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ACOUSTICAL SEALANT CHOICES
AIR BYPASS LEAKS
AIR LEAK SEALING PROCEDURE
AIR TEST FOR MOLD: ACCURACY
ALLERGEN TESTS for buildings
ALLERGENS in BUILDINGS, RECOGNIZING
ANIMAL ALLERGENS / PET DANDER
ANIMAL ENTRY POINTS in buildings
APPLIANCE EFFICIENCY RATINGS
BLOWER DOORS & AIR INFILTRATION
BLOWER FAN CONTINUOUS OPERATION
BLOWER FAN OPERATION & TESTING
BUCKLED FOUNDATIONS due to INSULATION?
BUILDING NOISE DIAGNOSIS & CURE
CARPET PADDING ASBESTOS, MOLD, ODORS
CARPETING, SELECTION & INSTALLATION
CATHEDRAL CEILING VENTILATION
CHIMNEY INSPECTION DIAGNOSIS & REPAIR
COMBUSTION AIR for TIGHT buildings
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
ENGINEERED WOOD Flooring
FIREPLACES & HEARTHS
FLOOR TYPES & DEFECTS
FRAMING DETAILS for BETTER INSULATION
FREEZE-PROOF A BUILDING
FROST HEAVES, FOUNDATION, SLAB
HEAT LOSS in BUILDINGS
HOUSE DOCTOR, how-to be
INDOOR AIR QUALITY IMPROVEMENT GUIDE
Insulation Air & Heat Leaks
INSULATION LOCATION - WHERE TO PUT IT
INSULATION R-Values & Properties
LOG HOME GUIDE
MOISTURE CONTROL in BUILDINGS
MOLD: A COMPLETE GUIDE TO MOLD
NOISE / SOUND DIAGNOSIS & CURE
ODORS & SMELLS DIAGNOSIS & CURE
PLASTER, LOOSE FALL HAZARDS
PLASTER TYPE IDENTIFICATION
PLUMBING DRAIN NOISE DIAGNOSIS
PLUMBING NOISE CHECKLIST
ROOF NOISE TRANSMISSION
ROOF VENTILATION SPECIFICATIONS
SLAB CRACK EVALUATION
SOUND CONTROL in buildings
Splits in Structural Wood Beams
STAIRS, RAILINGS, LANDINGS, RAMPS
SUMP PUMPS GUIDE
THERMAL EXPANSION of HOT WATER
THERMAL EXPANSION of MATERIALS
TRUSS UPLIFT, ROOF
VENTILATION in BUILDINGS
WALL FINISHES INTERIOR
WIND WASHING INSULATION At EAVES
WINDOWS & DOORS
WOOD FLOOR DAMAGE
Building noise control - flanking pathways: this article explains how sound flanking paths, sound leaks around and through building components, defeats incomplete attempts to reduce building sound transmission and noise levels. We include design details for sound reducing details in buildings including soundproof office doorways and doors. This article includes excerpts or adaptations from Best Practices Guide to Residential Construction, by Steven Bliss, courtesy of Wiley & Sons.
Green links show where you are. © Copyright 2013 InspectAPedia.com, All Rights Reserved. Author Daniel Friedman.
The page top photograph shows a pair of solid core doors installed at the entry to an office where sound transmission and privacy are a concern. Below we provide more details about soundproofing at doorways. Continuing from from Best Practices Guide to Residential Construction:
Sound takes the path of least resistance between rooms, through any air leaks or through rigid connections in the structure itself. These routes that bypass efforts at sound insulation are called flanking paths. These can significantly reduce the effectiveness of soundproofing efforts. Building walls with high STC ratings will do little good if sound can pass easily though electrical outlets or a thin, loosely fitting door.
For example, an ungasketed door or the equivalent of a one-inch-square hole in a wall can reduce an STC 50 wall to STC 30. Common flanking paths include:
Minimizing sound noise transmission flanking paths requires both good planning and workmanship. Common strategies to control flanking path for noise in buildings include:
As described in Best Practices Guide to Residential Construction:
Soundproof doorways: Upgrade to solid-core doors and add weather-stripping. Our photo (left) shows an installation of doubled solid core doors that has been found effective in minimizing sound transmission between a counseling office and its waiting room.
Addressing obvious flanking paths is often the most cost-
effective step in soundproofing a home.
In general, sound-resistant doors should be within 10 Sound Transmission Class (STC) points of the surrounding wall. Solid-core doors are recommended for bedrooms and bathrooms.
Where higher-level sound isolation is required, you will need to add high-quality gasket-type weather-stripping and a sealed threshold.
Also the gap between the door jamb and studs should be caulked or grouted to avoid sound leaks around the door.
A doubled sound transmission resistant interior door installation is shown at Cut Off Flanking Sound Paths.
For even higher sound resistance ratings, which might be needed for a music room, for example, double doors are required (see our Table of Sound Transmission Characteristics of Interior Doors shown at left). You can see from the table "Sound Transmission of Interior Doors" that the example in our photo above, two solid core doors spaced 3-inches apart gives the best STC rating in both unsealed and well sealed installations.
-- Adapted with permission from Best Practices Guide to Residential Construction.
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