Stucco, which was once a popular exterior design in the Mediterranean, has spread all over the world. Many homeowners love its unique architecture, as well as its durability.
If you’re interested in having stucco on your home’s exterior siding, there are two choices you’ll need to make – either have the stucco on the block or the frame of your house.
Both options have their pros and cons. And if you’re stuck choosing between the two, I’ll be taking you through the key differences between stucco on the block versus stucco on the frame.
Let’s start by defining both concepts;
What is Stucco on Block?
As the name suggests, this is when stucco is applied directly to concrete blocks. Stucco and concrete bond well. Therefore, this is the most conventional method of applying stucco to a home.
Stucco on block tends to be pretty durable if done well. And can withstand the harshest of climates.
What is Stucco on Frame?
This is the other method of applying stucco which isn’t very popular. It entails applying stucco over the frame of your home.
Because these two materials don’t bond easily, you’ll need to use a metal lath to give the stucco something to bite onto.
Stucco on frame is more problematic to install and there is a risk of running into several issues, which I will discuss in detail later on.
Stucco on Block vs Stucco on Frame (How Are They Different?)
I’m sure this is the part you were eagerly waiting for. Now that you know about both methods, let’s dig a little bit deeper into the differences;
• Stucco on Block is More Durable and Lasts Longer
Out of these two methods, stucco on a block will last way longer than its counterpart. The thing is stucco and concrete bond well. As a result, they can last for decades.
With stucco on a frame, the bond isn’t as strong, and it’s therefore susceptible to damage. If you’re interested in a setup that will serve you for years, go for stucco on the block.
• Stucco on the Frame Needs More Maintenance
Unfortunately, stucco on the frame needs more maintenance than stucco on the block. The frames of most homes are built out of wood which can be infested by termites or mold.
Therefore, to keep these elements at bay, you’ll find yourself engaging in a lot of maintenance with stucco on a frame.
• Stucco on the Frame is More Susceptible to Water Damage and Rot
Also due to the wooden frame behind the stucco, this design can easily be affected by water damage. For those who are familiar with stucco, they can testify to how porous it is.
When water seeps through stucco and finds a wooden frame, it will accelerate rot and impact the structural integrity of the walls.
• Stucco on the Frame is More Difficult to Install
We’re living in an era where most people prefer a DIY approach. If you’re the one installing the stucco, I can confirm that this task will be much easier on concrete blocks than on a frame.
On concrete blocks, you only need to start with a scratch coat followed by extra layers of stucco and it will stick just fine.
As for wooden frames, you’ll need a metal lath and additional material like building paper or house wrap. The more materials are needed, the more complex the installation will be.
• Stucco on Frame is Safer in Earthquake Prone Areas
Even though stucco on the frame seems to have more drawbacks, it’s safer for homes that are built in earthquake-prone areas.
Stucco on the frame is more accommodating of structural movements. And even if the intensity of an earthquake is high, occupants are safer with plain stucco walls than concrete blocks.
• Stucco on Block is More Acceptable By Local Building Codes
With stucco on the block, you’ll have an easier time with the building inspector. However, the same can’t be said for stucco on a frame.
Unlike stucco on a block which is a widely accepted building concept in most parts of the world, stucco on a frame is surrounded by lots of complications.
As a result, building inspectors always find flaws in stucco on the frame. Such issues can prolong the construction duration. and if you are in a hurry to occupy your premises, you’re better off with stucco on the block.
• Stucco on Block is More Stable
Concrete blocks will always be more stable than a frame. There is no argument against this. Stucco on block creates structurally sound walls which aren’t prone to movements.
As for the stucco on the frame, you can expect movements because there is no stability.
Pros of Stucco on Block
• The application process is easier
• Guaranteed durability
• Concrete blocks experience minimal movements
• You don’t have to worry about regular maintenance
• It’s less vulnerable to cracking
• Stucco adheres better to concrete blocks
• A home with stucco on the block has a high resale value
• Better fire resistance
Cons of Stucco on Block
• Concrete blocks do not offer room for flexibility
• Repairing stucco on the block isn’t easy
• The initial cost is a bit higher
Pros of Stucco on Frame
• Improved energy efficiency
• Better flexibility in terms of design and architecture
• Better sound insulation
• It increases property value
• It enhances the fire resistance of the frame
Cons of Stucco on Frame
• The movements of the frame can easily lead to the cracking of stucco
• The installation process is super difficult and time-consuming
• You may need to hire professional help
• It doesn’t last long
• Moisture can penetrate stucco and damage the frame
• Such a setup has a higher risk of stucco efflorescence
Similarities Between Stucco on Block and Stucco on Frame
It wouldn’t be fair to only list the differences, yet there are several similarities between these two concepts. So, here are some of the things stucco on the block has in common with stucco on the frame.
• Both projects need stucco. Whichever method you settle for, you’re going to need stucco. Don’t forget that in the two approaches, you’ll need to apply several layers of stucco which include a scratch coat, brown coat, and a finish coat.
• Whether it’s on a frame or concrete blocks, stucco provides a durable and aesthetically appealing exterior finish.
• You’ll need to install a moisture barrier in both stucco on the block and stucco on the frame. The reason behind that is stucco’s porous nature. A moisture barrier prevents water from seeping through.
• Even though stucco on the block is much easier to install, both approaches require professional installation. If mistakes are made, both designs are susceptible to cracks and delamination.
• Whatever stucco is used, you can expect benefits such as improved thermal and sound insulation, better aesthetics, and fire resistance.
Stucco on Block vs Stucco on Frame: Which is Better?
From a professional point of view, I highly recommend stucco on the block. I have a few reasons as to why I’ve chosen stucco on the block.
First of all, these two materials create a strong bond during installation. That means stucco on the block will last for many years.
The other thing is that concrete blocks create a stable, uniform, and structurally sound substrate for stucco application. This results in maximum durability.
I understand the initial costs may be higher than stucco on the frame, but you get better value with stucco on the block and don’t forget that it will boost your property’s resale value.
Also, if you go through the above article carefully, you’ll realize that stucco on a block has more benefits than stucco on a frame.