PVC SDR 35 vs Schedule 40: Unveiling the Differences for Your Plumbing Needs

When it comes to plumbing projects, having a solid understanding of the different types of PVC pipes is crucial. Two popular options that often come into consideration are PVC SDR 35 and Schedule 40 pipes. 

As a seasoned plumbing expert with over a decade of experience, I have encountered numerous scenarios where the choice between these two pipes can make a significant difference. 

Let’s delve into the key differences between PVC SDR 35 and Schedule 40 pipes and explore their various applications.

Comparison Chart– pvc sdr 35 vs schedule 40

Comparison TopicPVC SDR 35Schedule 40
Material StrengthModerateHigh
Wall ThicknessThicker for underground applicationsUniform thickness throughout the pipe
WeightLightweightSlightly heavier
Pipe FlexibilityMore flexible, suitable for curved installationsStiffer, ideal for straight runs
CostGenerally less expensiveSlightly pricier than SDR 35
Chemical ResistanceResistant to most chemicals and sewageResistant to most chemicals and sewage
Pressure RatingsLower pressure ratingHigher pressure rating
UV ResistanceRequires additional protection from sunlightResistant to UV radiation

Key Differences between PVC SDR 35 and Schedule 40

Let’s explore the key differences.

Schedule 40 vs. SDR 35 for Downspout Drainage:

Schedule 40 pipes are often preferred for downspout drainage due to their sturdier construction and ability to withstand external pressure.

SDR 35 pipes, with their flexibility and chemical resistance, can be suitable for underground downspout drainage where curved installations are required.

SDR 35 vs. Schedule 40 Cost:

Generally, PVC SDR 35 pipes tend to be more cost-effective than Schedule 40 pipes, making them a popular choice for budget-conscious projects.

On the flip side, Schedule 40 pipes, although slightly pricier, offer enhanced durability and higher pressure ratings, justifying the additional cost in certain applications.

SDR 35 vs. Schedule 40 Dimensions:

SDR 35 pipes typically have a larger diameter than Schedule 40 pipes, which can be advantageous for increased flow capacity.

But, Schedule 40 pipes maintain a uniform wall thickness throughout their length, providing consistent performance.

Installation Flexibility:

PVC SDR 35 pipes are more flexible, making them suitable for projects that involve curved installations or situations where some degree of bending is required.

On the other hand, Schedule 40 pipes are stiffer and better suited for straight runs, ensuring minimal deflection.

Chemical Resistance and Durability:

Both PVC SDR 35 and Schedule 40 pipes exhibit excellent chemical resistance, making them reliable choices for handling sewage and various chemicals.

However, Schedule 40 pipes offer higher material strength, making them more durable and capable of withstanding external forces.

Pressure Ratings:

Schedule 40 pipes have higher pressure ratings compared to SDR 35 pipes, making them ideal for applications where higher fluid pressure is expected.


In this segment, you’ll get introduced to some popular relevant FAQs that’ll help you to know more. 

Can I use PVC SDR 35 pipes above the ground?

PVC SDR 35 pipes are primarily designed for underground applications due to their UV vulnerability. However, above-ground usage is possible with proper UV protection measures.

Are Schedule 40 pipes always better than SDR 35 pipes?

It depends on the specific project requirements. Schedule 40 pipes offer higher strength and pressure ratings, while SDR 35 pipes excel in flexibility and cost-effectiveness.

Can PVC SDR 35 and Schedule 40 pipes be connected together?

Yes, these pipes can be connected using appropriate fittings and adapters designed for PVC pipes.

Which pipe is more suitable for a residential sewer line?

Both PVC SDR 35 and Schedule 40 pipes are commonly used for residential sewer lines. The choice depends on factors such as the project budget and the expected flow and pressure requirements.

Do I need to insulate PVC pipes in colder climates?

In colder climates, it is advisable to insulate PVC pipes to prevent freezing and potential damage. Insulation helps maintain the desired temperature and protects the pipes from extreme cold.


Choosing between PVC SDR 35 and Schedule 40 pipes requires careful consideration of your specific plumbing needs. While PVC SDR 35 pipes offer flexibility and cost-effectiveness, Schedule 40 pipes provide enhanced durability and higher pressure ratings. 

Evaluate the demands of your project, keeping in mind factors like cost, installation requirements, and expected fluid pressure. By making an informed decision, you can ensure the successful completion of your plumbing endeavors.

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