In construction, insulation and decorative materials are often used together. If they are incompatible, problems will arise before long. There are three common situations:
- Different materials expand and contract differently with temperature changes (that is, they have different coefficients of thermal expansion). For example, polystyrene boards have a large coefficient of thermal expansion, so they expand significantly when heated. If they are paired with metal decorative boards with a small coefficient of thermal expansion, the boards are prone to cracking and deformation when pulled together.
- Excessive water absorption causes problems: Some insulation materials (such as rock wool boards) are highly absorbent. If they are paired with decorative panels that are also highly absorbent (such as unwaterproofed stone), moisture will accumulate inside after rain. This will not only reduce the insulation effect but also cause the decorative panels to mold and fade.
- Strength mismatch can easily lead to damage: If the decorative panel is particularly strong (such as thick stone), but the insulation material is very soft (such as thin polystyrene board), even a slight external impact (such as wind blowing branches) will damage the insulation layer and affect the insulation effect; conversely, if the insulation layer is strong but the decorative panel is brittle, it will also break easily.
Considering the extremely thin nature of aerogel felt, its high hydrophobicity but susceptibility to powdering, low compressive strength, and potential thermal expansion and contraction due to temperature differences, selecting matching decorative materials is crucial . Below are several decorative materials and their combinations recommended based on their physical property compatibility:
1. Calcium silicate board/fiber cement board (preferred choice for wall decoration)
This is the most “golden” combination with aerogel felt in civil buildings.
- Matching logic :
- Synchronous thermal expansion and contraction : Calcium silicate board and aerogel are both inorganic substrates with relatively similar expansion coefficients, making it less prone to cracking of the surface due to alternating hot and cold temperatures.
- Strength compensation : Aerogel felt is very soft and easily deformed under pressure. Rigid calcium silicate boards provide a strong “outer shell” to protect the aerogel from impacts.
- Hydrophobic and breathable : Both have good breathability and can work together to prevent condensation buildup inside the wall.
- Installation Recommendation : Use a light steel keel structure, fill the keel with aerogel, hang calcium silicate boards on the outside, and finally apply anti-crack treatment to the board seams.
2. Aluminum single-panel/aluminum ceiling panels (industrial style and ceilings)
- Matching logic :
- Consistent water absorption : The aluminum sheet is completely non-absorbent, and the aerogel is extremely hydrophobic. This combination ensures extremely stable performance in humid environments (such as balconies and basements).
- Thermal stability : Although metal materials are greatly affected by thermal expansion and contraction, sufficient expansion and contraction space can be reserved for the internal aerogel by leaving gaps during installation (applying sealant) .
- Application scenarios : window frame edging, balcony ceiling.
3. Bamboo and wood fiber integrated wall panels/wood-plastic composite panels
- Matching logic :
- Dry construction : This type of material does not require cement mortar (aerogel is most susceptible to direct contact with water-based mortar), and is connected by snap-on panels, making the construction process dry and fast.
- Fault tolerance : The integrated wall panel itself has a certain hollow structure, which can buffer the slight pressure deformation of the internal aerogel felt.
- Points to note : Choose brands with good resistance to deformation to prevent wood-plastic composite materials from warping due to heat.
Comprehensive construction recommendations
- To prevent thermal shrinkage gaps : Aerogel felt may shrink slightly at extremely low temperatures. Before laying decorative panels, it is recommended to overlap the joints by 1-2cm or use aerogel strips to seal the gaps to prevent thermal bridging.
- Pressure-resistant layer design : If you are using it on the ground (such as for underfloor heating insulation), there must be a supporting structure or a protective layer with sufficient rigidity under the decorative surface layer (such as laminate flooring or ceramic tile) to prevent heavy furniture from falling directly on the aerogel.
- Adhesive : Regardless of the decorative material used, always use the recommended modified polyurethane adhesive (such as Sika 11FC) when applying aerogel . This is crucial to ensure that the decorative layer does not peel off.