what is this

bltchef

Hi I could any help me I have had a damp proof course and a rewire I am about to get my walls plastered strip the walls and found this the stain feels sticky any ideas what is my friend it could salt? It’s above the damp proof course and it has white stain and how can I fix it thanks :beer:

Mr_Warren_2

Looks like dampness to me (very stiocky and yaky feel to the hand). Check on the other side of the wall where that patch is, is there anything lying against said wall? Any sign of water penetration? leaking gutter? Poor rendering or joints? An internal wall of mine had this same feel to it. Behind it was the old coal bunker (transfoprmed in a wine cellar) but previous owner had made new concrete base that touched the brick wall. Damp was penetrating through this bridge. Broke 1" concrete off all around and the wall dried in days.

bltchef

its about 42 in off the floor is this still damp ?

ormus

could just be the old adhesive off the old paper?
scrape and then wash the walls with sugar soap.

Mr_Warren_2

Sorry guys but old wallpaper adhesive would have been dried by now. If it's wet it's penetrating damp. Check outside wall and not necessarilly wher the damp patch is. Water can come in at a different point and transfer to your plaster wall somewhere else. Once you have found the source of problem and you fix it, that should be the end of your problem.