02/10/2026
There is no rain inside your home, so the only water that ever reaches the bottom of an internal steel frame comes off your mop and your floor cleaner.
That bottom rail sits in a wet line every time the floor is washed, and tile cleaner is harsher on a coating than rainwater has ever been.
Add the splash from a shower room or a utility and that edge is damp more often than any window on the house.
It is also the one part of the door nobody inspects, because the eye goes straight to the glass and the handle.
What decides whether any of that matters is not the steel, it is what happened to the frame before the colour went on.
Wet paint sprayed onto bare steel chips from a single knock with a hoover, and once moisture gets under the film it lifts the coating from below.
Done properly the frame is shot blasted first, then zinc primed or fully galvanised where the room is a wet one, then powder coated and baked in an oven so the colour hardens onto the steel.
That is why a galvanised frame holds its own in an en-suite, a utility or beside a pool, and why a deep scratch down to bare metal is a repair rather than a failure.
So before you sign anything, ask three things: is the frame shot blasted before priming, is the primer zinc or full galvanising, and is the colour powder coated and oven baked rather than sprayed on.
Our steel is hand-welded and finished that way as standard, supplied and fitted by one team with a 10 year written guarantee on the installation.
Book a free consultation and we will go through the frame, the finish and the glass for your opening 🏡
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hand-welded steel • Crittall-style doors • steel frame doors • powder coated steel • galvanised steel • internal glass doors • bespoke steel doors • steel doors London • frame finishing • supply and fit