Blackout Procedures: Purpose and Implementation

Blackout Implementation: Quick Steps

Identify which scenarios warrant blackout (see criteria below)
Gather materials: Black plastic sheeting, thick blankets, or blackout curtains
Cover all windows: Tape, tacks, or tension rod the covering. No gaps at edges.
Check from outside: Walk around the building at night and look for any light escaping
Establish light discipline: Everyone in the household knows: no lights without covers in place, minimal light use near doors
Movement outside: Use red-light mode or no light at night if blackout is active

When Blackout Is and Isn't Relevant

Blackout is a specific tool for specific scenarios. It's not a default emergency procedure.

Blackout is appropriate when:

Civil unrest in your immediate area at night. A lit home at night signals occupied, with resources, to anyone looking. During active looting or widespread social breakdown, dark houses are lower-priority targets.
Scenarios where you need to avoid signaling your location to unknown parties. This is relatively rare in civilian emergency situations but applies in extended grid-down scenarios with security concerns.
Personal OPSEC during periods where you don't want to advertise your presence or activity level.

Blackout is not appropriate when:

You want to be found. Search and rescue, in every natural disaster scenario, responds to signals — including light. During hurricanes, floods, or wildfires, light signals your location to helpers.
Normal power outages. Lit candles or flashlights signal you need help and are normal. No threat concealment is required.
Medical emergencies. Getting help matters more than concealment.

Know which scenario you're in. Blackout applied in the wrong context can actually harm you.

Materials

Fast and cheap: Black plastic sheeting Construction plastic (4-mil or 6-mil poly sheeting, black) costs $30-50 for a roll that covers multiple windows. Cut to size and secure with heavy-duty tape, tacks, or staples around the perimeter. Any gap leaks light. Work from outside in the dark after installation to identify gaps.

Reusable and better: Blackout curtain fabric Sold in fabric stores and online for bedroom light blocking. It's opaque, cuts cleanly, and can be made into panels that hang like curtains. Mount on tension rods or curtain tracks for removable/remountable blackout capability. Cost: $2-5 per linear foot.

Improvised: Blankets, sleeping bags, tarps Heavy blankets or sleeping bags over windows block light well but are hard to seal at the edges. Supplement with tape or push the furniture against the blanket edge and wall. Works, but less airtight than dedicated sheeting.

Installation Method

The critical word is edges. A blackout cover that blocks 95% of a window leaks enough light to be visible from 50 yards. The corners and edges are where blackout materials fail.

For temporary installation:

Cut your material 4 inches larger than the window opening on all sides
Apply material starting from the top, taping or tacking the top edge first
Pull the material flat and tape both sides before doing the bottom
Tape all edges at 6-inch intervals minimum
Go outside and inspect in darkness. Check corners specifically.

For more permanent installation (repeated use):

Install hook-and-loop (Velcro) tape around the window frame perimeter
Sew matching tape to the perimeter of blackout fabric panels
Panels attach and detach in seconds with a seal at all edges

Internal Light Discipline

Even with windows blacked out, loose light discipline defeats the effort:

Door discipline: Every door opening bleeds interior light to the outside, even for a moment. Establish a transition protocol: turn off interior lights before opening exterior doors, then open and close the door, then turn lights back on. This requires communication and agreement among everyone in the household.

Candle and flame discipline: A lit candle moved near an unsealed window or placed on a windowsill illuminates the blackout material from inside, making the material's silhouette visible from outside. Keep flames away from windows.

Red light for interior navigation: Standard red-filtered headlamps for movement inside. Red preserves night adaptation if you need to go outside. If blackout breaks down at a specific moment, red light shows less distance than white light.

Practice Run

Do a blackout drill once before you need it in a real situation. Cover all windows in your designated shelter area, wait until full dark, and walk around the outside. You'll find gaps you didn't know existed — at window frame edges, around door hinges, through mail slots, at the sill line. Fix them during the drill. You won't have the luxury of finding them during an actual blackout event.

Sources

WWII Civil Defense Blackout Procedures - U.S. Office of Civilian Defense
U.S. Army FM 3-21.8: The Infantry Rifle Platoon and Squad (Light Discipline)
FEMA - Civil Disturbance Preparedness

Frequently Asked Questions

When does blackout actually matter for civilian preparedness?

Blackout is relevant in two civilian scenarios: civil unrest where a lit home signals occupied presence to looters or threats at night, and scenarios requiring concealment of your supply level and location (extended grid-down situations where light is scarce). In normal emergencies (power outage, natural disaster), light actually helps — signals your location, aids in rescue. Know which scenario you're in before implementing blackout.

What materials work for improvised blackout curtains?

Thick black plastic sheeting is fastest and cheapest — available at any hardware store as construction plastic or trash bags. Double-layer over any window with tape or tacks. Purpose-made blackout fabric (typically sold for bedrooms) is reusable and aesthetically better. The threshold is simple: no visible light from outside at night. Test by going outside in the dark and looking at your windows.

Can you use regular LED headlamps and flashlights during blackout conditions?

Inside, yes, as long as the windows are covered. The issue is light escaping through windows and gaps, not using light inside. Red-light mode on a headlamp is ideal for moving inside a blacked-out space — red light preserves night vision better than white light if you need to go outside, and it shows less at distance.