How to Prevent Cracks on Window Opening Corners - Tagalog Tutorial

1. Causes of cracks appeared on hollow block walls explained. This is due to different materials that reacts during thermal expansion (hot and cold weather). Open corners are the weak points that results to suffer diagonal cracks because concrete is weak in shear resistance. 2. Step by step procedures on how reinforcing bars through hollow block walls should be placed. 3. Extent of reinforcing bars beyond window opening are illustrated. 4. Concrete lintel beam are introduced on top of the proposed window to carry the succeeding layers of hollow block. The thickness and height of this beam are suggested to match the size of the hollow blocks for proper alignment.