Massive subject this, anyone to kick off?
It's become the the norm though eh , but i suppose once plastered back up it forces any moisture the other way and hopefully outside , like i said very contentious subject this eh !! Flinnybigsegs said:but a lot of damp proofing companies hack off up to a metre high, inject the dpc (using whatever method) then plaster it back up..
what are they doing that isnt normal mate?
richardbrown said:Build a stud wall in front of the damp wall using foil back board with the boards 3 inchs from the floor, fit plastic skirting and lay a vinyl floor, I usually throw in a mop and bucket to sweeten the deal .
edit : more modern methods include the use of insulating board (cellotex) and a vapour barrier to stop condensation forming behind the board but just as good a method as any..
bigsegs said:yeh ive red similar aricles before..
first thing i spotted with that article..
the 'buy now' button.. nuff said on that one..
rising damp (or rising dampness as jeff puts it) is caused by the breakdown or non existence of the dpc or 'damp proof course', its a layer of impenetrable material built into the mortar joint just below internal floor level
this is built into every building (dwellings that is, not necassarily barns and the like, which tend to be thrown together by bog arabs) for the sole purpose of stopping water from rising up out of the ground and soaking into the porous substrates we build homes out of via capillary action..
dip a piece of blotting paper into a spillage of water and what happens?
anything porous will do exactly the same thing...
however it HAS always confused me how people always state that 'damp will only rise up to a metre'..
why should this be? does it think to itself 'well, a metres high enuff, if they cant spot me by now doing my evil deed im wasting my time!'
remember the mercury barometer from school? (if you cant, ask your teenage kids)
you take a thin hollow tube, fill it with mercury, seal one end and dip the other end in a bath of mercury.. it measures atmosperic pressure..
1 bar (roughly atmospheric pressure i.e. the weight of air 1cm2 rising up to space) will 'weigh' the same as roughly 76cm of mercury.. i.e. air pressure can only hold up 76 cm of mercury in this long thin hollow tube...
Now... replace the mercury with water, a lot less dense (less heavy) and what happens?
air pressure could hold up more than 15 METRES of water...
I dont actually think this has much to do wth capillary action in building substrates but it is the source of my confusion regarding damps apparent inability to rise further than a metre.. maybe early 'damp proofers' all had a bad back?
I do understand though that these 'damp meters' were invented purely for the purpose of ripping people off... they dont work (well they do but if youve actually got rising damp(ness) then believe me you'll see it long before you think about getting the 'damp proofers' in..
bit of a 'rogue traders' this article.. probably where they got their idea the other week..