Views: 0 Author: Site Editor Publish Time: 2026-01-28 Origin: Site
If you’re installing a Lead Door, you want two outcomes. Smooth operation. Zero shielding gaps.
We’ll walk through planning, handling, hanging, and checks. Use it for new rooms. Use it for upgrades.
Quick safety note: Some lead-lined door builds get extremely heavy. Plan lifts, routes, and controlled moves. Don’t “muscle it”.
Best for:
X-ray, CT, radiology, dental imaging, cath labs, nuclear medicine zones.
Single swing openings, pairs, sliding systems, retrofits.
Pre-hung door sets or slab-only replacements.
You’ll learn:
How we stop “shine-through” at jambs, head, meeting stiles.
How we set a frame plumb, square, level under real load.
How we handle overlaps at wall shielding, frames, openings.
How we finish pair doors using an astragal strategy.
If you want product or project support, visit www.st-shield.com.
Field flow chart Plan shielding → Verify opening → Set lead-lined frame → Hang Lead Door ↓ ↓ ↓ ↓ Check overlap Check anchors Check hinges Check gaps ↓ ↓ ↓ ↓ Install seals → Install astragal (pairs) → Final test → Survey / sign-off
A Lead Door is a shielded door leaf designed to block ionizing radiation at an opening.
Many projects also use a lead-lined frame. It closes the weak spots around the leaf, not just the center.
Common components you’ll see on a door schedule:
| Component | What it does | What we confirm before install |
|---|---|---|
| Lead Door leaf | Blocks primary radiation at the opening | Handing, swing, lead equivalency, rating requirements |
| Lead-lined frame | Prevents leakage around jambs and head | Lining position, anchors, wall thickness fit |
| Leaded glass vision lite | Allows visibility while shielding continues | Lead equivalency match, edge distances, secure lite kit |
| Astragal for pairs | Covers the meeting seam between leaves | Mount side, overlap amount, screw spacing |
| Seals and bottom | Controls light, smoke, air leakage | Friction vs closer power, full contact at stops |
Types you’ll see in real projects:
Pre-hung Lead Door set: frame and leaf prepared together. Faster field work, fewer surprises.
Slab-only Lead Door: new leaf, existing frame stays. Great for tight renovations.
Pair Lead Door: two leaves, needs meeting-stile coverage planning.
Rule of thumb: The leaf blocks the beam. The frame and overlaps block the gaps.
Good installs start on paper. We verify shielding first. We verify structure next.
Don’t guess lead thickness. Use the shielding report, physicist notes, or project documents.
Match lead equivalency across wall, frame, door, glass. One weak link leaks. It happens fast.
| Document or input | Why it matters | What we check |
|---|---|---|
| Shielding report | Defines required lead equivalency per barrier | Door, frame, glass, overlap notes, special conditions |
| Door schedule | Defines size, swing, rating, hardware set | Active leaf on pairs, finish, lite size, closer type |
| Opening details | Shows how wall shielding meets frame | Lead returns into openings, corner coverage, seam plan |
Weight risk: plan lifting gear and manpower. Slow wins here.
Code risk: rated assemblies follow strict rules. Follow submittals and approvals.
Shielding risk: missed overlap near the opening causes shine-through.
Choose the path. It changes the checks. It changes the tools.
Scenario A: pre-hung Lead Door and lead-lined frame. Common for new rooms.
Scenario B: slab-only Lead Door into an existing frame. Common for replacements.
Scenario C: pair doors. Plan an astragal and close order.
Vision lite tip: Keep the window far enough from door edges. It protects strength and stability.
Let’s keep it practical. Heavy leaf needs heavy planning. No shortcuts.
Use controlled lifting. Use rated gear. Keep hands away from pinch zones.
| Category | Examples | Why we need it |
|---|---|---|
| Moving and lifting | door cart, pallet jack, lift table, forklift, straps | Prevents tip-over and frame damage |
| Layout and alignment | laser level, 6' level, square, plumb bob, shims | Keeps frame true and the leaf centered |
| Fastening | impact driver, drill bits, anchors, screw packs | Holds frame and hardware under load |
| Protection | corner guards, blankets, floor protection, tape | Avoids dents, chips, finish damage |
Uncrate early. Inspect early. Freight damage hides under wrap.
Verify size and configuration at delivery.
Check for visible and concealed damage before install.
Store flat, dry, stable. Keep it off wet floors.
Keep hardware packs organized. They disappear fast on busy sites.
Set the frame first. Plumb, square, level. It drives everything.
Secure the frame for the leaf weight. Hinge rating matters here.
| Check | Pass looks like | Fix if it fails |
|---|---|---|
| Opening plumb and square | Consistent diagonals, straight studs, flat head | Correct framing, add backing, re-shim |
| Frame anchoring plan | Anchors match wall type and load | Upgrade anchors, add reinforcement points |
| Shielding continuity plan | Lead returns into frames and openings | Add lead strips, overlap seams, seal penetrations |
This is the core. Follow the order. It reduces rework. It keeps gaps consistent.
Confirm handing and swing. Mark the active leaf for pairs.
Confirm lead lining orientation in the frame and wall return plan.
Confirm lite location, hardware prep, closer plan.
Shielding fails at seams. It also fails at openings. So we plan overlap first.
Overlap sheet lead at joints and corners. Many specs use at least 1 inch.
Return lead into openings so the frame lands over a protected edge.
Cover fastener heads using approved methods, per project detail.
Fast tip: Start corners early. They take the most time. They also cause the most leaks.
Install the frame. Keep it straight. Check it twice. Tighten anchors in sequence.
Dry fit the frame in the rough opening.
Shim at hinge locations and anchor points.
Lock plumb at both jambs. Lock level at the head.
Confirm diagonals. If it racks, fix it now. Don’t “pull it later”.
Lead adds weight. Use a hinge system rated for the leaf. Use controlled lifting.
Stage the leaf on a lift table or door cart.
Set hinge pins or pivots using slow, stable moves.
Test swing early, before seals and closers.
Hardware cutouts can create leaks. So we keep preps tight. We avoid oversized holes.
Install lock, latch, strike, closer using templates.
Keep penetrations tight. Seal per approved detail if required.
Keep the door operating smoothly before adding high-friction seals.
Seals help light control. Some rooms need smoke control too. They add friction. Plan it.
Apply jamb and head seals for continuous contact.
Install door bottom. Confirm floor clearance across the sweep path.
Cycle the door ten times. Confirm it latches every time.
Pairs need a bridge at meeting stiles. The astragal provides it, plus better coverage.
Mount the astragal on the active leaf, on the correct side for the swing.
Keep overlap consistent from top to bottom.
Pre-drill and countersink. Keep fastener spacing consistent.
Pair door gap map (simple view) [Frame] | Leaf A | || | Leaf B | [Frame] ↑ Astragal covers this seam
Install the lite kit per submittal. Keep it tight. Keep it quiet. No rattle.
Confirm lead glass equivalency matches the opening requirement.
Confirm setting blocks and fasteners. They stabilize the pane.
Check for movement. If it shifts, fix it now.
Now we tune the system. Small tweaks here prevent long-term failure.
Adjust hinges or pivots for even gaps.
Adjust strike for smooth latch engagement.
Adjust closer speed for full latch. No slam. No stall.
Use a punch list. Keep it simple. Check every edge.
Frame stays plumb. No twist. No rack.
Leaf swings free. It latches consistently.
Seals contact continuously. No light leaks at stops or astragal line.
Opening returns remain intact. No exposed seams near corners.
Shielding work needs verification. Arrange testing and documentation per project process.
Keep photos, submittals, and maintenance notes. They save time later.
Not every site looks the same. Some crews install a full door set. Others swap only the slab.
We’ll cover each path. Pick the one matching your opening, wall build, and timeline.
| Scenario | Best use | Main watch-outs |
|---|---|---|
| Pre-hung Lead Door + lead-lined frame | New construction, faster field time | Rigging plan, anchor sequence, frame twist control |
| Lead Door slab into existing frame | Renovation, minimal wall disruption | Frame lining match, hinge reinforcement, leakage at stops |
| Pair Lead Door opening | Large clear opening needs | Meeting seam, astragal placement, coordinator timing |
| High-cycle rooms | Busy imaging suites | Closer sizing, hinge wear, latch alignment drift |
Stage the unit near the opening. Keep the route clear.
Dry fit the frame. Shim hinge zones first.
Anchor one jamb lightly. Re-check plumb. Then lock anchors.
Hang the leaf. Tune reveals. Install seals after smooth swing.
Small habit, big payoff: mark shim stacks by location. It speeds rework if the frame moves.
Slab-only work sounds easy. It still needs checks. We don’t skip them.
Verify the existing frame matches the shielding plan. If it doesn’t, fix the plan.
Confirm hinge reinforcement. Heavy leaf loads chew weak frames.
Measure hinge backset and preps. Match them before drilling.
Check strike height and latch alignment. Plan adjustments early.
Pairs add moving parts. They also add shielding risk at the meeting line.
Confirm active leaf. Confirm inactive leaf hardware plan.
Install astragal. Keep overlap consistent.
Install a coordinator if the spec calls for it. Tune close order.
Test latch on repeated cycles, then retest after seals go on.
Most issues come from three things. Racked frames. Weak overlaps. Rushed hardware.
We can dodge them. A short punch list helps every crew.
Top mistakes we see:
Frame set out of plumb, then “fixed” by forcing the door.
Wall shielding ends short of the opening return.
Anchors tightened before shims lock the frame shape.
Astragal mounted on the wrong leaf, wrong side.
Closer underpowered, so seals stop full latch.
Quick prevention moves:
Check plumb at each jamb. Use three points minimum.
Check diagonals before anchors go final.
Test latch and strike before seals and sweeps.
Use a simple “card test” to spot inconsistent gaps.
Take photos at each stage. They save arguments later.
Leakage hot zones around a Lead Door:
| Zone | Why it leaks | Fix |
|---|---|---|
| Jamb returns | Shielding stops short, overlap missing | Add return strips, verify lining orientation |
| Head corners | Seams stack up, corners get skipped | Use overlap strips, cover seams per approved detail |
| Meeting stiles on pairs | Two leaves create a seam line | Install astragal, verify coverage along full height |
| Threshold line | Clearance too large, bottom too short | Add approved bottom, tune closer power |
Something feels off after install? Start here. We’ll diagnose it fast.
| Symptom | Likely cause | Practical fix |
|---|---|---|
| Door drags on floor | Hinge sag, frame rack, floor high spot | Reset hinge shims, tighten fasteners, correct clearance |
| Latch misses strike | Strike misaligned, closer speed wrong, seal friction high | Align strike, tune closer, confirm seal compression |
| Uneven gaps at head | Head not level, jambs not plumb | Loosen anchors, re-shim, re-check diagonals, re-tighten |
| Light leak at meeting stile | Astragal mis-set, close order off | Reset overlap, tune coordinator if used, retest cycles |
| Door slams | Closer valves too open | Reduce sweep speed, increase latch control, set backcheck |
| Door stalls before latch | Closer underpowered, seals too tight, hinge bind | Increase closer power, correct alignment, reduce friction |
| Rattle at vision lite | Loose lite kit, missing blocks | Re-seat kit, add approved blocks, confirm torque |
Tip: fix alignment first. Seal tweaks come after. It saves time.
A Lead Door lives a hard life. Staff push it. Carts bump it. Closers fight seals.
Light maintenance keeps it quiet, safe, reliable.
| Frequency | What we check | What “good” looks like |
|---|---|---|
| Monthly | Latch action, strike tightness, closer speed | Full latch every cycle, no slam, no stall |
| Quarterly | Hinge screws, pivot wear, astragal fasteners | No sag, no wobble, seam coverage stays consistent |
| Every 6 months | Seal wear, bottom sweep, frame stability | No light leaks, stable frame, smooth swing |
| After any repair | Shielding continuity review, hardware prep review | No new gaps at openings, no oversized cutouts |
| Date | Room | Issue | Action | Result |
|---|---|---|---|---|
| YYYY-MM-DD | CT-02 | Latch rubs | Strike adjusted, closer tuned | Full latch restored |
Wear trend chart (quick visual) Month 1: |* Month 2: |** Month 3: |*** Month 4: |** Goal: issues drop after tune-ups
Use these lists on site. Print them. Share them. They keep crews aligned.
Shielding report in hand. Door schedule confirmed.
Opening measured. Plumb and square verified.
Lift plan ready. Route cleared. Floor protected.
Frame anchoring plan matches the wall type.
Hardware set on site. Templates ready.
Wall shielding returns completed at the opening.
Frame set plumb, square, level. Anchors tightened in sequence.
Leaf hung. Swing tested before seals.
Hardware installed. Latch works on repeated cycles.
Pairs: astragal installed. Close order verified.
Even gaps at head and jambs. No rubbing.
No light leaks at stops or meeting line.
Closer tuned for smooth close and full latch.
Vision lite stable, no rattle.
Photo documentation saved for records.
If you want examples of configurations and options, these ST-Shield pages help. We keep the list short.
A Lead Door install succeeds when three things align. Structure stays true. Overlaps stay continuous. Hardware stays tuned.
If we follow the checklists, we avoid most call-backs. It feels boring. It saves money.
Need help specifying or sourcing a Lead Door solution? Visit ST-Shield to start.
