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Modern reinforced concrete can contain varied reinforcing materials made of steel, polymers or alternate composite material in conjunction with rebar or not. Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. In corrosion engineering terms, when designed correctly, the alkalinity of the concrete protects the steel rebar from corrosion. In terms of volume used annually, it is one of the most common engineering materials.

However, post-tensioning is also employed as a technique to reinforce the concrete. The reinforcement is usually, though not necessarily, steel bars ( rebar) and is usually embedded passively in the concrete before the concrete sets. Reinforced concrete, also called ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility.

Poured concrete foundations have low R-values of less than 3.A heavy, reinforced concrete column, seen before and after the concrete has been cast in place around its rebar frame.

Dry spots in the concrete wall may occur by improper grading or poorly planned outdoor construction.

Leaks can happen if the foundation drops, settles, or sinks due to the soil below the foundation collapsing.

Poured concrete walls may leak moisture through non-structural cracks in the wall (where the wall and floor meet, at the top of the foundation wall or through the porous concrete).

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Poured concrete can crack and leak if not prepared correctly.

Water leakage issues in poured concrete foundations.

Contractors may find it difficult, time-consuming, and costly to truck in wet concrete to the job site.

Poured concrete foundations cost more than CMU block foundations.

If spalling (when the concrete surface peels, crumbles, or flakes off) occurs during curing, the poured concrete foundation can lose its strength.

The Cons of Poured Concrete Wall Foundations

A poured wall doesn't have joints like a block wall, so it is easier to waterproof.

Poured concrete walls have better lateral strength than CMU block foundations, which improves their resistance to pressure from water and soil.

The strength, density, and joint-free construction of poured concrete foundations minimizes water issues.They take less time to construct than CMU block foundations.The Pros of Poured Concrete Wall Foundations Rebar, installed in the footing, limits weak points and joints. Next, in one continuous pour, workers pour concrete into wooden forms to harden (cures) on site. Traditional poured concrete foundations involve constructing and properly securing large, heavy, wooden walls. Traditional Poured Concrete Wall Foundations CMU block walls have low R-values ranging from 2 to 3.CMU block foundations have good load-bearing strength however, the foundation will lose its lateral strength if not fully grouted with rebar.CMU block foundations may bow and buckle if the water in the soil around a structure builds up, resulting in costly repairs.Water and weather wear down the mortar used to join the CMU blocks together - this can cause leaks.Improperly reinforced CMU blocks produce weak foundations.A CMU block wall often requires installing an air and moisture barrier, which adds another trade and more labor to the foundation project.8-in blocks weigh 36lbs, 10-in blocks weigh 42lbs. Concrete masonry units are heavy to handle.The Cons of Cinder Block (CMU) Foundation Mortar secures the blocks together, which rest on concrete footings.

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To optimize strength and stability, workers install the blocks in a running bond pattern and may insert steel reinforcing bars in the core of the blocks. However, sizes can vary depending on the building's weight load. Cinder Block (CMU) FoundationsĬMU block foundations often use large (8-in or 10-in wide and 16-in long), hollow concrete blocks.

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These materials are easy to install and can increase structural lifespan, but what sets them apart from each other? And which is the better choice for your project? We cover the differences between CMU blocks and poured concrete foundations below so that you don’t have to learn from trial and error. Two of the most effective methods for creating wall foundations are poured concrete walls and cinder blocks - more professionally known as Concrete Masonry Units (CMUs). Structural foundations are the backbone of every new building, which is why it’s critical to make sure that they are done right.

Concrete block rebar