Expansion joints

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spunky

spunky

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I've got internal Walls on a staircase with approx 35m in each and one with 60 odd there aren't any expansion joints cut into the concrete will putting expansion joints in actually help against any movement?
 
If there isnt any joints in the concrete where would you put them? You cant really pick where its gonna crack unless there are joints on the internal angles.
 
That's what I was thinking mate but apparently the young Ginger site manager told me we should be using them
 
we use to put 2 stop beads back to back spunk in the internal corners as an expantion joint than decotators would fill with chaulkin ( make any sense spunky ) :rolleyes)
 
been reading this with interest...
is there actually a spec from bg or anyone involved in the manufacture of finish plaster that states the maximum area before an expansion joint is needed?
I see 6m been mentioned?
 
point on board already, but 'they' put expansion joints in 'substrates' (for want of a better word) for a reason...
so it does stand to reason that anything even slightly prone to expansion (and i can only think of 1 material that isnt and thats kevlar) should have an expansion joint relative to its 'expansion coefficient' (i got that term working on the windows, but its really relevant)...
so, if concrete, brick walls, uPVC etc needs expansion joints... why doesnt finish plaster? logic states it does, but where is the cut off point?
 
I queried about expansion joints on a job in France 50m linear metre walls and not an expansion joint in sight.
I was told as it was pre stressed concrete it didin't need them
The french are very , very good at concrete strutures so who was I to argue !
 
see this is my point... walk down a hospital corridor.... do you see expansion joints?

build a brick wall, and you need expansion joints, so is the 'expansion coefficient' of bricks and mortar different to finish plaster? if so, why? it dries out at the same rate..... well it does according to everything ive ever read/beentaught etc.. i.e 1mm per day...
 
i know i harp on about the states and sometimes i embarrass myself but they had expansion joints in p/board every i think25 ft cant remember to be honest,i always quireed it cos there was none in the framing the board was stuck too never made sence
 
Chris W said:
see this is my point... walk down a hospital corridor.... do you see expansion joints?

build a brick wall, and you need expansion joints, so is the 'expansion coefficient' of bricks and mortar different to finish plaster? if so, why? it dries out at the same rate..... well it does according to everything ive ever read/beentaught etc.. i.e 1mm per day...
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Hmmmmmmmmmmm expansion joints in hospitals, well here is just a little bit of trivia, years ago and i mean years ago when they used to build hospitals they would render the bottom half of the walls with a stronger mix because of trolleys banging the wall, then render the top half with a softer mix, then there would be a dado rail one that was usually sunk into the wall and this was your expansion joint so not only was it serving a purpose it was also decorative. :)
 
flynnyman said:
Hmmmmmmmmmmm expansion joints in hospitals, well here is just a little bit of trivia, years ago and i mean years ago when they used to build hospitals they would render the bottom half of the walls with a stronger mix because of trolleys banging the wall, then render the top half with a softer mix, then there would be a dado rail one that was usually sunk into the wall and this was your expansion joint so not only was it serving a purpose it was also decorative. :)
Click to expand...

they did do this but it was nt s+c it was some type of high impact plaster cant remember the name now
 
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