Does your attic insulation look like this? insulation wrong Heat loss through and around ceiling joists.

This is proper insulation! insulation right No heat loss through ceiling joist.

heat loss pie chart

Heat is lost from most buildings as indicated:

  • 10% Air leakage and infiltration
  • 23% Windows & Doors
  • 27% Walls
  • 40% Ceilings

types of insulation

CertainTeed Kraft-Faced Fiberglass Insulation is ideal when a vapor barrier is needed for attic, exterior walls, floors or crawl space.

Big L Lumberland stocks thicknesses of 3-1/2", 3-5/8", 6", 10" and 12" in widths of either 15" or 23". (Not all sizes available in all widths.)

  • 3-1/2" R-Value is 11
  • 3-5/8" R-Value is 13
  • 6" R-Value is 19
  • 10" R-Value is 30
  • 12" R-Value is 38


Dow Styrofoam Sheathing has superior moisture resistance, contains no fiberglass, so no itch, and offers unbelievable strength.

Big L Lumberland stocks 4' x 8' sheets in 3/4", 1" and 2" thicknesses.

Nu·Wool Cellulose blown-in Insulation resists fire, moisture and rodents. Nu-Wool insulation is also a good sound deadener (blower rental available).