Spray Foam vs. Fiberglass: Which Insulation Is Better?

By History of Simple Things

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Spray foam or fiberglass—which one actually makes more sense for insulating a house? They may both help control heat transfer, but they work in very different ways. In this video, we break down how fiberglass insulation works, why spray foam can also act as an air barrier, the differences between open-cell and closed-cell foam, R-value, moisture, installation, and cost. We’ll also look at why the “best” insulation isn't necessarily the most expensive one—it depends on the building, the space available, and how well the material is installed. From a nearly century-old insulation technology to modern spray-applied foam, here's what separates these two common building materials. Timestamps 00:03 Introduction 00:56 A Brief History of Fiberglass and Spray Foam 02:00 How Fiberglass Actually Works 03:01 What Makes Spray Foam Different? 04:07 Which One Insulates Better? 05:04 Moisture and Air Leaks 05:54 Cost and Installation 06:55 So Which One Should You Use? #SprayFoam #Fiberglass #Insul

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