How to install FanFold Insulation- Stuff that makes sense!

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My name is Clemence and I have a soft spot for tomatoes, fresh flowers, and all living creatures (except spiders. Spiders are my nemesis). I am terribly, indecently, passionately curious. I have a sometimes simple, sometimes complex, and usually self-contradictory personality and an unfortunate tendency to daydream. Oh the lovely things is a catalog of various treasures- objects, ideas, people, works of art. It's the place where I share my love for independent talents and creative people, add pretty wearables to my imaginary wardrobe, get my craft on, and a lot of other random things.


FanFold insulation is one of the major underlying instruments for home insulation. Many of you are well aware of this fact.

What many of you don’t know is how to get started with the installation process.

Well, that’s not entirely your fault.

More than 80% of the people would try and seek some sort of professional help before getting started. And let’s face it, why would want to sweat in the grueling heat when you could just pay someone to do it for you.

We’re sure the diy enthusiast among you are feeling a bit agitated by now.

You don’t need to be!

Because throughout the course of today’s content, we will try and explain how to get the job done all by yourself. But there’s a catch.

We will not get into all the shenanigans in detail. But we will provide enough information for you to conduct your own research and do a thorough job. 

Let’s get started with the very basics.

How does insulation really work?

The principle of insulation is very easy to understand.

The goal of roof insulation (which is the most common) is to trap the heat inside the home during the chilly winter days.

Air is a very bad conductor. And the insulation process takes advantage of this.

When roof insulation is in place, it works like a barrier that doesn’t let any heat past it. As air is a bad conductor, the possibility of heat leaking out is low. And as there is insulation in place, the conduction process is limited as well.

Add these two things together and you have an insulation system that works!

FanFold Insulation: The quality and use case

The FanFold underlayment insulating material is a product of Plasti-Fab. It’s essentially an underlayment.

The purpose of the underlayment is to protect the inside of a structure by not letting dirt and debris get in. It’s like putting on a protective seal before putting on the vinyl siding (which is the main purpose of FanFold underlayment 90% of the time).

It’s got an Expanded Polystyrene insulation core with sleek lamination on both sides. The sides have grid lines, which come in handy during installation.

It comes in ½-inch and 3/8-inch thickness. The typical area coverage is 4×24-feet, where a 192-square feet coverage is rated.

Among some of its core features and benefits, the following standout:

  •          The flatness of the design overall is very uniform.
  •          It doesn’t slide off the surface, which is nice.
  •          The ease of use is on point.
  •          It’s one of the more lightweight options out there.

Applications of FanFold Insulation

We will now try and breakdown the applications of FanFold insulation.

As a roof underlayment

It’s got multiple advantages when being used as roof underlayment. Apart from the quick and easy installation, the membrane itself offers a lot of unique features.

For instance, the EPS insulation acts as a solid shield for roofs. Also, the laminated sides hold any damaging effects from the sun.

Protective boarding and Re-siding

The protective properties of FanFold insulation are very solid compared to some of the more extravagant options out there. Although it’s not the best by any means, it still does a good job of holding against water leakage and more.

Also, if you need any shielding from the outside debris, then the FanFold underlayment can take care of that as well.

Another application of the FanFold is its ability to hold on to the aesthetics of the house. Once you have it on, there’s very little chance of damage and leaking, which is a very good thing.

Let’s say you want to sell your house and move to another location. In that case, all you have to do is change the siding and put new ones over the FanFold. That’s all you need to do. 

How to install FanFold insulation: The way it’s done

It’s time for us to show you how you can install FanFold all by yourself.

But before that, let’s take a look at vinyl-siding.

Insulated Vinyl Siding

You get two advantages with insulated vinyl siding. One, you get an increase in the overall efficiency, which is basically a healthy jump in the R-value. Two, this type of insulation also wraps around the siding, which is crucial for keeping the beauty of the home intact.

Whenever you’re dealing with vinyl siding, you will find FanFold to be close by. The reason is simple-professionals like to use this underlayment with vinyl siding for the best possible results.

So, how do you install FanFold?

Step one: Don’t start work on a windy morning

It is possible to lose composure if you don’t have the proper weather. So, we would ask you to start working on a day with no wind.

Step two: Line up and staple

All you have to do now is take a sheet from the stack and start from the top. Try to be as gentle as you possibly can.

As you lay it down, staple it to hold it in place.

Step three: Continue with step two until you reach the end of the roof

Keep unfolding sheets and stapling it to the base. Do this till you get to the very edge.

Step four: Cut, Angle, Place, Staple, and Repeat

Keep applying the sheets to the desired locations. Cut out the excess as you move on to the doors and windows.

Try and cut the sheets to proper angles wherever needed. Also, apply to the gable ends if the attic isn’t heated. This will ensure that there are no leaks.

And that’s basically all there is to understand.

Final Thoughts

We know, it’s been a bit exhausting for many of you. Also, the steps on how to install fanfold insulation seem almost too easy.

First of all, if you’ve taken in all the information, then you’re pretty much ready to do your own research. Second, the steps need mastery, which will come to you naturally after a while.

We think we should stop it here for today.

Stay with us to find out more about the matter. Cheers! 

Check other resources related to home improvement :

1.  The Right Way to Plan Bathroom Remodeling (Things to Consider)

2. 10 Effective Ways to Organize Your Garage

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