Types of Insulation - Basic Forms
|Form||Method of Installation||Where Applicable||Advantages|
|Blankets: Batts or Rolls
||Fitted between studs, joists and beams||All unfinished walls, floors and ceilings||Do-it-yourself.
Suited for standard stud and joist spacing, which is relatively free from obstructions.
|Blown into place or spray applied by special equipment||Enclosed existing wall cavities or open new wall cavities;
Unfinished attic floors and hard to reach places
|Commonly used insulation for retrofits (adding insulation to existing finished areas).
Good for irregularly shaped areas and around obstructions.
||Interior applications: Must be covered with 1/2-inch gypsum board or other building-code approved material for fire safety.
Exterior applications: Must be covered with weather-proof facing
Exterior walls under finishing (Some foam boards include a foil facing which will act as a vapor retarder. Please read the discussion about where to place, or not to place, a vapor retarder.)
Unvented low slope roofs.
|High insulating value for relatively little thickness.
Can block thermal short circuits when installed continuously over frames or joists.
||Foils, films, or papers: Fitted between wood-frame studs joists, and beams||Unfinished ceilings, walls, and floors||Do-it-yourself.
All suitable for framing at standard spacing. Bubble-form suitable if framing is irregular or if obstructions are present.
Effectiveness depends on spacing and heat flow direction.
Vermiculite or Perlite
|Not currently used for home insulation, but may be found in older homes|