Brick, Block & Beers: Vol II Issue II- Masonry Best Practices: Control Joints for Concrete Masonry walls
The pictures provided show cracks under the precast header bearing at what appears to be both ends of an opening. These cracks then turn and extend up to the top of the wall through the course above the precast in a stair step fashion. The third picture provided shows cracking under the end of a precast sill which then extends from the lower right hand corner of the opening down the wall in a stair step fashion.
My response to this inquiry is based strictly on the 3 pictures provided. There may be other extenuating circumstances that I am not aware of.
The pictures provided are so indicative of classic masonry shrinkage cracking that I intend to catalog and use them in future presentations to show where cracking usually shows up in structures where shrinkage of the masonry has not been addressed by either horizontal reinforcing or properly placed control joints.
MASONRY CONSTRUCTION & INSPECTION WORKSHOP
- A written exposure control plan.
- A competent person who has been trained on the exposure control plan and silica on a jobsite.
September 6, 2017 8:00 AM - 3:00 PM Miami, FL
September 8, 2017 8:00 AM - 3:00 PM Naples, FL
When my daughters were in high school, they went to a school that had a “Six Inch Rule”. Boys and girls had a 6” rule of separation. Now, as most of you fathers of daughters know, six inches is simply not enough!
A distance that can be critical for a masonry contractor is the distance from which masonry should be viewed to determine its acceptability. If we have reached the point of trying to view the masonry from a certain distance, we already have a problem.
Read the whole story here: https://www.masonrymagazine.com/blog/2017/06/01/painters-corner-mcaa-magazine-2/
Painter's Corner - MCAA Magazine
What can I do about congestion? The short answer is take an anti-histamine and call your doctor. Oh, not that type of congestion! That’s a sinus problem and all in your head anyway!
Congestion in a concrete masonry unit (CMU) wall creates frustration and aggravation for the mason. This leads to lower productivity and the possibility of mistakes by actions or omissions. Add it all together and you have created the potential for a less than expected quality product.
“Congested” is defined as something being too full or overcrowded. There are several ways that CMU wall can suffer from congestion. The main contributors to the clutter in the CMU wall are the mechanical, electrical, and plumbing trades. Masonry is the only one of the three major wall types that is expected to accommodate their “stuff” as we build the wall. Wood and stud walls are built and then the MEP folks do their rough install. On the other hand, we (masonry) are expected to install piping, boxes, conduit, holes for duct work, etc. the accumulation of these things created congestion.
Read the full article: https://www.masonrymagazine.com/blog/2017/05/01/painters-corner-mcaa-magazine/
Florida Building Code
Hyatt Regency Coconut Point
MAF Masonry Award
Wood Frame Construction