Concrete and mold

It is, at best, an unsightly nuisance and, at worst, a health hazard. If you have mold growing on concrete driveways, brick walkways or paving stone patios around your home, the first thing to do is to make sure your children and pets do not have access to the area until you can remove the mold. Mold spores can cause a variety of physical symptoms, including shortness of breath, aggravated asthma, sinus congestion, coughing, itchy eyes and much more. Of course, there is a difference between common molds like we see on food and sometimes on structures and the toxic black mold that we hear about on the news.

Concrete and mold

For instance, a birdbath has a bowl shape on the inside, and another curved shape on the outside. Other items that can be made by "sweeps" are things like planters, water dishes, dog bowls, bonsai pots, saucers, and so on.

All these items could be made by using molds, but they would require two-part molds, plus a backup mold to hold everything together while the mold was used. And if you only wanted one item, it would be a very expensive way to produce the item.

The basic idea is to rotate a template for the inside shape around some material like clay. This forms a clay bowl, upside down.


Then a template to form the outside shape is rotated around the clay, but this time with concrete between the clay and the template. After the concrete sets and the clay is removed, you have your concrete item.

All the steps are Concrete and mold with photos and described below. The item demonstrated is quite a large birdbath, 24" across, 3" deep in the center, and weighing about 50 pounds. We will be showing some custom steps that we did to make this particular birdbath, but that you do NOT need to do for most items.

For your first attempt with this technique, it would be much better to try something like a 16" wide, 2" deep birdbath, or a small bonsai pot.

Most "play sand" is easier to use for this technique because it usually has fewer pebbles. Other types of sand may have a lot of pebbles that make working with the concrete more difficult.

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The template for the large birdbath is shown below. You want to allow an extra couple inches of length in the area marked "A" so that the metal rod that will act as a pivot has a place to pass through the wood template.

Later pictures of the template in use show where the pivot will be. Your template does not need to be all wood if you have other materials available.

You could make the main arm from wood and the template that forms the actual shape from thick plastic or sheet metal for instance.

In our template, we have added a "leg" that will rest on the forming base because we are going to attempt to make a curved edge on our birdbath.

For your first project, you do not need a leg. The clay and concrete will be formed directly against the base, and make a flat edge instead of a curve. The inside shape is traced on wood You need a flat work surface covered in a waterproof material, larger than the item you are making.

A piece of flat stiff plastic is good, or you could use tarpaper. Thin plastic such as garbage bags is not a good material - it will bunch up and get in your way as you rotate the templates. Your work space should be outdoors but protected from rain, and a space that you do not need for a week or so.

A carport floor or garage floor would be ideal. For concrete to cure properly, the temperatures must stay over freezing. Temperatures over 60 degrees F would be preferable.

Take pains to make sure the pivot rod is vertical. Any leaning in the pivot rod results in your template rubbing on one side and missing completely on the other side as you rotate it. Drilling the hole in the block of wood with a drill press is a good idea if you have one.America’s Most Preferred Brand of Architectural Release Agents!.

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Concrete and mold

At the core of our competency are superior-looking surfaces − but we go beyond the. If your concrete basement walls have recently fallen victim to mold infestation, you may be wondering how to go about getting rid of are the necessary steps to remove such an infestation from your home.

Step 1 - Clean Your Basement Walls. Related: concrete stamps concrete molds pavers used concrete molds concrete bench molds concrete molds latex fiberglass concrete planter molds concrete tools concrete paver molds concrete forms concrete mold stepping stone.

Stone Paving Mold Concrete Mould Paver For Easy Unique Beauty Garden Patway New See more like this. This technique shows a simple and inexpensive way to form concrete for any type of item that has both an inside shape and an outside shape. For instance, a birdbath has a bowl shape on the inside, and another curved shape on the outside.

Plastic Mold for Concrete Plaster that imitate natural raggy brick. The front surface of the plastic shape simulates natural raggy brick.

It can be . Making Molds from Rubber Liquid rubber is a great way to make durable perfectly smooth molds. There are two main suppliers of urethane .

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