Mike Halmarack <
mikehalmarack@gmail.com> wrote:
An inspection found that I need to close an uneven gap at the head of
my fire door.During the cutting the head level, and then rebuilding,
to fill the gap, I need to plough a groove in the new section to fit
an intumescent strip.
I located these at Screwfix: https://www.screwfix.com/p/firestop-fire-door-intumescent-strips-white-15mm-x-4mm-x-1050mm-5-pack/21295
Reading the included info, I see:
"As a guide, only use 15mm seals on new door application and 10mm
seals for replacement / retrofitting."
As the existing strips around the rest of the door are 15mm, is there
a subtle reason, that I'm missing, which would make it necessary for
me to use the 10mm strip, rather than continuing with the existing
15mm stuff?
I know this seems like a trivial question, but my old creaking joints
cause me to be increasingly careful not to make mistakes.
The only fire door and frame I ever installed was many years ago and the intumescent strips at the time appeared to be about 10mm so maybe that the standard has changed allowing 10mm for retro fits whilst new installations
need to comply with new standards. I would go with 15mm if that is what you have got now.
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