The type of insulation used for exterior walls can vary depending on several factors, such as climate, building codes, and construction materials. The most common types of insulation used for exterior walls include:
1. Fiberglass Insulation: Fiberglass batts or loose-fill insulation are commonly used. They are made of tiny glass fibers and are effective in reducing heat transfer.
2. Spray Foam Insulation: There are two types of spray foam insulation: open-cell and closed-cell. Open-cell is less dense and is mainly used for soundproofing, while closed-cell is denser and provides better insulation and moisture resistance.
3. Cellulose Insulation: Made from recycled paper and treated with fire retardant chemicals, cellulose insulation is blown into walls and provides good thermal insulation and soundproofing.
4. Rigid Foam Insulation: Rigid foam boards made of polystyrene, polyisocyanurate, or polyurethane are used for exterior insulation. They provide excellent insulation, moisture resistance, and can also act as an air barrier.
5. Mineral Wool Insulation: Also known as rock wool or slag wool, mineral wool insulation is made from volcanic rock or steel industry waste. It has excellent fire resistance and can also provide soundproofing.
The choice of insulation material depends on factors like cost, R-value (thermal resistance measure), moisture resistance, fire resistance, and the specific requirements of the building.
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