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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
KITCHEN VENTILATION DESIGN
LOG HOME GUIDE
MOISTURE CONTROL in BUILDINGS
MOLD: A COMPLETE GUIDE TO MOLD
NOISE / SOUND DIAGNOSIS & CURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
PLASTER, LOOSE FALL HAZARDS
PLASTER TYPE IDENTIFICATION
PLUMBING DRAIN NOISE DIAGNOSIS
PLUMBING NOISE CHECKLIST
ROOF NOISE TRANSMISSION
ROOF VENTILATION SPECIFICATIONS
CONCRETE SLAB CRACK EVALUATION
SOUND CONTROL in buildings
SPLITS & CRACKS 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.
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Definition of flanking transmission or flanking sound transmission
Definition of flanking transmission or flanking noise transmission: the term flanking transmission in acoustical engineering is used to describe the passage of sound over, under, or around barriers intended to provide sound or noise control or isolation.
For example if sound-transmission-resistant partitions have been constructed between rooms but there are openings at the partition wall top (perhaps through a suspended ceiling) then sound control may be ineffective as sounds can pass over the intended noise barrier.
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 flanking transmission pathways can significantly reduce the effectiveness of soundproofing efforts. Building walls with high STC ratings (SOUND TRANSMISSION CLASS RATINGS) will do little good if sound can pass easily though electrical outlets or a thin, loosely fitting door.
For example, an un gasketed door or the equivalent of a one-inch-square hole in a wall can reduce an STC 50 wall to STC 30.
Checklist of Common Flanking Transmission Pathways in Buildings
Our photo (left) shows a sneaky flanking noise path - an under-cut door to a room used for massage treatment. Even though the door is solid wood, gaps around the door and the especially wide gap below the door provide a flanking noise pathway.
Common flanking paths include:
How to minimize Flanking Transmission of Noises
This topic has been moved to SOUND CONTROL for DOORS.
-- Adapted with permission from Best Practices Guide to Residential Construction.
Continue reading about methods for sound control in buildings by using the links provided just below or at the "More Reading" links at the bottom of this article .
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