How to Shut the Door without Noise

Doors that lead directly from the exterior to the interior without an intervening air space or vestibule are major noise paths. As it happens, solid-core wood doors are highly effective at reducing noise energy by virtue of their mass. We typically install 1 3 / 4 -inch wood raised-panel doors with a panel thickness of no less than 1 1 / 8 inches. The maximum area of any glazing in the door can be no more than 50% of the total door area and should be 1/2- or5/8-inch insulating glass.

Secondary Door -The noise-reduction properties of the prime door are significantly enhanced by adding a high-performance storm door outside. “High performance” for leaf-type storm doors is defined as having an air infiltration rate of less than 1 cm per square foot at 25 mph. There should be a minimum 2- inch air gap between doors, which may require a special build-out of the existing door’s casing. The storm door helps reduce noise by virtue of its mass, with the core consisting of 3/ 4 -inch-thick flake board or laminated fiberboard. The door has an aluminum or vinyl skin with various color and applied trim styles. As with the primary door, the maximum size of any glazing should be no more than 50% of the total door area.

Sliding Patio Doors- In the case of a sliding glass door, conditions occasionally dictate installing the sliding storm panel on the interior side of the prime door to provide adequate sill support. Since sliding-door handles project out from the face of the door and may interfere with one another, the space between the doors may have to be greater than 2 inches. An Automatic Sliding Door sweep ensuresa good seal against air and noise infiltration at the threshold.

Gasketing- It is acoustically important that both prime and storm doors are well-gasketed with continuous weather- stripping to minimize air leakage. The weather stripping should create a flexible, shape-conforming, airtight seal between door and frame. Use polyprene or polypropylene bulb weatherstripping because they maintain flexibility longer than other types of weather stripping without stiffening or cracking. With the correct airtight seal, you can feel a vacuum-type resistance when you open the primary door with the storm-door closed, and a compressive pressure when you close it again. Weatherstripping at the threshold, preferably with a flip-down sweep, is equally important.

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