Q: What are the mainstream insulation combinations for galvanized steel sheet coated coils?
A: There are three main insulation core material combinations on the market, suitable for different scenarios:
**Economical Combination:** Coated steel sheet + EPS (polystyrene foam): Good insulation performance and lowest price, but poor fire resistance (usually B2 grade, combustible), unsuitable for places with high fire protection requirements.
**Comprehensive Performance Combination:** Coated steel sheet + PU/PIR (polyurethane): Excellent thermal insulation performance, achieving the same insulation effect with a thinner sheet, and a fire resistance rating of up to B1 (flame-retardant).
**Safety and Compliance Combination:** Coated steel sheet + rock wool/glass wool: Best fire resistance, classified as Class A non-combustible material. Also possesses excellent sound insulation performance.
Q: How should I choose among these different options?
A: The choice depends on your specific needs, requiring a balance between performance, safety, and cost:
Consider fire safety requirements: This is mandatory. If the project has strict fire safety regulations (such as in densely populated factories), you must choose Class A non-combustible materials such as rock wool. If there are no special requirements, PU or EPS can be chosen.
Consider insulation needs: For high requirements on workshop temperature control and energy efficiency, PU is recommended; for general needs, rock wool or thickened EPS is sufficient.
Consider your budget: The price order from lowest to highest is: EPS < PU < Rock wool.
Q: Besides sandwich panels, are there other more economical and effective alternatives?
A: Yes. In addition to using sandwich panels directly, there are two other common alternatives:
Adding reflective foil: Before installing the color steel panels, a layer of double-sided reflective foil is laid, which can significantly reflect solar radiation heat. This is a simple, economical, and effective method of heat insulation and cooling.
Using heat-insulating coating: Applying a special heat-insulating coating with high reflectivity to the surface of the color-coated steel coil can reflect most of the solar heat energy, effectively reducing the temperature of the roof and interior.
Q: What are the key points during construction that affect the final insulation effect?
A: Construction details are crucial; improper handling can create thermal bridges, significantly reducing the insulation effect. The following points should be noted:
**Insulation cotton must be laid tightly:** There should be no gaps between the insulation cotton. Any gaps must be repaired promptly; this is fundamental to ensuring the effectiveness of the insulation.
**Prevent the thermal bridging effect:** Heat can be lost along the joints of the metal keel or panels, forming thermal bridges. Therefore, thermal insulation pads should be placed between the keel and the panels, and sealed.
**Proper moisture control:** Once the insulation cotton becomes damp, its insulation performance will drop sharply. A moisture-proof board or moisture-proof layer must be installed under the color steel plate to prevent moisture condensation from corroding the insulation layer.
Q: What are some recommendations regarding the thickness of the surface layer and core material?
A: Yes. The steel plate thickness determines the structural strength, while the core material thickness determines the insulation performance. A proper combination of both is necessary.
Steel plate thickness (0.3mm - 0.8mm): For roofs and walls, 0.4mm - 0.5mm is a common choice, meeting the strength and durability requirements of ordinary factory buildings. For high load-bearing requirements (such as large factory buildings), 0.5mm or more should be selected.
Core material thickness (50mm - 150mm): For ordinary factory buildings, 75mm is recommended as a starting point. For high insulation requirements or in extremely cold regions, 100mm or even thicker can be used; 50mm can be selected for temporary buildings or in southern regions.