Here are Some Essential Things to Know Before installing Roof insulation

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November 12, 2025

United State has hot weather all year round. Installing insulation under the roof is an effective way to reduce heat inside the house, helping to keep the house cool and save energy in the long run. But before installing insulation under the roof, you should know some important information to ensure the installation goes smoothly and gets the best results. In this article, we will discuss what you need to know before planning to install insulation under the roof so that you can install it more correctly.

What is roof insulation?

Installing insulation under the roof is the installation of materials that have the ability to prevent heat from outside from entering the house, making the house cooler and also reducing the cost of using air conditioning. Roof insulation helps prevent heat from being transferred to other areas of the building or building. The insulation sheets are usually lightweight, making the building have a cooler temperature.

How many methods are there for installing insulation?

There are three main methods for installing insulation : 1) Installing insulation under the roof in two locations: under the roofing sheets and on the ceiling; and 2) installing insulation on the roof surface. Let’s look at the differences between each method so we can understand the differences and choose the most appropriate method.

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1. Install under the roof sheet

Installing insulation under roofing sheets is the most popular method among homeowners. Most people prefer to install insulation under the roof at the same time as building a house. It helps to keep out heat well and also reduces the temperature inside the house and building more than other types of installation.

2. Installed on the ceiling

Installing insulation on the ceiling is a way to reduce heat that passes through the roof into the house. Because installing it on the ceiling reduces heat accumulation in the area under the roof, it effectively cools down the area inside the house. We must use roof insulation that is thick enough and cover it with materials that can prevent moisture.

3. Install on the roof

Next, we will install heat insulation on the roof. This type of installation helps reflect heat. It is often installed in addition to other types of heat insulation panels to effectively prevent heat from entering the building’s roof.

What should you know before installing roof insulation?

Before installing insulation, let’s familiarize ourselves with the types of roof insulation panels. There are several types, such as fiberglass insulation, SCG insulation (Elephant Brand), microfiber insulation, rock wool insulation, and rockwool insulation.

We also need to consider the installation area, the size and thickness of the insulation panels, the materials used for the roof insulation panels, moisture protection, installation costs, and the experience and expertise of the technicians installing the insulation under the roof to ensure safety and effective heat reduction.

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Is it expensive to install insulation under the roof?

Many people may think that installing insulation under the roof is usually expensive, but in fact, roof insulation panels are not expensive at all and can also help save on electricity costs within the home. The price of roof insulation panels starts at 170 – 450 baht, depending on the material and thickness of the insulation panels. For example:

  • Fiberglass insulation starts at 170 – 450 baht
  • SCG insulation (Elephant brand) starting price 330 – 450 baht
  • Microfiber insulation, starting price 160 – 300 baht
  • Rock wool insulation,   starting price 370 – 1,715 baht
  • Rockwool insulation   starts at 370 – 1,715 baht

We can see that installing insulation under the roof is an effective way to reduce heat and save energy in the home. But before installing, you should understand the types of insulation, the appropriate size and thickness, moisture protection, and choosing an experienced installer to ensure a smooth installation and the best results. For anyone interested in installing, you can purchase roof insulation panels from the Attic Kings Website, a one-stop center for ceiling and wall materials, meeting all your needs in one place.

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