure is fixed to the original container frame through bolts or welding to ensure overall coordinated load-bearing. For example, the connection between steel beams and top side rails must meet seismic requirements to avoid loosening.

Layered Structure of Green Roofs
If a green roof is to be added to a container roof, a "sandwich-style" layered design should be adopted, with the following layers from bottom to top:

1. Waterproof Membrane: Made of root-resistant materials such as EPDM or TPO to prevent plant roots from damaging the roof structure.
2. Root Barrier: Copper foil or special root-resistant boards are laid to further isolate the roots from the waterproof layer.
3. Drainage Layer: Gravel is filled or a special drainage mat is laid to prevent water accumulation and roof overload.
4. Filter Fabric: Prevent soil particles from clogging the drainage layer and maintain smooth drainage.
5. Lightweight Soil: Special planting soil with a bulk density of ≤800kg/m³ is selected to reduce roof loads.
6. Plant Layer: Shallow-rooted, drought-tolerant plants (such as Sedum lineare) are chosen to reduce maintenance costs.

Suggestions for Obtaining Illustrations
For specific structural illustrations (such as frame joints, corrugated plate connections, and reinforced steel beam layouts), refer to professional books on container architecture (such as "Container Architecture Design and Construction") or structural engineering drawings to ensure designs comply with regulatory requirements.