On 22 Apr 2006 04:26:32 -0700, "Weatherlawyer"
Post by WeatherlawyerPost by T i mI took the chimney breast out from the kitchen > back bedroom of this
1897 end-of-terrace place and finally took the (small) stack down and
the remaining breast when the roof was refurbed (slates stripped,
lined, replaced).
I started by supporting the front face with an acro but soon found
that in spite of the mortar being mainly sand it was fairly well keyed
into the wall and wasn't 'falling' anywhere.
I should doubt very much that any chimney lacks at least a key at every
3rd course or so.
This was keyed every other course from memory ..
Post by WeatherlawyerSome stacks can weigh a ton in a few feet as a brick is about 2 or 3
lbs of dried clay. They have no sheer resistance.
Possibly, but wouldn't the fact that the mortar was fairly soft allow
all the keys to take their share of the load, so the mass that was
free to fall would only be the centre course at the front (and
gradually coballing themselves back to the sides (and how infact I
took it down as it was supported by an acro at the ground fooor
fireplace).
Post by WeatherlawyerWhat you do with a
column of bricks 20 or 30 feet high is your business.
I gently knocked at least 50% out with a 2lb hammer, knocked off the
mortar and stacked them neatly for reuse?
Post by WeatherlawyerBut if you undermined it and invited me around, it would be for a
fight.
Well you wouldn't have been offered a cuppa if you were to frigntened
to help.
Post by WeatherlawyerWhat you were relying on was the integrity of the roof to resist
the gable holding the chimney up.
Eh? The chimney was standing 50% on the existing flank wall and the
side cheeks where there were keyd into the flank wall down to the
first floor (and from there to the ground floor to start with).
Post by WeatherlawyerA small amount of movement would have
taken place after every storm. And not gone back.
Possibly .. this place has been squirming about for the last 100+
years ..?
Post by WeatherlawyerI don't understand how you could be such a damned fool and not realise
from the OP in this thread on, that there must have been some sort of
frictional type device holding up the chimneys discussed here.
Ermm, not sure (again) what you are getting at here .. probably leagal
jargon .. ;-)
Post by WeatherlawyerWhat did you think was holding them up? Bird shit and wall paper paste.?
I didn't 'think' what was holding them I knew, good brick bonds and
sandy lime mortar (and an acro while I was *actually* taking it down,
just in case ...)?
And that was 30 years ago now ..
What was potentially dangerous though was the builder that set the
joists against (rather than on with possibly a small birds mouth) the
wall plate on the new 'end wall' when he built the extension to the
rear addition. Fine if it was a pitched roof. Luckily he (finally)
agreed and did it properly ..
All the best ..
T i m