New answers tagged


You have a problem. The cracks * are * a risk. The problem is, that if water penetrates - and it will, quickly or slowly, over months or decades, it will corrode the steel. Corroding steel expands with great force, forcing the concrete open, and exposing the steel to more water flow,and deeper. Over time, you end up with this kind of problem if you are ...


Potentially there are three issues. The cracks could be caused by any single issue or any mix of the issues. Not enough clear cover over the rebar mat. The concrete mix contained too much water (high slump), which usually is the result of adding water during concrete placement to make it more workable (self- floatable). High slump concrete mix is likely to ...


This is known as "plastic settlement cracking", a type of shrinkage crack. It's the result of the rebar being too close to the surface. As water settles out of the concrete, it tends to shrink downward. If the rebar is close to the surface the concrete tends to pull around it and gaps appear. Plastic settlement cracks can form in young concrete, ...


I'd replace it. Don't mess with CO and your life. I doubt any tech will tell you that it is safe. Even if the crack is small now the chance of it changing and the result of the risk of that change is too great.


Indeed, the crack was caused by the movement of the support. You can examine the foundation by digging or opening up the interior (wood frame) wall to check the sill plate, which will not be in full contact with the foundation if it has settled.


If the wall is constructed of brick, as opposed to the brick being a façade, then yes, you have foundation movement. Whether it's still moving, and whether it's something that needs to be addressed urgently is anyone's guess with the little information we have. You'll need to investigate the foundation situation to learn more.

Top 50 recent answers are included