Urban Shelter Improvisation

Choose a room with fewest windows and doors—interior bathrooms or closets work best. Avoid rooms with HVAC vents. Ensure water access if possible. Have tape, plastic sheeting, and blankets immediately available. Identify this location now, before crisis strikes.

Close all doors flush. Apply duct tape or cloth tape along entire door frame edges—top, bottom, sides. Tape every visible crack and gap, including baseboards and electrical outlets. Cover all windows with plastic sheeting, taping plastic to frame, then taping plastic edges to walls with overlaps at corners. Seal HVAC returns and supply vents with taped plastic. Use petroleum jelly in crevices where tape won't stick.

For temporary breathing protection before sealing: wet cloth over mouth filters large particles. If time permits: take plastic container, drill small holes in bottom, layer inside with cloth, activated charcoal (from burned wood), sand, gravel, cloth on top. Secure over window with tape. Mark room 'do-not-enter' to prevent others from breaking seal.

Improvised filters stop only large particles. For severe chemical or biological threats, sealed shelter-in-place (no air exchange) is safer than filtering contaminated air.

Tape blankets, tarps, or cardboard over all windows—seal every light gap. Block interior lights or switch off power to room. Blackout prevents outside visibility, reduces heat loss, and aids temperature regulation. Reduces psychological stress from seeing danger outside.

Insulate with blankets taped to walls and windows. Move to smallest space possible (closet or corner) to concentrate body heat. Seal gaps between blanket insulation using additional blankets or plastic. Keep clothing dry and layered—moisture causes heat loss. Huddle close with others to share warmth. Stay away from alcohol and stimulants which increase heat loss. Cover floor with blankets.

Fill bathtub and containers from tap before sealing—assume water system contamination after threat begins. Store minimum 1 gallon per person per day in sealed, labeled containers. Pre-position supplies in your shelter: blankets, duct tape, plastic sheeting, first aid kit, medications, canned food with opener, matches, candles, battery radio, hand sanitizer. Create inventory list. Keep supplies dry and organized for quick access without breaking seal.