Why do concrete blocks have holes in them?
Monday, June 18, 2018
The openings are called “cells” and one reason they are there is because they make the blocks lighter and easier for a mason to handle. But the primary purpose of the cells is that they align from top to bottom of the wall when laid, and enable a builder to fill some cells with grout/concrete to strengthen the wall. It is often done at sides of larger window and door openings, and vertical steel reinforcing bars are added. This detail is especially important in hurricane-prone areas of South Florida that are designated by the Florida Building Code (FBC) as within the High Velocity Hurricane Zone (HVHZ).
See our blog post What are the pros and cons of concrete block versus wood frame construction? to learn more about concrete construction.
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To learn more about exterior walls and structures, see these other blog posts:
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