Customer focused services
K. Guller Insulation controls mechanical system noise — the hum, rumble, and rush that ducts and pipes carry into occupied rooms — using acoustic duct liner, pipe and duct lagging (mass-loaded vinyl over absorptive insulation), and mechanical room treatments. This is noise control for building systems, not architectural wall soundproofing. We serve hospitals, schools, offices, hotels, and multifamily projects across Pennsylvania, New Jersey, and Delaware.
Fan and airflow noise traveling inside the duct into rooms → acoustic duct liner absorbs it along the run
Rumble radiating through the duct wall itself, common near rooftop units and in exposed-duct spaces → lagging (barrier + absorber) over the duct exterior
Drainage “waterfall” in stacks above quiet rooms, pump pulsation, steam PRV hiss → acoustic pipe lagging
Plant noise bleeding into adjacent occupied space → equipment lagging and room treatment
The distinction that saves money: liner treats noise inside the duct; lagging treats noise radiating off the duct or pipe. Specifying the wrong one is the most common acoustic RFI we see.
Acoustic lagging is a two-part field-applied assembly: an absorptive layer (fiberglass or mineral wool with a decoupling face) against the pipe or duct, covered by a heavy barrier layer — typically 1 or 2 lb/sq ft mass-loaded vinyl or a reinforced foil-faced barrier — sealed at all seams. The absorber kills the resonance; the mass blocks transmission. Properly lagged sanitary stacks and RTU ducts routinely drop perceived noise from “tenant complaint” to unnoticeable.
We work from the acoustical consultant’s report where one exists, and from the complaint where one doesn’t.
Find answers to common questions about our services, processes, and how we work with clients across various industries.
Liner is absorptive insulation inside the duct that quiets noise traveling in the airstream; lagging is a barrier-plus-absorber wrap outside the duct that blocks noise radiating through the duct wall. Different problems, different fixes.
Yes — acoustic pipe lagging (absorptive insulation under a mass-loaded barrier) on the stack and horizontal runs is the standard retrofit and can usually be done from the accessible side of the ceiling.
Only partially. Fiberglass absorbs some energy but has almost no mass; blocking transmission requires the heavy barrier layer, which is why lagging pairs both.
Our scope is mechanical systems — ducts, pipes, and equipment. Architectural wall/ceiling assemblies belong to the drywall trade, and we coordinate with them where scopes meet.
K. Guller Insulation installs duct liner and acoustic lagging on commercial projects across eastern PA, NJ, and DE. Call (610) 941-9394.
