Which Siding Has the Highest R-Value?

If you’re living in the beautiful states of Maryland or Virginia like I am, you’re probably all too familiar with our sometimes chilly winters, and oftentimes very hot summers. 

Well, today we’re doing a deep dive into a topic and home improvement project that’s critical for our comfort and energy bills, no matter what the weather outside’s doing:  Siding R-values.

When most homeowners think about siding, they think about aesthetics. And hey, aesthetics are important! But what’s also important is keeping your indoor temperature comfortable all year round – and that’s where the right siding really shines. 

From classic wood to modern fiber cement and insulated vinyl siding, each siding material has its own R-value and unique advantages (and disadvantages). 

So, are you ready to find out which siding has the highest R-value and which one is the perfect fit for your home? Let’s jump right in!


Why R-Value Matters

What is the R-value and why does it matter? Simply put, it’s a measure of thermal resistance – how well a material can resist the flow of heat. The higher the R-value, the better the insulation, which means your home stays warm in the winter and cool in the summer. Not only does this mean more comfort, but also some great energy savings. 


The Highest R-Value Siding Is… 

You probably want the answer straight away, right? Don’t worry, I won’t make you wait. So, the siding with the highest R-value is…Insulated vinyl siding. 

With an impressive R-value of up to 2.7 per inch, insulated vinyl siding is a standout. 

This material combines the affordability and ease of vinyl with a layer of insulation attached to the back of the siding. 

It offers the best of both worlds: excellent insulation and cost-effectiveness, perfect for our Maryland and Virginia homes. It also is low-maintenance and comes in a range of colors and styles. 

So, if you’re after the best siding, we’d highly recommend insulated vinyl siding. 

However, insulated vinyl siding might not work for everyone. For one, it’s susceptible to warping under extreme heat, so if you live in a particularly hot climate, you might need to consider an alternative. 

Also, if having eco-friendly siding is important to you, you might not enjoy the fact that insulated vinyl siding is not so environmentally friendly due to its plastic composition.

Everything has its pros and cons, which is why I always recommend you speak with a professional siding contractor to find the perfect siding fit for your home. Below, I’ve highlighted some other popular siding materials, as well as their pros and cons, so you can determine the best siding material for your needs. 


Siding Materials Compared: Pros & Cons 

When it comes to siding materials, we’re spoiled for choice. But too many choices can be paralyzing! So, let’s take a look at some common ones and their R-values.

Vinyl Siding

Vinyl siding is a synthetic material made from polyvinyl chloride (PVC). It’s one of the most commonly used siding materials due to its affordability and versatility. It comes in a wide variety of colors and styles, including those that mimic wood grain. Vinyl siding has an R-value of around 0.61 per inch. 


  • Cost-effective and durable.
  • Low maintenance.
  • Available in a range of colors and styles.


  • Insulation properties are average.
  • Can warp or melt under extreme heat.

Wood Siding

Wood siding is a classic choice, loved for its natural beauty and traditional aesthetic. It comes in various styles, including clapboard (or lap or bevel siding), shakes or shingles, and board and batten. Various types of wood are used for siding, including cedar, pine, spruce, and redwood. Wood siding has an R-value of around 0.81 per inch.


  • Versatile and can be customized with paint or stain.
  • Natural and renewable.
  • Damaged sections can be easily replaced.


  • Requires regular upkeep to prevent damage.
  • Higher initial and ongoing costs.
  • Prone to damage from moisture, insects, and fire.


Metal Siding

Metal siding is a broad term that can include a variety of materials, such as aluminum and steel. It’s often used for its durability and ease of maintenance, and it’s one of the best fire-resistant materials. However, its siding’s R-value is about 0.61 per inch, meaning it’s not the best material for insulation.


  • Metal siding is highly resistant to rot, mold, pests, and fire. 
  • Can be recycled, making it a more environmentally friendly option.
  • Once installed, it requires minimal upkeep and can last for decades. 


  • Can be expensive.
  • May not suit all architectural styles.
  • Not the best for insulation.


Fiber Cement Siding

Fiber cement siding is a type of siding that is made from a mix of cellulose fibers, cement, and sand. It is known for its durability and can be manufactured to mimic the look of other materials such as wood, stucco, or masonry, which gives homeowners a wide range of aesthetic options. This sturdy material boasts an R-value of around 0.47 per inch. While it’s great for durability and aesthetics, it falls short in the insulation department.


  • Resistant to fire, rot, and insects.
  • Can mimic various materials.
  • Holds paint well and requires infrequent repainting.


  • Higher material and installation costs.
  • Heavy, possibly requiring additional structural support.
  • Not the most insulating choice.

Read More: What Are the Benefits of Fiber Cement Siding 


Brick Siding

Brick is a traditional and sturdy siding material that has been used for centuries. It’s made from fired clay and offers excellent durability and a classic aesthetic. Offering an R-value around 0.44 per inch, brick is renowned for its classic appeal and durability but isn’t a top performer in insulation.


  • Highly resistant to fire, wind, and moisture.
  • Classic and elegant.
  • Doesn’t require painting or staining.


  • High material and installation costs.
  • Labor-intensive process requiring professional masons.
  • Not the most energy-efficient option.

Read More: What Are the Benefits of Brick Siding?


Stone Veneer Siding

Stone veneer is a great budget-friendly alternative to natural stone, providing an R-value of around 0.41 per inch. It’s made by pouring a mixture of cement into forms of different shapes in a controlled environment, then painted to resemble natural stone.


  • Stone veneer is resistant to wear, decay, and insects.
  • Great aesthetic appeal.
  • Less expensive than natural stone.


  • The insulation value is lower than others.
  • Requires time to maintain the appearance of stone veneer siding.
  • Installation can be complex, potentially leading to higher labor costs.


Need Help with Your Siding Project? Let the WoW Experts Take Care of It 

Choosing the perfect siding for your home is a big decision, and based on all the options, I’m confident in proclaiming insulated vinyl siding the overall winner (in most cases). 

Still not sure which siding is the right choice for you and need a bit of a hand making the best choice? WoW’s got your back. 

We’re here to help you navigate through the options and find the perfect fit for your home. Because it’s not just about looking good – it’s about being energy-smart too.

Get in touch with us for an obligation-free chat about your project. We’re looking forward to working with you! 


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