JavaScript must be enabled in order to use this site.Please enable JavaScript in your browser and refresh the page. Stress and Crack Width Designs Note: Some UK slab designers consider that designing slabs according to TR 43 is "deemed to comply" with the EC2 crack width provisions and hence the EC2 crack width calculations need not be checked. We will take that approach here. To have Concept use only the TR43 stress limits Calculate and Review Updated Status Parent topic: Calculate and view the results