MAINTAINING AN HISTORIC BUILDING
I HAVE AN 18TH CENTURY BRICK AND TIMBER COTTAGE AND ON ONE SECTION OF EXTERIOR PAINTED BRICK WALL A KIND OF 'BUBBLING' EFFECT HAS APPEARED, TOGETHER WITH DISCOLOURATION AND MARKING. THIS IS TO A HEIGHT OF ABOUT 800 MM. IN A SURVEY OF THE HOUSE 10 YEARS AGO, IT WAS DESCRIBED AS EFFLORESCENCE. IN THE LAST 10 YEARS THIS HAS TWICE BEEN SMOOTHED OUT, SEALED AND REPAINTED BUT THE BUBBLING EFFECT AND BROWN MARKING REAPPEARS AFTER A WHILE. I HAVE ASKED A COUPLE OF LOCAL BUILDERS ABOUT THIS BUT THEY HAVE BEEN UNABLE TO OFFER AN EXPLANATION OR PERMANENT SOLUTION, WITH A RECOMMENDATION TO 'REMOVE ANY LOOSE AREAS, SEAL AND REDECORATE' - BUT THIS HAS ALREADY BEEN DONE, TWICE, AS MENTIONED ABOVE. WHAT IS HAPPENING AND WHAT SHOULD I DO ABOUT IT?
First it is worth understanding efflorescence, a term that is often used with some abandon, as it can vary greatly as to what it is in the view of who is looking at it. It is a very general term that is frequently applied to any form of deposit with a crystalline appearance on the..