Copyright GTR-Computers 2012
What is Rising Damp? Rising   damp   is   caused   when   water   from   the   ground   spreads   into   the   brickwork   by means   of   capillary   action,   rising   through   fine   cracks   in   the   masonry.   It   is   usually found only in the first metre or so of the wall. Since   1875   all   new   houses   built   were   constructed   with   a   damp   course,   essentially   a membrane   or   waterproof   barrier   built   into   the   walls   to   prevent   the   problem.   However, rising   damp   can   affect   any   property,   however   well   treated,   if   the   damp   protection   is “bridged”   –   for   example   when   a   patio,   path   or   raised   flowerbed   is   built   against   the house above the damp course. It is more common than you might imagine. However, it is often misdiagnosed by inexperienced builders. Make sure the problem is not, for example, leaking guttering, faulty or leaking plumbing or condensation caused by inadequate ventilation. Symptoms Rising   damp   will   almost   always   mean   damp   patches   and   stains   up   to   about   one   metre up the wall. Only if it has been allowed to go unchecked will it have spread higher up. Look   at   the   exposed   surface   of   the   brick.   Check   to   see   if   there   are   salts   forming,   that the   brick   is   actually   wet   –   not   just   the   wallpaper   or   paint,   that   there   is   no   mould   present and   whether   the   skirting   board   is   showing   signs   of   rot.   Other   easy-to-spot   symptoms   of        rising damp include stained or lifting wallpaper or softening plasterwork. Treatment The   common   treatment   is   to   install   a   damp   proofing   course.   This   generally   involves stripping   away   the   sodden   skirting   board   and   plaster   to   expose   the   brick   up   to   about one   meter.   Holes   are   then   drilled   and   a   silicone-based   chemical   injected   into   the brickwork.   The   chemical   seeps   through   the   brick   and   the   mortar   to   form   a   new   barrier against   damp.   When   that   is   done   the   wall   is   re-plastered   with   sand   and   cement containing a waterproof additive. If   an   external   feature   like   the   patio   or   flowerbed   is   to   blame,   the   damp   can   be   cured by   lowering   it   below   the   level   of   the   original   damp   course   and   then   allowing   the   area to dry out naturally by opening windows and heating the room.
Tel: (01945) 465099
Tell Tale signs of Rising Damp on exposed brickwork Stained wallpaper caused by Rising Damp Damp plaster has to be removed and wall treated