Not providing for good air circulation between the roof and the insulation
Neglecting to find out the most efficient R-value for your area and insulating accordingly
Installing fiberglass batting with the paper side (vapor barrier) facing toward the outside
Omitting a vapor barrier that prevents the accumulation of moisture between the batting and the underside of the roof
Puncturing the vapor barrier unnecessarily or neglecting to puncture the vapor barrier of the top batt when installing two layers.
Distorting, compressing or squeezing the fiberglass batt insulation out of shape
Using paper-faced batting against a heat source like chimneys, heating ducts, etc.
Neglecting to get into all of the small spaces and corners with the insulation
Covering eave vents with insulation, thereby cutting off ventilation.
Not ventilating properly
Making unnecessary trips up and down the attic stairs during installation. Assemble all tools and equipment in your work area prior to beginning the job.
