How to Build a Cinder Block Column
- 1
Reinforcing bar adds strength and flexibility to a foundation.Stockbyte/Stockbyte/Getty Images
Prepare the foundation of the column by digging 6 inches below the surface where you want to place the column and in a square one-and-a-half times the size of the column you want to build. Fit reinforcing bar into the hole. This can be any piece of metal but commercial reinforcing bar is best. Mix and pour the concrete into the hole and level the surface. - 2). Wait for the concrete to set. When it is set, measure and mark the corners of the column centered in the foundation. Mix the mortar according to the directions provided and apply to the first block. Be sure to not leave any gaps or air pockets in the mortar. Place it in the centre of the marked area. This will serve as a guide for the following blocks.
- 3
It is critical to level the first course to prevent lean.Jupiterimages/BananaStock/Getty Images
Apply mortar to the base and sides of the block that will be touching the other blocks and place them within the marked area. Place them tightly against each other, leaving around a 1/4 inch of mortar space between each block. Remove the mortar that squeezes out with the trowel. Level the first course before continuing to the next. - 4). Apply mortar to the top of the placed block and lay on the next. Be sure to arrange the blocks so that the mortar lines are off set. If you have mortar lines that line up, it will provide a weak area in the structure of the column and could lead to cracking and failure. Apply a liberal amount of mortar to each touching side of the blocks, making sure not to leave any pockets and leaving a consistent space. Continue to scrape the excess off with the trowel and level each course both vertically and horizontally.
- 5). Insert wall ties into the mortar joints by pushing them in if you intend for your column to be part of a wall. The ties should be inserted at no less than 1 foot apart, or every other block. The ties will hold firm when the mortar dries and will provide a strong hold between the column and the wall.
- 6
Appling a capstone to the column can give it a unique look.Brand X Pictures/Brand X Pictures/Getty Images
Fill the cinder blocks if you desire. This is not a necessary step but it will add strength and stability to the column. To fill the blocks, insert a piece of reinforcing bar that will reach from the bottom of the wall to the top. While holding it in the centre of the space, pour in concrete. Wiggle the bar as you pour to help remove any bubbles.
