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Build 06 — Acoustic Doors & Magnetic Seal

Certified door SETS (IAC/AKINCO): set frame, hang leaf, magnetic + drop seals · click any drawing to zoom · acoustics5

What you need

1
Acoustic door SETS (STC 50/45/45/48) · D-01..D-04
Qty: 4
Complete certified sets — leaf+frame+seals
2
Steel frames + thresholds · DH-03
Qty: 4 sets
Grout-filled, welded
3
EPDM perimeter seals + auto drop seals · DH-01/02
Qty: 5/5
Magnetic perimeter + drop seal at sill
4
Non-hardening acoustic sealant · —
Qty: 1 lot
Frame-to-wall perimeter (never foam)

Detail — magnetic seal (click to zoom)

ROOM SIDE (door swings here) WALL / FRAME (fixed) magnet pulls leaf to keeper → positive even contact on close DOOR LEAF — asymmetric composite: steel / butyl / MDF / RWA45 core / MDF / butyl / steel Magnetic gasket — embedded in the leaf leading edge (head + both jambs) Steel keeper strip — in the frame stop (the magnet pulls to it) Neoprene compression backup 18 ga steel frame — welded, grout-filled Non-hardening acoustic sealant frame→wall (NOT expanding foam) Wall: W6 — 150 mm decoupled studs (≈ 200 mm)

Build sequence

1
Set & plumb the steel frame

Shim the frame perfectly plumb/square and lock to studs — the magnetic seal only compresses against a true frame.

2
Grout-fill the frame

Fill the frame solid (no voids) and cure — mass + rigidity hold the keeper steady.

3
Seal frame-to-wall

Non-hardening acoustic sealant on the full perimeter. Never expanding foam.

4
Fit the steel keeper strip

Continuous keeper on head + both jambs, aligned to the leaf's magnetic gasket; mitre at corners.

5
Hang the leaf

3 ball-bearing hinges (100kg); adjust so the gasket meets the keeper evenly top-to-bottom.

6
Adjust the magnetic gasket

Set projection so the magnet makes full contact along its length — a soft pull/click on close.

7
Set the drop seal

Automatic drop seal contacts the threshold across the full width on close; keep its travel path clean.

8
Verify (HOLD POINT)

Paper-drag continuous on 3 edges, audible click, full-width drop seal, no light leak from a dark room.

Golden rule: The seal IS the performance for an opening. A perfect leaf with a leaking perimeter fails — verify continuous magnetic contact + full-width drop seal (light test).