Mobile home recycling also faces challenges and difficulties. First, discarded mobile homes may contain pollutants or hazardous materials, requiring proper treatment and cleaning to ensure environmental and human health safety. Second, the structure and design of mobile homes may not be suitable for reuse, necessitating modifications and adjustments to meet new requirements and standards. Moreover, establishing a comprehensive recycling system and market is needed for mobile home recycling to promote the development and promotion of the recycling industry.
Modular buildings are lightweight, constructed with steel frames connected by self-tapping screws and standardized components. The majority of the structure above the foundation is dry construction, allowing for strong adaptability to weather during on-site assembly. Consequently, the construction speed of modular buildings is approximately one-third of traditional buildings, with a construction period of around one-third of that of conventional buildings.

Activity houses are a new type of light steel composite panel houses, which, with a reasonable combination of materials and steel structures, can achieve excellent safety performance. Specifically, they can withstand earthquakes of over 7 levels and typhoons of up to 12 levels, which is something that typical houses struggle to do. Therefore, they are widely used in earthquake-stricken areas.

The waterproofing of prefabricated buildings mainly prevents situations such as floods, mudslides, landslides, and rain-induced electrical shorts. The primary protective measures lie in the selection, installation, and design of the prefabricated units.

The materials used in portable cabins are flame-retardant and meet fire safety standards. However, caution is still needed on construction sites due to the presence of many people. Especially during winter, pay close attention to the following points:
1. No open flames are allowed inside. This is a very dangerous practice.
2. Avoid using high-power appliances as much as possible, as it's extremely dangerous to have each worker's dormitory equipped with them on a construction site, especially if the wiring hasn't been reinforced.
3. Never litter cigarette butts, especially at night when sleeping. Be sure to extinguish them and dispose of them in the designated area.
4. As winter approaches, don't just shut your doors and windows tight because of the cold weather. After all, we're sharing rooms with a few others, we still need to ensure good indoor air circulation.
5. If the mobile home is constructed with foam-core panels, extra caution must be taken regarding fire and electrical safety.
The material for the roof of modular buildings is color steel plate, thus the color of the color steel plate determines the color of the modular building roof. Color steel plates are produced from cold-rolled steel sheets and galvanized steel sheets, which are then processed through surface treatment techniques. Manufacturers apply paint continuously to the base sheets, followed by drying and cooling. Typically, color steel plates undergo a two-coat-one-bake process during production to ensure the paint adheres stably to the base for an extended period. The reason for painting the base sheets is that the paint can isolate the base from oxygen and moisture in the air, thereby extending the lifespan of the color steel plate. Higher quality color steel plates ensure a more secure construction of modular buildings.