The screws, not the screen, are what end a pool cage

2 October 2026

There is a rust streak running down the frame of your pool cage. It starts under a screw head and fans out orange across the aluminum below it. You have been walking past it and filing it under cosmetic.

It is not. Screen is the part everybody watches. But an aluminum enclosure almost never comes apart because the mesh gave out. It comes apart because the fasteners stopped holding. A cage company owner in Florida put it plainly: rusty screws are one of the main reasons cages start failing over time, and small tears turn into big replacements fast.

So walk your own cage. Ground level, phone zoomed in for anything above your head, no ladder against the frame. Start at the deck and work up.

Why a screw rusts while the aluminum around it does not

The frame is aluminum, and aluminum does not rust. It oxidizes into a dull grey film that protects what sits under it, which is why a chalky upright is not the emergency it looks like. The fasteners are a different metal.

They are stainless or coated steel, and on a coated screw the coating is the whole defense. A bit that slipped during the build leaves bare steel showing, and salt air finds it. Two metals touching with salty water between them also drives a reaction that eats one of them faster. Inside the hole the screw swells as it corrodes, and swelling steel in a snug aluminum hole works like a slow wedge. The stain outside is the report from inside the hole.

Base plates, where the upright is bolted to the pool deck

Start low, because water does. The bottom inches of every upright sit in the wettest place on the property. Rain stands in the low spots and sprinklers hit the same corner every morning.

Kneel at a corner upright and look at the plate, the fasteners through it, and the bottom inch of upright above. Rust bleeding from under a plate onto the concrete is the loudest signal on the cage. So is a plate corner you can get a fingernail under, or white powder bubbling at the base. Then turn one plate screw with your fingers. A head that spins and never draws tight has nothing left to bite, and corners carry more load than the middle of a wall.

The corner where an upright carries the top beam

Follow that upright to the top of the wall, where it meets the horizontal beam. That joint is usually a bracket with screws running in two directions, and it does the hardest structural work on the cage. Zoom in and photograph it instead of craning your neck.

You are hunting a difference between corners. All four were built the same way on the same day, so the one that does not match is the one to ask about. Daylight where the others sit tight. A screw head standing proud of the bracket. A rust trail that starts at the bracket and runs clean above it.

The door, the only part of the cage that moves

Everything else stands still. The door swings every time somebody goes out to the pool, and every swing loads the hinge fasteners in a direction the rest of the frame never feels. That is why door hardware tends to go visibly bad first.

Open and close it slowly. A door that drags on the deck, or needs a lift at the handle before it latches, has already moved. Look at the hinges, bottom one first, because it carries the weight. Rust rings around the screws, heads rounded off where a driver skipped, a gap wider at the top than the bottom. If hinge screws pulled because the aluminum gave way, a new hinge in those same holes has nothing better to hold.

Small rust dots in a row along a beam

Now read the long beams, at the flat face where the mesh is splined in and the frame members screw together. The tell is spacing. Fasteners sit at even intervals, so a run of small orange dots at a regular rhythm is not dirt. It is a line of the same screw, in the same conditions, going at the same rate.

Look at the mesh where it passes a screw head. A corroding head gets rough and sharp, and wind works the panel against it all day. Plenty of tears blamed on old screen started at a fastener that turned into a file. If your panels are failing in a pattern that has nothing to do with sun, read screens failing on one side of a cage before you buy new mesh.

The roof beams, read from the ground with the phone zoomed in

The roof has the hardest job and the worst access. In wind its fasteners work in the one direction fasteners are weakest, straight back out of the hole. Uplift does not push a screw. It pulls it.

Stand well back and zoom in on the underside of the beams. Do not climb, do not lean a ladder on the frame, and do not put weight on a roof panel. The fasteners you are worried about are the ones that would be holding you. Look for rust bleed under a beam, a dark hole where a screw head should be, and mesh sagging from one beam while its neighbors stay tight.

Paint, sealant, and a longer screw in the same hole

Paint over the streak. The stain is the only thing telling you what is happening inside the hole. Cover it and the corrosion carries on with the alarm switched off.

Silicone over the head. This one feels right and does the opposite. Sealant traps the water already in the hole and stops the spot from ever drying out.

A bigger screw in the same hole. If the aluminum in there is chewed up, forcing a fatter fastener in splits the member and takes away the last material a real repair had to work with.

What replacing fasteners on a cage actually involves

Not the whole cage at once, and anyone who quotes it that way without walking it first should be asked why. Scope comes from location: the wet side base plates, the door, the beam over the pool. Each one comes out, the hole gets read, and where the aluminum is sound a stainless replacement goes back in. Where the hole is gone, that member needs a bracket or a new section, and now it is a question about the condition of your cage frame.

If the mesh is near the end anyway, do both in one visit. New screen over hardware that is letting go buys you the screen and none of the fix. If the screen is sound and a panel or two opened up at a screw, that is a single panel screen repair and nothing more.

The part that costs nothing: rinse the frame with fresh water, base plates and door especially, and more often on a canal in Cape Coral. Then find your sprinkler heads. One that sprays the same upright every morning delivers salt to a fastener on a timer, and turning it a few degrees is the cheapest cage repair there is.

Rust dots, spinning screws, and whether it can wait

Can a screw be replaced without pulling the screen out?

At a base plate, a bracket or the door, yes. Those sit in the open and the panel never gets touched. Where a screw sits under the spline, the mesh in that panel comes out and goes back in, which is why fastener work and screen work get quoted together on the same wall.

The head turns and never gets tight. How bad is that?

That is the one to act on. A fastener that spins holds nothing. The threads it was biting, in the aluminum or in the anchor under the plate, are gone, and the load it carried now sits on the fasteners beside it.

One upright is streaked and the rest of the cage is clean. Why?

Something local keeps that spot wet. A sprinkler head aimed at it, a downspout dumping beside it, a low place in the deck that holds a puddle. Find the water first, or the same stain comes back around the new fastener.

We work Fort Myers, Cape Coral, North Fort Myers, Lehigh Acres, Estero, Bonita Springs and Punta Gorda. Walk the cage, take the photos, then set up a free estimate. We will go through what you found, frame and screen, and put the scope in writing.

Call (239) 357-7182