Squeaky Wall Stringers

[skybluescooby]

Help.
I have been blighted by squeaky stairs since i moved into my 9 yr old house, I have spent the best part of today dealing with these and can say i have tackled 90% of them.
The squeaks have gone from the treads/risers and now appear to be coming from the stringers, both sides flanked by plasterboard.
I have had a closer look and there is a variable mm gap between both sides and to hide this the builders have nailed on a decorative moulding.
I intent to remove this in order to combat the squeak then replace it when done, the question is , whats the best way to eliminate this problem. I have had two suggestions,
1- slap loads of pva down the gap or
2- slip some expanding foam down to compress the gap
Anyone have any other ideas or tips that have worked

 

[big-all]

heeelllooo sbs

you shouldnt have any gaps when new they should be wedged tight thats where a lot of the strength comes from !!!!!!!!

you can use talk it acts like a lubricant brush it into the areas where the squeeking is

 

[skybluescooby]

Cheers for that, The actual gap between wall and stringer varies from snug to 8mm, nothing unusual there, seeing as i work within the new build sector.
I think some expanding foam could do the job to give a bit of strength back, here goes i suppose

 

[TexMex]

you can use talk

I think having a chat with your stars to tell them to be quiet is over-rated. You could try some talc though

 

[skybluescooby]

talc in an 8mm gap or should i say void ? it will just fall through onto the floor i guess