How to Install and Replace a Storm Door
Updated: Nov. 23, 2022
Make a perfect installation even in less-than-perfect situations.
New storm doors are easier to install, with plenty of standard sizes to fit almost any entryway—but there are still tricky spots. Follow a pro through the installation process and learn the tricks and techniques that the instruction manual doesn't cover.
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How to Replace Screen Door Overview
You no longer have to put up with a rusty old storm door that bangs shut every time the kids go out. The best storm doors are stronger, smoother and a heck of a lot more handsome than the doors we grew up with. In fact, installing a new one is one of the least expensive ways to dress up an entry.
Replacing an old one is easier than you might think. Manufacturers have made installation more DIY-friendly by providing standard sizes that’ll fit almost any door opening and simpler installation kits. Still, you’ll find some sticking points. The following step-by-step directions walk you through some tricks and techniques of how to install a screen door or storm door you won’t find in any instruction manual.
If you have a hacksaw, screw gun, a short level and a pair of side cutters and two to three hours, you’re on your way to saving the cost of a professional storm door installation. Replacing an old storm door or installing a new one is a perfect Saturday morning project, even if you have limited carpentry skills.
Step 1: Selecting the door
Measuring for a storm door begins when you learn how to find the size of the storm door you need, simply measure the height and width of the main door. Most front entry doors are 36 in. wide and require a 36-in. storm door.
For this article, we chose a “full-view” storm door. The one we show has removable screen and glass panels that you change each season. The other common type, a “ventilating” storm door, has glass panels that slide open or closed over the screen, much like a double-hung window.
Nearly every storm door sold is reversible. That is, you can install it with the hinge on either side. The manufacturer’s directions tell you how to do it. When you buy it, you don’t have to specify which way the door must swing.
You typically mount storm doors to the exterior door trim using “Z-bars.” The hinge-side Z-bar may already be screwed to the door (ours was), or you may have to mount it once you determine the door swing direction. On some doors, you’ll also have to drill holes for the latch.
Step 2: Getting started
Photo 1: Inspect the door before starting
Pick a flat area near the entry door, lay the box flat on the ground, fold it open and check to make sure you have all the parts.
Begin the project by folding open the box and removing the glass storm panel. Set it and the screen panel in a safe place out of the wind. Then check for damaged or missing parts by comparing the contents with the parts list in the instruction manual. (Ours had been returned, repackaged and sold as new. One of the parts had already been cut to length and the mounting screws were missing.) Use the cardboard as a work surface to prevent scratching the parts while you work on the door. Your door may come with a protective plastic film. Only peel off those areas needed for installing hardware during installation. That way the door will be protected from scratches. After installation is complete, peel away the plastic.
Determine the door swing. In general, hinge the storm door on the same side as the main door. However, consider these exceptions:
- Adjoining walls. If there’s an adjoining wall or rail, it’s best to have the door swing against it; otherwise entry can be awkward, especially if you’re carrying groceries.
- Electrical. Will the door open against any outdoor light fixtures? Will the doorbell or light switch wind up on the latch side where they belong?
- Wind. If there’s a strong prevailing wind, it’s best to have the door hinge side face the wind direction. That way, sudden gusts can’t fling it open and break it.
Why a storm door?
A traditional storm door was a real workhorse. It protected the handsome but vulnerable wooden main door from harsh weather and helped to insulate it.
Today’s better insulated and protected main doors have little need for a storm door and are often eliminated from new homes, showing off fancy front doors. However, the “full-view” storm door (like the one we’re installing here) still showcases the main door and, when screened, allows you to take advantage of those cooling summer breezes too.
Step 3: Out with the old storm door
Taking off an old aluminum door is usually just a case of unscrewing the mounting screws on the door, closer and safety chain. But sometimes there’s caulk around the frame. You can usually cut through the caulk with a utility knife. But worse yet, you could find old caulk between the frame and the door casing. If so, you’ll have to pry the frame away with an old chisel and scrape the trim surfaces clean. A heat gun may help soften the caulk. Get rid of an old door by throwing the glass panel in the trash, and then cut up the aluminum frame and door with a circular saw and a carbide-tipped blade. Toss the pieces into the recycling bin.
Wooden storm doors generally have hinges that are mortised (notched into the wood) and screwed to the door casing. Don’t worry about the hinge or latch recesses. When you install your new storm door, they’ll be hidden behind the new door frame.
Step 4: Prep the opening
Photo 2: You may need a trim extension
Add a trim extension if needed to doors with sidelights. Prime and paint the new trim, position it with a reveal equal to the other trim and then nail it into place.
Photo 3: Fasten the hinge-side Z-bar
Confirm the door swing direction and fasten the hinge-side Z-bar to the correct side (if necessary). Mark a cutting line on the Z-bar 3/16 in. above the top of the door with a square. Slide the weatherstripping aside and cut the Z-bar with a hacksaw. Use an 18- to 22-tooth-per-in. hacksaw blade
Photo 4: Cut the Z-bar to length
Measure from the outside lip of the threshold to the top door casing. Transfer the measurement to the bottom of the hinge-side Z-bar and cut it to length, matching the angle on the threshold.
Photo 5: Cut the weatherstripping
Center the weatherstripping in the Z-bar, then snip off the ends, leaving it 1/2 in. extra long at each end.
Photo 6: Add a furring strip
Measure the opening width and determine the furring strip thickness (see text). Cut a furring strip to length, then nail it to the inside edge of the hinge-side casing with four evenly spaced 4d galvanized box nails.
Storm doors hang from the door trim, technically called “exterior casing.” If the door has never had a storm door (as in our situation), you may have to extend the trim between the door and a sidelight (Photo 2). This is the most difficult situation you’re likely to encounter. You have to rip a new trim piece to match the thickness of the other trim (usually 1-1/8 in. thick).
If your entry door trim needs paint, do it now. It’s a pain in the neck painting around a new door, and you’ll have a crisper-looking job.
Manufacturers make storm doors a bit narrower than standard openings to make sure they’ll fit. If your opening is typical, you’ll have to “fur out” the sides to center the storm door in the opening. You’ll nearly always need to install at least one 1/4-in. furring strip (screen molding usually works fine) on the hinge side (Photo 6) and possibly even have to add another one to the latch side (Photo 11). To figure this out, measure the exact width of the opening, that is, the distance between the inside edges of the trim. (Measure at the middle, top and bottom.) The manufacturer’s instructions will usually list the minimum width required. Subtract that width from your measurement and make the furring strip thickness along the hinge side about half the difference.
Step 5: Install the door
Photo 7: Set the door in place
Lift the door into the opening and pry it against the hinge-side casing with a twist from a rubber-handled pliers on the latch side. Screw the hinge Z-bar into the door casing side.
Photo 8: Install the top Z-bar
Swing the door open, slip the top-side Z-bar into place and close the door to hold it. Adjust the gap between the Z-bar and the top of the door until it’s even and screw it into the top casing.
Photo 9: Mount the latch
Mount the latch mechanism, then mark the position of the top and bottom of the latch on the door casing. If the space between the door and the casing is over 5/8 in., nail two 1/4-in. thick furring strips to the inside of the casing, one above and one below the marks (see Photo 11).
Photo 10: Cut the latch-side Z-bar
Hold the latch-side Z-bar against the open door and center the holes on the latches. Then push the door and Z-bar against the door frame and mark and cut the bottom at the angle of the threshold. Then mark the top (close-up photo, next) and cut it.
Mark and cut the top of the latch-side Z-bar.
Photo 11: Chisel the dead bolt mortise
Close the door against the casing with the dead bolt extended and chisel out the wood where the deadbolt hits. Slip the latchside Z-bar into place, close the door against it and screw it to the casing, keeping a consistent 1/8-in. gap with the door.
Photo 12: Adjust the door sweep
Slide the rubber weatherstripping into the door sweep and crimp the ends. Slide the sweep over the door bottom and tap it down to snug it to the threshold. Drill 1/8-in. holes through the adjustment slots and add the screws.
Photo 13: Attach closers
Position the closer bracket and screw it to the jamb. Attach the closer, level it and mark the screw positions on the door. Drill 1/8-in. pilot holes and screw the closer to the door. Repeat for the top closer.
It’s important to mount the door tightly to the hinge-side trim. Pry against the latch side to make sure it snugs up tight. (Photo 7).
Follow the photos with your instructions for the rest of the installation steps. Door latch and Z-bar systems vary. Cutting the latch-side Z-bar is a bit fussy. The idea is to center it on the latch and lock (Photo 10). Observe where it strikes the sill and cut the bottom at an angle that matches the sill. Then cut the top so it fits against the top Z-bar. Don’t worry if the latch and lock bolt end up a bit off-center, as long as they work smoothly.
You may need to chisel out the latch or deadbolt pocket as we show (Photo 11). It all depends on the door latch style.
After installing the door sweep and closers, adjust the closer tension. Begin with the window panel rather than the screen in place. The closers should be set with the door at its heaviest. You may want to reset a gentler setting for the screen panel.
Finally, it’s a good idea to save the boxes for the window and screen panel for off-season storage. Under a bed is a great safe storage location.
Dealing With Warped Doors
Storm doors often appear to be warped because they don’t rest evenly against the weatherstripping at all corners. However, it’s usually the entry door trim that’s a bit out of whack. Small gaps may disappear when you install the door closers, especially if your door comes with one for the top and one for the bottom. If that doesn’t do the trick, try prying out the Z-bar slightly and slip in a shim to close the gap.
Bigger gaps call for more drastic measures. First, loosen all the Z-bar screws and remove the screws at opposite corners of the door. Then slip a shim behind the corner screws, opposite the gap. Tighten the corner screws to see if the gap closes. Try varying sizes of shims until the door closes well. Then slip in progressively smaller shims behind the rest of the screws as you tighten them to taper the gap between the Z-bar and the door casing. Cut off the shims, then caulk the gap and paint it to match.
Required Tools for this Project
Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.
Required Materials for this Project
Avoid last-minute shopping trips by having all your materials ready ahead of time. Here’s a list.
Originally Published: January 18, 2019