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How Much Insulation Do I Need?

spray foam insulation

How Much Insulation Do I Need

There is no simple answer to the question: ‘how much insulation do I need?’ First of all, it depends on where you live. And it also depends on whether you are installing insulation in a new house, or if you are trying to squeeze insulation into an existing house instead.

The best way to answer the question “how much insulation do I need” is to consider R-values. These determine a material’s effectiveness at retaining heat.

Still confused? Let us explain R-values and their importance in greater detail…

Why R-values Matter

Every insulation product has its own R-value. The R-value is always displayed on the packaging.

Now, measuring and calculating how much insulation you need can be tricky. However, there are some general rules you need to follow.

In general, people living in colder climates need insulation with higher R-values, while those in warmer climates need materials with lower R-values. According to the Department of Energy, these are the R-values you need to follow:

– For hot climates, you need R-value of 30

– For cold climates, you need R-value of 49

– For moderate climates, you need R-value of 38

Where Should You Insulate?

How much insulation do I need is not the only question you need to answer. You also need to consider which areas of your home need insulation.

For starters, you need to insulate the walls. Walls are your first line of defence against heat and cold.

Roof insulation is your next challenge. Just remember, roofs need to be sealed prior to insulation. When you consider roof insulation, always look for a professional who will make sure there are no cracks and holes.

Some not so familiar areas that also need insulating include: the garage doors, windows, and side doors.

Last, but not least, your crawl space requires different insulation, depending on whether it is ventilated or not. Make sure to remove all moisture prior to installation.

Again, a professional will ensure that there’s no moisture, which inevitably leads to mould.


Spray Foam Insulation Formula

Using spray foam, there is a simple formula. Here are the steps you need to take:

  • Measure length and height of the walls you need to fill. The formula is Length x Height
  • Subtract the square feet of doors and windows that are located on that wall
  • Subtract 6% for the studs
  • Multiply that total by 3.5” for a 2×4 wall and 5.5” for a 2×6 wall

The result you get is the number of board feet spray foam you need for a complete insulation



Why Spray Foam Insulation is Best

When you consider insulation for your home, there are many different products you can use. One of the most commonly used products is fibreglass.

However, fibreglass is not as effective as spray foam. In fact, in recent years, spray foam has become one of the most effective insulation products on the market.

Spray foam has been used for more than 30 years, but in the last 10 years, spray foam has advanced and manufacturers perfected the process. Here are some benefits of spray foam insulation:

  • Spray foam is a powerful insulator that has an expansive nature, sealing all holes, nooks and crannies.
  • Spray foam helps you reduce your energy bills by 50%
  • Spray foam is a moisture barrier. Closed cell spray foam does not absorb water, meaning that you will protect your home not only from air leakage, but mould as well
  • Spray foam is 24 times less permeable to air infiltration than any other type of insulation
  • Spray foam has a virtually indefinite lifespan. Spray foam will last for at least 20 years, possibly even more. In other words, once you install spray foam insulation, you are set for life
  • Last, but not least, spray foam is eco-friendly, helping you reduce your carbon footprint considerably