What is Block Filler – How to Apply it Correctly?

ways to apply block filler

You may have heard of block filler but do not fully understand what it is or how it is applied. 

The block filler itself is rather simple in composition. Typically, it consists of one part cement, three-parts sand, and just enough water to create a stiff patching material. 

Most block fillers will contain volatile organic compounds or VOCs.

However, the VOCs in block filler is quite low and not considered harmful under normal exposure conditions. 

In addition, block fillers may also contain the following. 

  • Extender Pigments
  • Titanium Dioxide
  • Vinyl-Acrylic Resin 

When properly mixed, the compound can be poured into the voids of the concrete blocks.

They may also be spread onto the surface to create a professional finish. 

The basic materials themselves are easy to come by, as concrete, sand, and water are quite common. 

By mixing them together in the right amounts, you can create a simple block filler. When it hardens, it will last for a long time. 

What Does Block Filler Do?

Now that you have used it to fill the blocks, what exactly have you accomplished? 

The answer is quite a bit since the overall strength and resilience of the concrete blocks have been enhanced.

The filler will add substance to the individual concrete blocks to make them stronger. 

But that is not all of what they can do. In addition, the block filler can slow down the corrosion process of materials inside the blocks. 

This means steel rods used to reinforce the concrete or other metal additions, which are normally subject to rusting, will be protected by the block filler. 

Even though the filler does contain moisture, it prevents the oxygen in the air from reaching the metal, which otherwise will start the corrosion process.  

Where is Block Filler Used?

You’ll find block filler used in different applications that require a professional finish to concrete surfaces.

Some of these include concrete blocks, cinder blocks, and masonry preparations. The cinder blocks can be poured and pre-cast. 

The block filler is applied to the surface before the topcoats so that the material is smooth and uniform.

This is similar in function to applying caulk or putty to drywalls before they are painted. 

The block filler is used to provide a professional finish where it is required. The result is that the surface is properly sealed. 

This means no voids, cracks, pinholes, or similar imperfections are present once the block filler has been properly used. 

One of the most common uses is for concrete blocks that are part of the construction of a building or structure. 

The blocks themselves are hollow, which makes them lighter and easier to move into position, along with having openings for cables, wiring, and plumbing. 

Once the blocks are in place, the voids inside can be filled using a cement-bast mortar or gravel that is small and the size of peas. 

When completed, the filled concrete blocks have properties like concrete walls that have been poured.

The inherent strength and durability of the concrete blocks are substantially increased when using block filler.

How to Apply Block Filler to Surfaces?

The first step is to prepare the surface for the filler to be applied.

Unlike pouring the filler into the openings of the concrete or cinder blocks, applying it to the outside will require proper cleaning of the surface. 

It must be free of the following. 

  • Dirt and Dust
  • Oil
  • Rust
  • Any Other Foreign Particles 

Otherwise, the presence of unwanted particles will not allow the filler to properly stick to the surface. 

Applying the block filler can be performed using different methods, such as brushing, using a squeegee, rolling, or even spraying. 

Each method of application has its own requirements.

In addition, the instructions for using one of the methods will provide guidance on the proper temperature, humidity, and thickness of the film being applied. 

Once applied, the filler will need to dry properly. The result will be a proper concrete finish that will have a uniform texture. 

You can use it on concrete, bricks, stucco, and the like. The filler will seal the surface, which makes it non-porous. 

By using block filler on the surface, you can now apply enamel, epoxy, or latex paints on the surface. 

By painting the block filler, you apply another layer of protection that seals the surface from moisture.

It is especially effective on ceilings and walls that have been compromised by moisture.

Radon Paint Sealer – Does it Really Work for Basement?
Radon Paint Sealer

With Radon warnings and sealers out there, it can send your head into a spin about whether this is all Read more

What is the Best Paint for MDF Board and Cabinets?
paint for mdf

We all love MDF for our various projects, including furniture and cabinets. After all, it's cost-effective compared to other wood Read more

Glow-in-the-Dark Paint for Walls: Does it Last Forever?
Glow In The Dark Paint

For those who want their walls to have a unique appearance, glow-in-the-dark paint is one way to express creativity. As Read more

In What Ratio Should You Mix Valspar Hardener to the Paint?
Valspar Paint Hardener

For over two hundred years, the Valspar brand has been associated with quality. Starting in 1806, the company grew into Read more

About | Contact | Disclaimer | Privacy Policy | Terms of Use

error: Content is protected !!