If you've never installed it, fiberglass is itchy and scratchy and potentially damaging to the eyes, throat and lungs, because tiny fibers will come loose and become airborne. So you are advised to wear a face mask, goggles, long sleeves and gloves, for safety's sake, when handling it. Most construction workers do not. Fiberglass is also the material most used in new home construction, as you can see in the accompanying photos. Urethane and Styrofoam insulations also are widely used in new home construction.
Urethane comes in a wet chemical form that can be injected into walls or cavities with a gun.
It expands as it cures and care must be taken in the application because it can blow out a sheet rock wall, or bow window frames to the point that the window cannot be moved. Both urethane and Styrofoam also come in rigid sheets. They're usually put on the exterior of a building but sometimes on the interior. Most commonly, you're seeing one-inch of urethane installed on the outside. The R- value is quite high.