Fiberglass Insulation in Great Falls, VA

Fiberglass remains the most cost-effective insulation system for many Great Falls projects, particularly when budget control or code-minimum compliance is the priority. We install it in three forms: cut-to-fit batts during framing-stage remodels and additions, BIBS netted dense-fill for closed walls in older homes, and blown loose-fill for estate-scale attics where deep, even coverage is required across thousands of square feet. The choice depends on the assembly. For a brand-new addition along Georgetown Pike where speed and code R-value matter most, batts beat any other system. For a 1970s farmhouse near Riverbend with closed walls full of wires and unknown framing, BIBS reaches every corner without lifting drywall.

BIBS for Closed Walls, Loose-Fill for Large Attics

The Blown-In Blanket System (BIBS) is the right answer for Great Falls homes built between 1955 and 1990, where original wall insulation was either skipped or installed inconsistently. Our crews staple netting to the cavity face, then blow fiberglass to a verified 1.8 to 2.0 pcf density. The result is a custom layer that touches every surface, surrounds wires and outlets, and delivers full rated R-value across the entire wall. In large estate-scale attics, blown loose-fill at 14 to 16 inches reaches R-49 evenly across joists. We use raised storage platforms where decking is needed so insulation depth is never crushed and rated covers at any recessed lights penetrating the attic floor.

Code R-Values, Ventilation, and Fairfax County Documentation

Great Falls falls within Fairfax County and Climate Zone 4A under the IECC, which sets minimums of R-49 in attics, R-13 to R-15 for 2x4 walls, and R-21 to R-23 for 2x6 walls. We meet or exceed these targets, with documentation submitted for the IECC inspection. Bath fans are confirmed to vent outdoors, recessed lights receive rated covers or safe clearances, and soffit baffles maintain attic ventilation channels so assemblies dry as designed. Low-VOC and formaldehyde-free fiberglass products are available on request for indoor air quality sensitive Great Falls projects, and kraft facings are oriented per the assembly's vapor strategy.