Azek Siding Vs. Hardie Board (2024): Which One To Pick?

Azek or Hardie is a considerable concern you must consider when looking for siding for your home construction. Among many differences, a key one is the pricing of the two board choices. Azek is a bit more expensive than the Hardie boards in general.

If you compare the two choices in-depth, you will have an effortless time figuring out the winner. So, to help you with it, I have a detailed comparison of the boards.

Let’s get through it right away.

A Quick Comparison Table

SpecificationsAzek SidingHardie Board
Moisture ResistanceExcellentNot that great
DurabilityNot the bestVery sturdy
Shrinking Shrinks very quicklyIt doesn’t shrink as much

Key Differences Between Hardie Board And Azek Siding

  • Moisture Resistance
Azek Siding
Azek Siding

Moisture resistance is a significant concern many homeowners go through while choosing their siding.

If you live in an area with a lot of moisture, this is the first thing you will worry about before siding for your home.

First, Azek siding is a wonderful choice whenever you think of moisture resistance.

The polyvinyl chloride construction on the Azek siding allows it to fight moisture. You hardly get to see any moisture damage on these siding.

As for the Hardie board, I am afraid the results aren’t the same. One of the critical issues with the Hardie board is moisture.

Moisture can easily penetrate through the board and damage the whole exterior of your house, not just the siding. Because of this, it’s not an ideal choice for places with a lot of moisture.

There is no doubt about the winner here in terms of moisture resistance. You have to go with Azek regarding the resistance of the siding. They are just a better option overall.

  • Durability

Straight up, durability is a worrying factor when it comes to siding. I mean, you don’t want something that you have to repair or replace regularly. That’s why you will need something that holds up for quite a while.

In that aspect, I have to say Hardie board is a better pick compared to Azek’s siding. The reason is the sturdy and heavy construction of the Hardie board.

Multiple layers on Hardie boards keep them safe from external damage and make them more durable. Also, they resist things like warping, high impact, climate, etc.

When you bring Azek siding in that comparison, it just falls short. It doesn’t have that kind of sturdy construction to back up the durability factor. It’s just something that lets you down in terms of longevity compared to Hardie Board.

  • Shrinking
Hardie Board
Hardie Board

Shrinking is a massive problem for siding boards. You don’t want a material that will shrink after a while.

The whole thing gets quite disturbing when the boards start to shrink.

With Azek siding, you will have to face this issue a lot. They are very prone to shrinking, especially on the joints.

They tend to shrink very quickly under incorrect temperature conditions.

The main reason for that is they have fly ash in the components. This factor makes them shrink faster than other choices.

The exact opposite happens with the Hardie boards. They don’t have any fly ash in their construction. As a result, you won’t see them shrinking or getting affected that much by thermal conditions.

So, if you are worried about the abnormal temperature around your home, I suggest you go with the Hardie board as it’s a much safer option.

  • Cost

As for the cost, it’s super easy to decide between the two choices. I would encourage you to decide on one of these based on the pricing factor.

Go with Hardie board if you plan to get the job done within a budget and save money. They are way cheaper than Azek regarding the up-front cost and installation cost.

Key Features Of Azek Siding:

  • Durable – Azek siding is made from cellular PVC, making it very durable and resistant to impact damage, moisture, insects, and rot. It won’t warp, crack or split like wood siding.
  • Low Maintenance – Azek requires very little maintenance compared to other sidings. It doesn’t need to be painted or stained, just occasionally cleaned with soap and water.
  • Customizable – Azek comes in a wide range of colors and textures, so it can closely mimic wood, stucco or other traditional sidings. There are also many trim pieces and accents available.
  • Eco-Friendly – Azek siding is made mostly from recycled materials. It doesn’t require harvesting new trees or PVC production. It’s also recyclable at the end of its lifetime.
  • Long Lifespan – Azek siding comes with a lifetime limited warranty. With proper installation, it can last 50 years or more without failing or needing replacement.
  • Energy Efficient – The cellular foam design provides insulation. This can reduce energy costs compared to sidings like vinyl or wood.
  • Fire Resistant – Azek’s PVC construction makes it very resistant to fire and flame spread. This added safety is ideal for wildfire-prone areas.
  • Easy Installation – Azek siding installs relatively easy using common tools. The planks are lightweight yet very rigid and stable. No special siding experience is required.

Key Features Of Hardie Board Fiber Cement Siding

  • Durability – Hardie Board is highly durable and resistant to rot, fire, moisture damage, insects, hail, and high winds. The cement composite material is designed to last a long time.
  • Low Maintenance – Hardie Board siding requires very little maintenance. It doesn’t need to be stained or painted frequently like real wood and holds paint longer. It just needs occasional cleaning.
  • Fire Resistance – Hardie Board is non-combustible and has a Class A fire rating. This makes it ideal for fire-prone areas. It won’t ignite from embers.
  • Weather Resistance – The fiber cement material withstands all types of weather extremes including rain, snow, high heat, and freeze-thaw cycles. It won’t crack, peel, or warp.
  • Versatile Styles – Hardie Board comes in a variety of styles such as lap siding, vertical siding, shingles, and panels. Many colors are available too.
  • Moisture Resistance – The fiber cement formulation prevents moisture intrusion far better than wood. It resists swelling and structural issues.
  • Texture Options – Smooth, woodgrain, and stucco textures help Hardie Board blend with various home styles and provide design flexibility.
  • Warranty – Hardie Board siding comes with a 30-year limited warranty, giving homeowners excellent value and peace of mind.
  • Environmentally Friendly – Hardie Board contains recycled materials and requires no harmful finishes or treatments.

Which One Is A Better Pick For You?

Once you learn about the differences and know the different factors, you can choose very easily. In my opinion, if you live in an area where there is too much moisture, I highly recommend choosing Azek. They provide excellent resistance to moisture.

But if you are thinking about saving up some money, choose Hardie, the board, without any second thought.

Frequently Asked Question (FAQ)

What is better than fiber cement siding?

Something better than fiber cement siding always has to be Vinyl siding.

What is Azek’s siding made of?

Azek siding is made of reinforced polymer composite.

Is Azek fiber cement?

No, Azek is a composite siding rather than fiber cement.

Is Hardie board better than siding?

Hardie board is a better option than siding if you think about durability.


To sum it up, Azek siding or Hardie board comes down to two factors. It’s the pricing or the resistance to conditions. The Hardie board is the way for anyone who wants to save money.

But if you want the best kind of resistance, then I would go for Azek siding without any doubt.

Ralph Wade

Hey...Ralph is here! So, did you find this article useful? If so, please leave a comment and let me know. If not, please tell me how I can improve this article. Your feedback is always appreciated. Take love :)

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