What are the holes in concrete

Surface voids are the cavities or little holes that appear on the surface of concrete castings. Surface voids (commonly known as pitting) are referred to as “bug holes” or “fish eyes”. These voids may produce an unacceptable appearance on the surface of the finished casting.

What are the round holes in concrete?

They are usually called tie holes. After the concrete is cured and forms need to be removed their ends protruding out are bent and snapped.

Why does concrete have dimples?

Concrete pitting can sometimes be traced back to the pouring of the material. … The accelerator will force water to dry faster inside the concrete, and this creates the dimpled, pitted surface in driveway. Also, the accelerator may not have been properly mixed throughout the concrete.

Why are there holes in the concrete?

Air. Air becomes entrapped in concrete during the mixing and pouring process. While some air is necessary to avoid damage when the concrete experiences freezing and thawing temperatures, too much causes blisters or bubbles on the surface that then erupt into holes.

Why are there holes drilled in my foundation?

As water leaks into the wall, it enters these hollow cavities and increases hydrostatic pressure. … These holes effectively drain water from the CMU blocks to put less pressure on your walls and your foundation. Once the holes are drilled, water will then drain into the French drain system.

How many weep holes are there?

Vents are required at 450mm intervals and each opening should have at least 2 weep holes.

Why are there holes in my concrete driveway?

Problem:Small pop outs or holes that occur on concrete slabs are often the result of lignite or shale carbons that were in the sand when the concrete was mixed. … When water penetrates and freezes, these particles expand more than water and pushes the top off of the concrete creating a small hole.

How do you fix pitting in concrete?

You can fill pits with a bonding concrete repair material, which is similar to caulk. Restoring the porch to a more original appearance requires dressing it with a special resurfacing concrete mixture. Before you begin, pressure-wash the concrete or clean it with concrete cleaner.

What are rod holes in basement?

Tie rod holes in basement walls are created by the 5/8” rods used to hold the steel forms together during the original foundation pouring of your basement. After the concrete has cured, the rods are disassembled and when they are removed, holes are left that go straight through your foundation.

How do I stop my driveway from pitting?

Fill all cracks and large holes with concrete patch or the material you’re using to resurface the driveway. If the cracks and holes are deep, fill with them with sand until they’re 1/2 inch deep, then patch. Be sure to smooth it flat with a trowel, and allow the patch to dry.

Article first time published on

Can I fill in weep holes?

Whatever you do, do not fill those weep holes. They’re an integral part of the drainage system to keep water from building up behind the brick. If allowed to contact any untreated lumber, this water will cause serious wood rot, mold and, eventually, structural problems with your home.

Do all houses have weep holes?

Weep holes can be found on virtually all houses with brick siding, whether they’re brand new or centuries old. Because bricks and mortar are porous, they absorb water that can seep through the bricks and then run down the backside of the bricks.

Do weep holes work?

In an ideal situation, weep holes will work as they should, taking water out of the house and letting it dry up quickly. In the real world, however, weep holes are places where small mice, insects, and other little critters get in and start living.

What are rod holes?

Rod holes are created at the time of building a foundation wall. They were created by smooth, steel rods, approximately 5/8″ and are placed in rows within the concrete foundation-form panels, in order to hold the concrete forms together and to prevent bulging from the weight of wet concrete.

Why does my basement leak when it rains?

The most common causes of basement leaks is pressure created by water in the soil surrounding the foundation. … During periods of heavy or persistent rain, the soil can become saturated, creating hydrostatic pressure (or water pressure) that can push moisture and water through your basement walls and floor.

What kind of gravel is best for a driveway?

• Crushed Stone #411. It is crushed up #57 stone combined with rock dust. …
• Quarry Process. …
• Pea Gravel. …
• Jersey Shore Gravel. …
• Marble Chips. …
• Blackstar or Blacktrap Rock.

Can you patch holes in concrete?

Most holes can be fixed with a quality mortar mix, although you should use one with a crushed stone aggregate to fill holes over 1 in (2.5 cm) deep. Treat holes as soon as you find them so you can prevent water and rodents from further damaging the concrete and getting into your home.

What does spalling concrete look like?

Spalling concrete can look like round or oval depressions along surfaces or joints. Spalling tends to be most common in cold climates when de-icing chemicals are applied or when seasonal freeze-thaw cycles damage the concrete.

Why is my concrete chipping?

When the temperature drops below freezing, moisture in the concrete tends to expand, creating internal pressure. Over the course of a winter, or over the course of years, as the internal pressure rises and falls, it stresses the surface layer of the concrete, which leads to spalling.

Why do driveways crack?

Concrete driveways can crack for many reasons. Repeated freezing and thawing, heavy loads, tree roots and even shifts in the ground can cause damage. When you learn how to repair cracks in a concrete driveway, you may be able to stop them before they lead to bigger problems.

Are cracks in concrete driveway bad?

Cracking is a normal occurrence when it comes to concrete driveways unless it’s excessive and it happens very soon after installation. Cracks will need to be sealed to prevent further damage which is part of the ongoing maintenance of a concrete driveway that will need to be performed on a regular basis.

Does sealing concrete prevent cracks?

Protecting Concrete A concrete sealer can reduce freeze-thaw damage by reducing the water absorbed by the concrete. … One effective product that protects concrete from cracks is Sikagard 701W.

Can snakes get in weep holes?

Rats, mice and lizards will get in the house thru weep holes, and snakes can go ANYWHERE they can go. Usually they will end up in the attic.

Why do bricks have 3 holes in them?

The holes make the bricks weigh less. 3. Holes allow a consistent heat distribution throughout the brick when it is cooking in the kiln, resulting in a thorough and even cure. … These holes, filled with mortar provide a “keyway,” locking one brick to the next.

What are bricks with holes called?

Face/Structural Bricks. … When building a garden, house or wall, bricks with holes—often referred to as face bricks or structural bricks—are used. It’s important to note that not all face bricks contain holes. For example, brick pavers, which are both heavier and stronger, are designed to lay flat on the ground.

Can you concrete over weep holes?

You could concrete over them but if you get mould, rising damp, termites or other issues that can be avoided (these may happen anyway but less chance of it without the higher concrete) then you would need to accept it. The step down won’t be a big issue IMO. Re: Covering Weepholes?

How do you keep insects out of weep holes?

Corrugated plastics and steel wool pieces are also used to deter pests. While this may work short term, it is not a permanent solution. Corrugated plastic leaves spaces large enough for small insects, like termites, or determined insects, like roaches, to pass through the weep.

Can mice get in weep holes?

Weep holes help to prevent moisture damage and are necessary for the structural integrity of your brick house. Unfortunately, they are also a very common point of entry for mice and rats. Other pests can also use the weep holes in bricks to gain entry, like snakes, scorpions, lizards, bees, wasps, and spiders.

What is a drain hole?

1. n. [Well Completions] A hole or short conduit through which fluids can flow. In equipment applications, a drain hole is generally made to avoid the buildup of pressure within a nonpressure area, such as may occur in the event of a leak in a pressure housing within a tool assembly.

What is behind brick on a house?

Behind the brick veneer is a wood frame wall which is actually holding up the house. The brick veneer is, in effect, siding! Insulation. Brick veneer became the norm when building codes began to require insulation in the exterior walls.

Why is there a gap between bricks?

Q: There are gaps between some bricks around the base of my home. … Those gaps are called “weep holes” — a building code requirement that drains water out of brick exterior walls. Typically, behind the brick is a 1.5-inch cavity or air space and then the wood structure.