Wall plate gap

[camerart]

Hi,

In my living room there is a wall plate on to top of a wall, a few inches inside the outer wall of a 1906 house. There is a damp proof course between the little wall and the wall plate, that looks like treated cement, it's black. A 2-3mm gap has developed between the wall and the wall plate, so when anyone walks along that wall the floor bangs up and down.

I assume to do the job properly, the wall should be re-built, but this is quite a big job. I want to know if there is a quick fix way to fill the gap?

Any suggestions please?

Cheers, Camerart.

 

[themiddleagedun]

I would wedge between the wall & timber with slate or plywood packers every foot or so then point the rest of the gap with mortar.

 

[gregers]

if you can do this standing on the oversite,so you dont weigh the floor down.
jack the floor up,cut a load of dpc strips and pack up the wall plate,lower the floor.

 

[camerart]

I can only jack up to till the floorboards hit the skirting board, and the gap is just over 2MM. I'll try to slide some DPC in, if there's room.

Thanks, Camerart.

 

[camerart]

As there was little room, I packed DPC (tar based) into the gap, and it did the trick, thanks for both replies.

Cheers, Camerart.