How to Make the Roof of a Mobile Toilet

The roof of a mobile toilet is typically made using sandwich roof panels combined with waterproof membranes, and an eaves structure is designed to prevent rainwater intrusion. The specific production steps are as follows:

I. Material Selection and Preparation

1. Sandwich Roof Panels: Prioritize lightweight and high-strength materials, such as color-coated steel sandwich panels (with polystyrene or rock wool cores). These panels offer insulation, heat resistance, and structural stability, effectively reducing the roof's self-weight and adapting to mobile scenarios.
2. Waterproof Membranes: Use weather-resistant and aging-resistant materials, such as SBS modified bitumen waterproof membranes or PVC waterproof membranes, to ensure long-term waterproof performance when exposed to outdoor environments.
3. Eaves Structure Materials: Select color-coated steel or aluminum alloy profiles that match the sandwich roof panels. These materials must have deformation resistance to withstand wind pressure and rainwater scouring.
4. Auxiliary Materials: Include self-tapping screws, sealants, rivets, etc., used for fixing and sealing connection points to prevent leakage.

II. Roof Frame Construction

1. Main Beam Installation: Install galvanized steel pipes or square steel main beams on top of the mobile toilet's main frame according to the design dimensions. Ensure levelness and load-bearing capacity to provide stable support for the roof.
2. Secondary Beam Layout: Lay secondary beams (such as C-shaped steel) at intervals on the main beams to form a grid-like structure. The spacing should match the width of the sandwich roof panels, typically 1.2-1.5 meters, to distribute the roof load evenly.

III. Sandwich Roof Panel Installation and Fixing

1. Panel Installation: Start laying the sandwich roof panels from one end of the roof sequentially. Leave a 5-10mm expansion joint between panels and fix them to the secondary beams with self-tapping screws. Control the screw spacing at 200-300mm to ensure a secure connection.
2. Panel Joint Treatment: Fill sealant in the expansion joints to prevent rainwater penetration. Cover the joints between panels with special trim strips and fix them with rivets to enhance sealing.

IV. Waterproof Membrane Application

1. Base Layer Preparation: Clean the roof surface to ensure it is free of dust, oil, and sharp objects that could damage the waterproof layer.
2. Membrane Laying: Start laying the waterproof membrane from the lowest point of the roof, horizontally in the direction of drainage. Use hot-melt or self-adhesive methods for construction to ensure the membrane adheres tightly to the base layer without air bubbles or wrinkles.
3. Lap Joint Treatment: The longitudinal lap width of the membrane should be no less than 100mm, and the transverse lap width should be no less than 150mm. Seal the lap joints tightly with sealant to prevent leakage.

V. Eaves Structure Installation

1. Eaves Panel Fixing: Install eaves panels at the edge of the roof. The lower edge of the eaves panels should be lower than the lowest point of the roof to form a water drainage slope (typically 2%-5%) to ensure smooth rainwater discharge.
2. Sealing Treatment: Fill sealant in the joints between the eaves panels and the roof, and install waterproof covers at the corners to prevent rainwater backflow.

VI. Inspection and Maintenance

1. Waterproof Testing: After construction, conduct a water spray test for more than 2 hours to check for no leakage on the roof and eaves.
2. Regular Inspection: During use, regularly clean dust and debris from the roof, check for aging of sealants and fasteners, and promptly repair any damaged parts.