Can You Encase PVC Horizontally in Concrete?

Can You Encase PVC Horizontally in Concrete?

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Can You Encase PVC Horizontally in Concrete?

PVC is a consumer-grade, flexible plastic used to make all types of items. PVC is a polymer that consists of carbon and chlorine atoms as the main constituents in long chains.

You can crosslink these long chains with an organic acid (typically ethylene).

No! When you cover your PVC tubing in concrete, you cannot see it from the outside of the concrete as it is buried. It will not be watertight, and the PVC pipe inside will erode. Instead, you should encase your PVC in steel or another metal, like aluminum, that can withstand the chemical reaction of concrete.

The concrete will not get into the steel but will protect the pipe from moisture. This is evident in many swimming pools with steel rebar inside the concrete (as opposed to PVC).

Remember, encasing your PVC horizontally in concrete provides no bends in the tubing. This way, you can insert a rebar into it without damaging or distorting it.

You should also make sure you seal the rings from each other. Most importantly, it is important to ensure that there is room for expansion and contraction in your concrete or rebar casing.

Here is a list of materials and forms that you can use for encasing PVC in concrete:

  • Concrete rings with or without rebar: Steel rings, Aluminum forms with rebar steel.
  • Pipe and fittings: PVC fittings, Aluminum forms with PVC elbows, pipes, and fittings.
  • Other pipes, fittings, and fixtures: Pipe sizing is important so that the concrete can expand enough to allow the pipe to expand and contract with the changing temperatures of your environment.
  • Timers: PVC Water System timers are essential in systems with PVC piping encased in concrete.

What Is the Disadvantage Of PVC In Underground Installation?

PVC Is Very Sensitive To Oils And Petroleum Products-Degrades the material and causes it to crack.
-Causes corrosion which can lead to an explosion.
PVC Is Highly Flammable-Burns quickly and easily.
 -Continues to burn even when you remove the flame.
 -Exposes the pipe to deterioration.
PVC Is Highly Toxic-Carcinogenic, can cause death if you ingest or swallow.
-Contains phthalates, which are harmful to the liver and kidneys.

-May cause congenital disabilities or harm an unborn child, if ingested.
-Will create congenital disabilities in humans and animals.
PVC Is Highly Corrosive-Causes permanent corrosion if you allow it to remain in contact with soil for long periods.

-Continues to corrode even when the soil looks clean.
– Corrosion will inhibit the grouting process and leave the pipe susceptible to leakage.
PVC Is Easy To Crack, Break, And Fall Apart-Exposed to temperature changes or seismic activity.
-May crack under the weight of heavy objects being placed on top of it.
-Often falls apart during the installation process
PVC Is Very Susceptible To UV Damage From Sunlight– Leaves pipe susceptible to leakage, cracking, degradation.
– Causes discoloration, which may camouflage a leak or other problem.
-Can cause degradation of the material.

Can You Bury Schedule 40 PVC In Concrete?

Yes! You can bury 40 PVC in concrete. But I wouldn’t recommend it because it can cause damage to the pipe over time.

You can damage your pipe because of the concrete weight and the ground movement (which can loosen the pipe from the ground).

I would use Schedule 80 PVC for underground piping. It is made of a thicker, more durable material and can withstand more weight than Schedule 40 PVC when buried in concrete.

The strength of the pipe is important because if your pipe gets damaged, you will have to dig up the concrete and repair anything that has been damaged.

Also, if you use PVC for your sprinkler system, I recommend using a pipe rated for PVC irrigation. The irrigation pipe is made to withstand great pressure without bursting.

And it will not rust or corrode as fast. You can use the other PVC pipe underground, but I would only use schedule 80 PVC pipe in your sprinkler system.

When choosing a pipe, you should make sure that it is corrosion-resistant. Also, you have to consider the weight of the concrete.

Can You Encase PVC Horizontally in Concrete?

Some concrete pipes weigh between 5 and 10 pounds per foot (1.5 to 3 kg/m). That is a lot of weight for PVC to hold up.

How Deep You Need to Bury PVC Under Concrete?

Type of PVCHow Deep
PVC-U Unplasticized PVC)0.6 to 6 meters
C-PVC (Chlorinated PVC)12-18 in. underground in light traffic areas and 30-36 in. in high traffic areas.
PVC-O (Molecular-Oriented PVC)Six inches.
Modified PVC12 inches.

Where Is PVC Not Permitted to Be Used?

Strom Drains-Most municipalities will not allow it because of the chemical reaction with copper.

-PVC is more prone to kinking, causing clogs and blockages.
-Insufficient strength.
Supply Drains-Exposure to corrosive substances.
-It is cheaper but weaker, so it cannot withstand the constant flow of water.
-Hence, not strong enough to prevent leakage.
Waste TrapExposed to corrosive substances like sulfuric acid in sewage and wastewater.
Sewage SystemExposed to corrosive substances like sulfuric acid in sewage and wastewater.
Drain LinesExposed to sulfuric acid in sewage and wastewater.
Cold Water Supply LinesProne to kinking and causing clogs.
Bursting of the pipes.

How do you seal PVC pipe through concrete?

Type of SealHow to Seal
Hydrophobic Grout-Apply the grout to the top of the concrete using a putty knife.
-Spread the grout evenly over the fresh concrete.

-Allow it to set for twenty minutes, and then wipe off any excess.
 -Finish with a trowel to level out the surface.
Silicone Sealant-Use a plastic, flexible caulking gun to apply a bead of sealant around the outside of the PVC pipe inside and on top of the concrete all around.

-Continuing past where it protrudes from the top of the concrete by approximately one inch (2.5cm) in both directions.

-Apply sealant to the top of the PVC pipe on all four sides and then to the underside.

-Allow the sealant to cure for 24 hours, blot off any excess with a wet rag, and then paint over with latex-based paint. The completed area will be waterproof.

-The only problem is how long it takes to dry after putting the sealant on. I left it on for 6 days before painting.
Waterproofing Membrane-Use a utility knife to cut a piece of the membrane large enough to cover the PVC pipe and concrete.

-Apply a bead of silicone around the outside edge to waterproof it.
 -Use a hose to wet down the inside of the pipe and concrete area.

-Roll out the membrane on top of this wet surface, keep it in place with weights (I used plastic bags filled with sand) for at least 24 hours, then paint over.
RTV Sealant-Use a plastic, flexible caulking gun to apply a bead of sealant around the outside of the PVC pipe inside and on top of the concrete all around.

-Continuing past where it protrudes from the top of the concrete by approximately one inch (2.5cm) in both directions.

-Apply sealant to the top of the PVC pipe on all four sides and then to the underside.
Mechanical Anchors-Drill holes in concrete behind the pipe with a hammer and screwdriver.
– Insert anchors into holes so they protrude past the concrete by approximately one inch (2.5cm).

-Attach the anchor to PVC pipe with a flexible hose clamp, then plug in and hide the anchors inside of concrete.

Is PEX or PVC better for the underground?

 Corrosion-It is more resistant to corrosion than PVC because it does not contain many additives that can cause lead and copper corrosion.-It is made of a high percentage of plastic; if you expose the plastic to salt water or chlorinated water, it will crack.
CostCosts about 1/4 as much as PVC across all grades.It is sometimes less expensive.
FlexibilityIt is typically easier to install than PVC because its bend radius is smaller.Requires tensile strength, and you cannot penetrate it with a nail, whereas you may penetrate PEX with a nail
HandlingIt is easier to handle because it’s lightweight, low friction, and non-toxicIt has higher friction because the pipe is made of plastic. making it harder to push through the ground with a plow.
Bursting Pressure1/4″ PEX has a bursting pressure of 2900 PSI,1/2″ PVC has a bursting pressure of 800 PSI.
Freeze/Thaw ResistanceIt is more cold-resistant than PVC.It has a lower freeze/thaw resistance than PEX due to its plastic nature.

Do You Need To Prime PVC Pipe Before Cement?

Yes, To create a secure bond, clean your prime PVC pipe before cementing. Primer helps soften the PVC to promote the cement’s adhesion and prevent leakage.

You should apply primer at all threaded fittings and other areas where you install a glue joint, such as corners and the junction of two pipes.

Priming also helps to make the pipe more flexible after you cement it and prevents air bubbles from forming in the interior of a pipe.

The most common type of primer for PVC pipe is epoxy. Epoxy primer is non-toxic; you can easily apply and will not break down in the environment like some caulk.

Epoxy is also easy to mix, and you can apply it to various materials and pipes. Epoxy is available in kit form, which allows you to mix up the right amount of epoxy for each job.

Can You Encase PVC Horizontally in Concrete?

The best time for various prime PVC pipe types is when the material is still soft. The best way to determine when a product is still soft is to touch your finger against the product.

For example, a white primer will be harder than a yellow primer. A shiny primer will be harder than an unpainted primer. A color primer will be harder than a clear primer.

If you get a tacky feeling, then the product is still soft.

Is Purple PVC Primer Required?

Yes! Before cement, you must prime the PVC pipe to form a proper bond between the PVC surface and glue for joining fittings and pipes. Prime any PVC pipe, no matter how small.

Most experts agree that you should prime all plastic pipes at the factory before they are shipped to where they are used. This applies to the entire length of the pipe.

The reason for priming PVC piping is twofold: First, the glue used for plastic pipe fittings will have a better bond strength with your cement if applied to an already primed PVC pipe.

Second, when priming PVC piping, you can eliminate air bubbles. This will ensure that your cement hardens and forms a strong permanent bond between your pipes and fittings.

How To Prime Plastic Pipe

  1. Get some PVC primer mixed according to the label directions.
  2. Lay a PVC pipe on the floor and apply a thin coat of primer to one side of the pipe.
  3. Slide the pipe up and down, applying more primer as you go.
  4. You should hear and feel no firm hit when you tap the end of the pipe with a mallet.
  5. Don’t let any primer flow onto other surfaces within your shop.
  6. When priming the pipe, wipe the excess primer with a rag.
  7. Allow the primer to dry for 2 hours before joining.
  8. The next time you prime PVC pipe, try spraying it instead of rolling it with a roller. Spray it in all directions to ensure that you have covered it.

Can You Use Too Much PVC Primer?

No! Using too much PVC primer can cause improper bonding with the cement, which could lead to cracks if the cement gets wet before drying.

This can happen if the primer is watery, but it can still happen even with a thicker primer.

If the primer gets on surfaces you don’t want to paint, use a dry rag to wipe it off before the paint dries. You may need to do this several times over the next few days while applying PVC cement or paint coats.

If you apply too much primer, you risk getting a delaminated surface. This is where the primer lifts off due to moisture.

It’s more likely if the primer is watery, but it could also happen with a thicker primer. Sometimes PVC adhesives can have a chemical reaction with paint.

It’s not unheard of for the paint to bubble and lift off the surface. This could happen a few days after painting or even after months of drying.

If this happens, you’ll need to sand or scrape the paint off the surface before reapplying primer.

If you need help deciding which primer to use on a project, test it by putting some adhesives on scrap material.

Let it dry for a week and see how well it holds up to moisture. You may need to change primers if it needs to be more durable.

Can You Encase PVC Horizontally in Concrete?

If you’re using boat paint for PVC cement, be sure not to use too much. It’s more likely to lift if the surface is wet.

I’ve found that polyurethane boat paints hold up better than polyester boat paints; they’re less likely to delaminate when wet.


I hope you’ve also learned a few things about PVC piping, in a particular underground pipe, the different types of PVC Pipe, and how you should use them.

If you’re looking for an easy and inexpensive way to do plumbing and improve your home’s value and the value of your investment properties, then consider PVC piping.


Hi! I I faced many questions from customers about different products, and there was hardly any help on the internet. After learning all the things about these products as a manager the hard way, I decided to start a blog and help other people.

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