Apartments, condos, and townhomes have insulation needs that single-family homes don't — primarily sound control between units and fire separation at party walls. Getting this right affects tenant satisfaction and code compliance.
The wall between two units (the 'party wall') must meet both sound and fire requirements. STC 50+ is typical for building codes. Mineral wool is the preferred product: it provides STC 45–52, is non-combustible (ASTM E119 rated), and doesn't require a separate fire barrier in many assemblies.
Sound transmission between floors is one of the most common tenant complaints. Impact noise (footsteps) and airborne noise (voices, TV) both require attention. Mineral wool batts in floor joists reduce airborne STC; resilient channels and mass-loaded vinyl address impact noise.
Exterior walls in multifamily buildings need to meet energy code — typically R-20 to R-25 for cold climates. In buildings with steel framing, continuous exterior insulation may be required. Fiberglass batts in 2x6 walls plus exterior rigid foam is a common assembly.
Building codes require 1-hour fire-rated assemblies between units. Mineral wool batts combined with 5/8" Type X drywall typically achieve a 1-hour rating. Check with your AHJ (Authority Having Jurisdiction) for local requirements.
Multifamily projects move fast — framers and insulators work floor by floor, and materials need to be on-site when they're needed. We coordinate phased deliveries to match your construction schedule. One call sets up the whole sequence.
R-15 and R-21 mineral wool for party walls, R-30 and R-38 fiberglass for attic/roof, R-19 and R-21 for exterior walls. Available in standard and high-density. Call with your unit count and floor plan and we'll quote quantities.
We supply wholesale fiberglass and mineral wool insulation with next-day delivery across all 50 states. Call us or request a quote online.