How and how to repair cracks in the oven

Sometimes the owners of houses and baths with brick ovens are faced with such a problem as cracks in the masonry. This must be fought without delay! Our advice site will tell you how and with what you can cover up the cracks formed on a brick oven.

Repairing a crack in a furnace

First, let’s figure out for what reasons cracks can appear on a brick oven:

  • There was a long break in the process of heating the house and using the stove. For example, she stood for a week in the winter without the owners, who came to the dacha on a weekend and decided to light the stove. As a result, there was a sharp temperature drop..
  • Initially, a poor-quality masonry mortar was used. In this case, the cracks go along the seams, it is immediately noticeable where the furnace has a weak spot.
  • The joints between the bricks are too thick or too thin. Cracks will also follow them..
  • The house is new, the foundation is shrinking, respectively, the furnace has also suffered.
  • The owners did not wait until the brick oven was completely dry at natural temperature and decided to flood it.
  • The ventilation was not efficient enough, as a result, condensation formed on the walls of the furnace.

Cracked oven

Important! It is necessary to determine whether the crack is growing or has already settled down. How to do this using glass lighthouses, the portal described in detail in an article on cracks on the walls of the house and the fight against them..

If the crack is through, the brick itself has burst, if it continues to expand, then a simple putty cannot solve the problem. It is necessary to change the problematic place of the masonry, dismantle the damaged bricks and find out exactly the cause of what happened. Most likely, you will have to invite a stove-maker if the owners do not have experience in this area..

Furnace repair

If the crack is relatively small, goes along the seams, does not grow, the problem can be solved quite simply. The main thing is not to delay! Cracks in the oven masonry can cause carbon monoxide to enter the room, and this is a direct threat to life. Therefore, repairs should be started immediately..

In order to cover up cracks in the oven, use:

  • Fireclay clay. Environmentally friendly, inexpensive material used for the production of refractory bricks. The putty is done as follows: 2 parts of chamotte clay, 7 parts of sand and 1 part of cement grade 500. A mixture of these three components is diluted with water to the desired consistency.
  • Ordinary clay and sand, 1: 1. The most budgetary option, but you cannot call it a sufficiently strong and durable way to get rid of a crack. Rather, it is a temporary measure until the owners make a more resistant compound to cover up the problem area..
  • Ready-made compounds – oven glue and grout. Sold dry, diluted with water, according to the manufacturer’s instructions. It is necessary to dilute oven glue and heat-resistant grout in small portions, as they harden quickly enough.

Preparing a mortar from clay and sand

The process of sealing a crack on a brick oven looks like this:

  1. If the stove is plastered, you need to remove the trim, get to the very base of the crack. Cracked grout is also removed. The crack area should be increased so that the solution penetrates as deeply as possible, at least a centimeter inside the masonry.
  2. Now you need to walk through the problem area with a deep penetration primer. And wait for it to dry.
  3. The stove should be heated, keep the firewood low, do not raise the temperature too high.
  4. Until the stove has completely cooled down, use a spatula, a large paint brush, or a paintbrush to apply the solution to the crack and inside the masonry..
  5. For reliability, experts advise using a reinforcing mesh over the putty so that cracks do not reappear. And two layers of plaster up to 5 millimeters thick. But this is no longer just a crack seal, but a complete overhaul of the entire furnace, its complete finishing. Therefore, you decide. Perhaps just covering up the crack will be enough. If it appears again – well, it’s time to reinforce the masonry and cover it with plaster for a global solution to the problem..

Preparing joints for new mortar

Repairing furnace cracks

Plastering kiln using mesh

After repairing the stove and covering up the cracks, you should not rush to re-heat your Russian stove or another version of the hearth. Let everything dry well for at least a day.

Rate article
Tips on any topic from experts
Add comment

By clicking the "Submit comment" button, I consent to the processing of personal data and accept privacy policy