For years, fiberglass batt insulation has dominated the market. While fiberglass insulation can do a good job of isolating your home from the outside world, there are other options on the market. Spray-foam insulation, in particular, can perform in ways that fiberglass insulation won't.
Batts come as limp slabs of material. Trying to install these batts between the studs in your walls or ceiling can be tricky, and even with drywall in place, some sagging can happen. As your insulation settles over time, gaps can develop at the tops of your walls. Without a solid barrier against the cold, you lose some of your energy efficiency. Blown insulation can likewise settle over time, but spray-foam insulation creates a solid foam barrier, which will not sag or settle. Thus, you don't have to worry about gaps forming down the road when you use spray-foam insulation.
When you have oddly shaped corners or tight spaces, it can be difficult to cut fiberglass to fit. Blown insulation does a much better job of filling gaps in your ceiling, but gaps in your walls can be tricky. Because spray-foam starts as a liquid, it is easy to direct a jet of liquid into a narrow gap between two studs or other hard-to-insulate areas. The foam will rapidly expand as it solidifies and fill spaces that blown insulation or batts might not. Thus, with spray-foam insulation, you get a much more solid barrier against the outside temperature.
Insects can easily cut off pieces of cellulose (blown insulation) to carry to a nest. The same is true of fiberglass insulation. Thus, over time insects may carve holes in your insulation barrier. They might even set up camp within the walls of your home. In contrast, insects will not be able to carve off pieces of foam insulation, so you don't have to worry that your insulation has been compromised by a host of marauding insects.
In terms of installation costs, your most expensive option is spray-foam insulation. On the other hand, if you have an ineffective barrier against the cold, you can end up paying for your inferior choice month after month by way of your heating and cooling bills. In the case of insulating your home, you have to be willing to spend money to save money. If you can handle the higher installation cost, you can improve the energy efficiency of your home and keep your future costs down.
For more information about spray foam insulation, visit BIOS Environments.