Container House Fillers

Common fillers used in container houses mainly include rock wool, air layers, foam boards, etc. Different fillers have different characteristics and are suitable for different scenarios.

Rock Wool

Some container houses adopt a three-layer composite structure for the enclosure, consisting of "rock wool - air layer - galvanized aluminum-zinc plate". The thickness of the rock wool layer is controlled between 75 mm and 100 mm, with its fiber orientation perpendicular to the heat flow path, limiting the thermal conductivity to below 0.040 W/(m·K). This structure reduces the risk of condensation caused by temperature differences between the inside and outside of the container in cold winter environments in Inner Mongolia, extending the service life of the steel structure. Additionally, rock wool sandwich panels used in residential containers, wrapped with iron sheets on the outside, offer Class A fire resistance, moisture and corrosion resistance, sound insulation, and thermal insulation, although they are relatively expensive.

Air Layer

In the three-layer composite structure of "rock wool - air layer - galvanized aluminum-zinc plate", the 5 mm air layer in the middle suppresses convective heat transfer through a closed cavity, keeping the overall heat transfer coefficient (U-value) below 0.5 W/(m²·K). Combined with the rock wool layer, it enhances the thermal insulation performance of the house.

Foam Board

Foam boards are also a common filler material for sandwich panels in residential containers, but their performance is slightly inferior to that of rock wool boards. Rock wool boards have advantages such as Class A fire resistance, so residential containers using rock wool boards are more than twice as expensive as those using foam boards.

Other Special Filling Scenarios

Some container houses address the thermal bridge effect of metal walls by filling hard polyurethane foam between the steel frame and interior wall panels and adding rubber thermal insulation pads at the frame connections. This reduces the heat exchange efficiency between the inside and outside of the container by about 40%, decreasing reliance on heating equipment and energy consumption.