Without a control joint, cracks in concrete floors, walls, or ceilings appear at stress points in uneven, diagonal, or other patterns in locations where they may be unsightly or may cause damage such as cracks in ceramic tile or other floor coverings, or may be traced to leaks. What is a concrete slab control joint & why do we need control joints in concrete?Ī control joint controls where and how a shrinkage crack appears in poured concrete, and it allows for thermal expansion or contraction without additional damage. Separately at CONCRETE SLAB CRACK EVALUATION we catalog the different types of cracks that show up in poured concrete. But control joints are also required in certain masonry walls, including brick walls and in some cases concrete block walls as well as poured concrete walls. Here we focus on control joints needed in poured concrete floor slabs and monolithic concrete foundations. How to Use & Inspect Control Joints in Poured Concrete Slabs We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series describes how to recognize and diagnose various types of foundation failure or damage, such asįoundation cracks, masonry foundation crack patterns, and moving, leaning, bulging, or bowing building foundation walls. This article describes the causes, evaluation, and repair of cracks at control joints in poured concrete slabs or floors.Īre cracks at control joints or expansion joints in concrete a problem? Are control joints always needed in poured concrete? Recommended methods for sealing cracks in concrete floors & slabs We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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