Door & Window Details | MediaVerse Acoustic Study v3

Door Positions

ID	Name	Size (cm)	STC	Position	Swing	Location
D1	Entry	90 × 220	50	(434, 0)	N into Editing	south wall, center-right
D2	Control	90 × 220	45	(213.6, 19.9)	W into Control Room (XScale=-1 in DXF)	buffer wall west face
D3	VO Live	80 × 220	45	(123.6, 241.1)	N into VO Live	VO/Control partition
D4	Video Studio	90 × 220	48	(238.6, 189.4)	N into Video Studio	Editing/Video Studio partition, west end
OW-1	Observation Window	80 × 50	50	(47.7, 241.1)	—	VO/Control partition

Door Leaf Construction

Total thickness: 85 mm. Mass-damping-mass sandwich.

Layer	Thickness	Purpose
Steel sheet (outer)	1.2 mm	Structural rigidity + mass
Butyl rubber	1.5 mm	Constrained layer damping (CLD)
MDF	15 mm	Mass layer
Rockwool RWA45	50 mm	Absorption core
MDF	15 mm	Mass layer
Butyl rubber	1.5 mm	Constrained layer damping (CLD)
Steel sheet (inner)	0.8 mm	Structural rigidity (lighter inner face)

Mass-damping-mass sandwich. Asymmetric steel thickness (1.2/0.8mm) prevents coincidence at same frequency.

Frame Specifications

STC 50 Frame (D1 Exterior)

Frame	16 ga steel, welded corners, filled with sand/lead sheet
Jamb Depth	140 mm
Threshold	automatic drop seal + neoprene gasket
Seal	magnetic perimeter seal, continuous compression gasket
Hardware	3x ball-bearing hinges, lever handle, surface closer
Notes	D1 exterior — add weather stripping + threshold rain deflector

CONTRACTOR WARNING — D4 (STC 48)

The architect's drawing shows D4 as STC 40. This has been upgraded to STC 48 by the acoustic engineer. The acoustic specification overrides the architect's drawing. Do NOT install an STC 40 door at D4 — the Video Studio / Editing Suite partition (W7) requires STC 48 isolation to prevent crosstalk between rooms during simultaneous sessions.

Reference: SSOT v3.7 — D4=48(UPGRADED), W7=48(UPGRADED)

STC 45 Frame (D2, D3 Interior) — D4 uses STC 48 frame

Frame	18 ga steel, welded corners, grout-filled
Jamb Depth	120 mm
Threshold	automatic drop seal
Seal	neoprene perimeter gasket, adjustable
Hardware	3x ball-bearing hinges, lever handle, surface closer
Notes	D2, D3, D4 internal acoustic doors

Door Hardware — Acoustic Sealing

STC ratings are meaningless without proper sealing hardware. Every acoustic door requires all three seal types:

Component	Specification	Function
Automatic drop seal	Concealed mortise, silicone bulb, spring-loaded	Seals the 3-5mm gap between door bottom and threshold when door closes
Perimeter gasket	Continuous magnetic or compression seal, 3-sided (head + both jambs)	Maintains airtight contact around the full door perimeter
Threshold transition	Adjustable aluminum saddle with neoprene insert	Bridges float-floor gap, provides drop-seal landing surface
Door closer	Concealed overhead, adjustable closing force and latch speed	Ensures door fully closes and seals engage — doors left ajar destroy STC

Observation Window OW-1

Opening	80 × 50 cm
STC	50
Position	(47.7, 241.1)
Sill Height	100 cm from floor
Tilt	5° (prevents internal reflections)

Glass Panes

Layer 1	6mm float
Layer 2	100mm dry air
Layer 3	10mm laminated
Layer 4	75mm dry air
Layer 5	8mm float

Maintenance Schedule

Inspection interval: Annual (minimum), or after any physical impact

Seal Checks

Perimeter gaskets: check for compression set, cracking, or gaps — replace if any light visible
Drop seals: verify full contact with threshold when door closes — adjust or replace mechanism
Threshold gaskets: inspect for wear from foot traffic — D1 exterior threshold especially
Magnetic seals (D1): verify magnetic strip alignment and pull force > 2 kg/m

Closer Checks

Door closer: verify latching force pulls door fully into seal contact
Hinge pins: lubricate annually — squeaking indicates wear that may cause staff to prop doors open
Closing speed: 3-5 seconds from 90deg to latch — too fast = slam damage, too slow = left open

Warning: Propping acoustic doors open during sessions destroys all isolation. Consider magnetic hold-open devices that release on studio 'LIVE' signal.