The question, “Can You Use Aerated Blocks Outside,” is one that many DIYers and builders ponder when considering versatile construction materials. Aerated blocks, also known as autoclaved aerated concrete (AAC) blocks, are renowned for their lightweight nature and excellent insulating properties. But their application isn’t limited to interior walls. Let’s explore their suitability for external use.
The Great Outdoors Aerated Blocks Explained
Absolutely, you can use aerated blocks outside, but with a few crucial considerations to ensure their longevity and performance. These blocks are manufactured by introducing an aeration agent into a concrete mix, creating a cellular structure filled with small air pockets. This gives them their characteristic lightness and thermal efficiency. When used externally, it’s vital to protect them from direct moisture exposure. This protection typically involves a robust external rendering or cladding system. Without adequate weatherproofing, the porous nature of aerated blocks could lead to water absorption, potentially causing freeze-thaw damage and weakening the structure over time. The importance of proper protection cannot be overstated for successful external applications.
When planning for exterior use, several factors come into play. The type of finish you choose is paramount. Options include:
- Cementitious renders
- Silicone-based renders
- Brick slips
- Timber cladding
- Stone cladding
Each of these has its own advantages and installation requirements. For instance, a breathable render is often recommended to allow any trapped moisture within the blockwork to escape. The structural integrity of the wall is also a key consideration. While aerated blocks are strong, for load-bearing external walls, you might need to consider thicker blocks or additional structural reinforcement depending on local building codes and the specific design of the structure.
Here’s a quick comparison of factors to consider for exterior vs. interior use:
| Factor | Exterior Use | Interior Use |
|---|---|---|
| Moisture Protection | Essential (rendering, cladding) | Less critical, but still advisable |
| Thermal Insulation | High benefit | High benefit |
| Fire Resistance | Excellent | Excellent |
| Sound Insulation | Good | Good |
Furthermore, the foundation and drainage around the external walls play a significant role. Ensuring that water is effectively channeled away from the base of the wall will greatly contribute to the durability of aerated block constructions. Proper detailing around openings like windows and doors, along with adequate roof overhangs, also helps to shield the blocks from excessive rainwater.
For a comprehensive understanding of the technical specifications and best practices for using aerated blocks in outdoor environments, consult the detailed guides and product information available from leading aerated block manufacturers.