Storm Windows: How to Remove, Clean and Reinstall Them Without Doing Damage

The short answer, in order

Storm windows get broken by handling, not by washing. Work one opening at a time and the job is uneventful. Label every panel on its interior top rail with painter's tape before it moves. Storm panels are cut to their own opening and vary a sixteenth of an inch or more between openings that look identical, so a shuffled stack means panels that bind or leave gaps you will never close. On triple-track aluminum, squeeze both spring latches, tilt the bottom of the panel inward, then lift the top out of the channel. On wood storms, lift off the hangers or back out the blind-stop screws with a second set of hands; a 32-by-54 wood storm runs 20 to 30 pounds. Wash flat, dry the bottom rail first, reinstall top-in-first. Caulk the head and both jambs, never the sill. A competent hand spends about eight minutes per opening on the off-and-on, plus wash time.

Three storm types, three failure points

Triple-track aluminum, the common mid-century combination unit, uses a plastic spring latch at each upper corner of every panel. Those latches are the single most common casualty. After 40 or 50 years the plastic is brittle, and squeezing a cold one at 35 degrees snaps it. Do this work above 50 degrees. Replacement latches run $4 to $10 a pair if the profile is still made; if it is a discontinued proprietary shape, you are down to a stainless screw and fender washer as a stop, which works and looks like what it is. Wood storms hang on hooks or screw to the blind stop. Score the paint line with a utility knife first, and pry against a shim block on the sash rail, never against the trim and never against the glazing bead. Interior acrylic panels pull out of a magnetic or compression channel by hand: grab the frame, not the acrylic.

Pre-1978 painted wood: the part where we turn down work

If the house predates 1978 and the storm sash is painted, assume lead until a test says otherwise; pre-1960 paint tests positive most of the time. Removing a painted-shut wood storm means scoring, prying and scraping, which is exactly what the EPA's Renovation, Repair and Painting rule covers: paid work disturbing more than 20 square feet of exterior painted surface on pre-1978 housing has to be done by an EPA Lead-Safe Certified firm using contained work practices. Idaho is not an authorized state, so the federal rule applies directly. Practically, never dry-scrape, never sand, never pressure wash old painted sash, and do not let chips land in a flower bed. Boise's North End and East End and the older blocks of Nampa and Caldwell are full of original wood storms on pre-1940 houses. Reflekt is not a lead-certified renovation firm. If yours are painted shut, we clean the glass we can reach and send you to a certified sash shop for the rest.

Washing the panels without wrecking them

Pure deionized water rinses clean and dries spot-free with nothing to wipe, which is why it suits storm panels you would otherwise have to towel-dry on a driveway. It has a limit worth stating: DI water lifts dirt and mineral film, but it does not cut 40 years of baked grease out of an aluminum track. Tracks get vacuumed, brushed with nylon, then wiped by hand, and lubricated with dry silicone or paraffin. Never oil or WD-40, which pulls in grit and gums the track inside a season. Acrylic and polycarbonate panels, meaning most interior storms and many replacement panels: no ammonia, ever. Windex-type cleaner crazes acrylic into a permanent web of fine cracks. Mild soap, a soaked microfiber, no dry wiping. And do not pressure wash a storm window. A residential machine at 2,000 to 3,000 PSI drives water past the glazing, blows out old putty and pushes it into the wall cavity.

Weep holes and the bottom-edge caulk rule

Look at the bottom rail of any exterior storm window. There should be two or three small slots in the outer face. Those are weep holes, and they are the only reason the storm is not a bathtub sitting on your sill. Condensation and wind-driven rain get into the cavity between the storm and the primary window, and the weeps let it back out. Plugged weeps are the leading cause of rotted wood sills on houses that have storms. So caulk the head and both jambs, and leave the sill line open. Never run a bead across the bottom and never caulk over a weep hole. If someone already did, cut it out with a utility knife and clear the slots with a bamboo skewer. Related: fog between the storm and the primary window is not a storm problem. House air is leaking out past the interior sash. Weatherstrip the primary and open the weeps.

Putting them back, and three things nobody can fix

Reinstall top-first: set the top of the panel into the upper channel, swing the bottom in, let the latches click. If it will not seat, it is upside down or in the wrong opening. Read your tape label; do not force it. On aluminum frames screwed to the blind stop, snug is the target, hand tight plus about an eighth of a turn. Overdriving dimples the flange, bows the frame and binds every panel in it. Most caulks want 40 degrees or warmer, which in the Valley means September or October, not the week before Thanksgiving. Three failures we will name before starting rather than after: crazed acrylic is permanent, chalky pitted aluminum has lost its anodizing and only paint brings it back, and hard-water etching from years of sprinkler overspray is corrosion into the glass, not deposit on it. That last one is a glass shop with cerium oxide, roughly $75 to $150 a pane, or replacement.