Blanket Insulation: Batts & Rolls

  • Blanket Insulations are flexible, bound products made from mineral (glass, rock, and
    slag) or cotton fibers
  • Available in widths suited to standard spacings of wall studs and attic or floor joists
  • Continuous rolls can be hand-cut and trimmed to fit into place
  • Batts are available in a variety of pre-cut lengths
  • Available with or without vapor retarder facings
  • Thickness and density of the insulation varies depending on the Fl-value desired
  • Batts with special flame-resistant facing are also available in various widths for
    applications such as basement walls where the insulation will be left exposed
  • Newer products on the market include plastic-wrapped batts and fiberglass batts
    encapsulated in non woven fabric
  • Fiberglass blanket insulation is made from sand, limestone, and sodium carbonate
  • Fiberglass insulation is usually the least expensive on the market for the insulating
    value achieved
  • Because it is inorganic, fiberglass will not rot or absorb moisture, is non-combustible,
    and does not support the growth of mildew, mold, or fungus
  • Fiberglass does not take up water within the glass fibers, but water vapor passes
    freely through the fibers. Therefore, fiberglass insulation must be used in conjunction
    with a vapor barrier placed on the appropriate side depending on climate
  • Batt and roll insulation is available unfaced or with a facing already attached
  • Batts and rolls come in multiple Fl-values to choose from, we recommend a minimum
    of Fl-38 value insulation
  • The majority of homes in the Bay Area have Fl-19 or less, which is not efficient
  • To acquire a higher Fl-value than is offered you can stack batts or rolls on top of each
    other, or add additional blown insulation over the top
  • Roll or Batt insulation can be used under floors and in crawl spaces