How to Soundproof a Generator

DIY generator enclosures are commonly built from plywood, plastic storage containers, or metal boxes. Each option behaves differently acoustically, but all must be oversized enough to allow airflow around the generator and accommodate soundproofing materials.

Ventilation must be planned before construction. Intake and exhaust paths should never form a straight line from inside to outside, as this allows sound to escape easily.

The soundproofing materials you install should be chosen based on how your enclosure is built, since plastic, wood, and metal boxes all interact with sound differently.

Plastic Enclosures (Lightweight Boxes)

Plastic enclosures lack mass, allowing sound to pass through easily. Adding Luxury Liner Reinforced MLV Roll increases wall mass and improves sound blocking without significantly increasing enclosure size. Coverage should be continuous, while keeping ventilation openings clear.

Plywood or MDF Enclosures

Wood enclosures provide some mass, but sound reflects heavily inside the box. Lining the entire interior with BlocknZorbe reduces reflected noise while adding additional sound blocking, keeping more generator noise contained inside the enclosure.

Metal Enclosures

Metal panels easily vibrate and re-radiate sound. Begin by applying Damplifier Pro directly to the metal surfaces to control vibration. Once treated, install BlocknZorbe over the Damplifier Pro to add sound absorption and additional blocking.

You can also use our Generator Box Soundproofing Kits to get all the raw materials you need to soundproof a metal enclosure. These are popular picks for campers!

After soundproofing materials are installed, verify that all major interior surfaces are treated and that airflow paths remain unobstructed. Sound control should never compromise cooling or exhaust flow.

If you don’t want to build an enclosure, or if one isn’t possible for your setup, redirecting sound can still help reduce perceived generator noise. Building a three-sided soundproof fence, and optionally adding a roof, can block and deflect sound away from recreational or living areas when the open side is aimed away from people.

This approach can also be used in addition to a generator enclosure for even better results. Redirecting sound that escapes ventilation openings or door seams helps further reduce noise reaching nearby structures or activity areas.