The Problem With Aircrete Blocks
https://youtu.be/TCAIZiQu3W4
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Cracking in aircrete blocks (Celcon, Thermalite, Durox, Hebel and Ytong etc.) causes a lot of anxiety, but in most cases it isn’t structural failure and it isn’t unusual.
What matters is understanding why it’s happening and whether it needs action.
Aircrete behaves very differently to dense masonry. It’s softer, more flexible, and far more sensitive to mortar choice.
When the wrong mix is used, the blocks often crack instead of the joints — which is exactly what you’re seeing here.
The key is knowing when cracking is cosmetic, when it’s predictable, and when it’s a sign that something else is going on. Get the basics right and aircrete performs exactly as it should.
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Key Takeaways
• Cracking in aircrete blocks is very common and often expected
• The most common cause is mortar that’s too strong or too rigid
• Aircrete is designed to move slightly — the mortar should accommodate that movement
• When the mortar is harder than the block, the block will crack first
• Most aircrete cracking is cosmetic rather than structural
• Correct mortar choice is critical for long-term performance
• Understanding the material prevents unnecessary worry and over-repair
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#AskSkillBuilder #Aircrete #Blockwork #MortarMix #Bricklaying #BuildingAdvice #ConstructionUK #Masonry #SiteKnowledge #BuildingBasics
