Analysis of lgs house heat preservation

I. Structural design and heat preservation principle

• Air layer heat insulation

Light steel keel house usually adopts double or multi-layer structure design, blocking heat transfer through the air layer, 

combined with the closed light steel keel frame to form a continuous heat preservation layer, significantly reducing heat loss.

• Bridge Breaking Treatment

Setting heat insulation gaskets between keel and inner and outer wall boards or adopting bridge-breaking connection technology, 

avoiding direct contact of metal structure leading to thermal bridge effect and ensuring the continuity of the heat preservation layer.

II. the performance of thermal insulation materials

• Mainstream material selection

Polyurethane foam (PU): 

Low thermal conductivity (about 0.022 W/m-K), on-site foaming to fill the gaps, to achieve no cold bridge insulation.

Glass wool/rock wool: 

Thermal conductivity of about 0.035-0.045 W/m-K, excellent fire performance (Class A non-combustible materials), commonly used in walls and roof interlayers.

Polystyrene foam (EPS/XPS): 

Lower cost (thermal conductivity of about 0.030-0.040 W/m-K), suitable for floor insulation.

• Thickness and Effectiveness

The thickness of the insulation layer is usually 80-150mm, and can be thickened to more than 200mm in cold areas, 

with double-layer insulating glass (heat transfer coefficient ≤ 1.5 W/m²-K), the overall energy-saving rate of up to 60% -75%.

Third, the actual application effect

In the northern winter (-20℃ environment), the temperature difference can be maintained at 8-10℃ when there is no indoor heating, 

and the room temperature can be stabilized above 20℃ with the floor heating or air conditioning system.

Hot and humid areas (such as 35 ℃ in summer) through the external sunshade + thermal insulation layer, the indoor temperature is lower than the outdoor 5-8 ℃, 

air conditioning energy consumption is reduced by 30% -40%.

IV. Precautions

Construction quality: 

Need to strictly check the insulation material filling compactness, to avoid hollow drum or joints leakage of heat.

Moisture treatment: 

Waterproof breathable membrane needs to be set on the outside of the insulation layer to prevent water vapor intrusion leading to material performance degradation.

Summarize: 

lgs house through multi-layer structural design + high-performance insulation materials, can achieve better than the traditional brick-concrete building warmth, 

but need to pay attention to the construction details and materials matching.