Here is the English translation of the first article comparing foam sealant and cement for sealing balcony gaps:
Foam Sealant vs. Cement for Sealing Balcony Gaps: Which Is Better?
When sealing a balcony, choosing between **foam sealant (expanding foam) and cement depends on the specific situation. Below is a detailed comparison and recommendations for each option.
- Advantages of Foam Sealant
Superior Sealing Performance: Expands to fill gaps tightly, preventing drafts and water leaks. Better insulation than cement.
Flexibility & Crack Resistance: Remains elastic to accommodate thermal expansion/contraction, whereas cement may crack over time.
Ease of Use: Quick application and fast curing, ideal for small gaps (recommended for gaps under 5 cm).
Safe for Aluminum Frames: Non-corrosive to metal windows, unlike cement, which can damage aluminum.
- Advantages of Cement
Lower Cost: More economical for large gaps or tight budgets.
Better for Large Gaps**: For gaps wider than 5 cm, cement (or bricks) can provide a solid base before adding foam or sealant.
Suitable for Wooden Frames: Does not corrode wood and can be smoothed with putty for a clean finish.
- Recommended Applications
Cold Climates (e.g., Northern Regions): Foam sealant is preferred for better thermal insulation.
Humid Climates (e.g., Southern Regions): For large gaps, use cement first, then seal with waterproof caulk.
Aluminum/Thermal Break Windows: Always use foam to avoid corrosion.
Wooden Frames or Brick Walls: Cement is cost-effective and compatible.
- Key Considerations
Gap Size: If over 5 cm, partially fill with cement/bricks before applying foam.
Waterproofing: Regardless of material, always apply a silicone-based sealant as the final layer.
Workmanship: Foam must be evenly applied and trimmed neatly after curing.