Issue with plaster on stairs

[theplayer]

Looking for a bit of advice here.... (as usual)!

Where my walls meet the stairs (stair string ?) I have a nice crack running along it as there is a bit of movement in the stairs. How can I best solve this ?

One of my mates ripped about an inch of the wall out and filled it full of plaster and then caulked along the edge which has solved most of it apart from the bottom part (where most of the movement is). What can I do to address this as more plaster/polyfilla will just crack again.

I can't really run a quadrant bead along as it appears that the width of the stair string seems to change. I have been told to drill it and screw it and then caulk, but in order to get the rawlplugs through the width of the hole is bigger than the screw head so there is now way it would be of any use.

Any advice much appreciated!


Ben.

 

[PrenticeBoyofDerry]

Ideally you need to sort out the source of the problem, "the stairs"
You need to stop them from moving and causing the crack.
I would as a wall repair, rake out the crack, so you can fit a reinforced tape over it such as
http://www.wickes.co.uk/Metal-Reinforcing-Coil/invt/240331
then bond and plaster.

 

[1john]

Even if your stairs were bolted into the wall every inch you will still have a crack forming on the plaster to string line if it has been plastered down too, this is because the wood will expand and contract alot faster than the wall and alot more than the wall. If the crack is right where the plaster meets the string then there is no point in removing 1" of plaster, just caulk the line.

 

[PrenticeBoyofDerry]

Think I misunderstood the op.
You can buy screws with larger screw heads.
You can also consider running joint tape along the crack and either fill out with filler, plaster or easifill.