Do you knowhowinsidewalls all of a suddendevelopdampspotson their inside surface? This is a typicalquestion put forwardby a residentof periodpropertiesat somemonthsof the year and most frequentlyin the Northern hemisphereof the world.Signs of damp areas on inside wallsis indicative ofan issuewith condensation.
How is Condensation Caused?
Condensation is brought aboutwhen heatedair inside the hometouchesa wallthat is too far below a certain temperatureto let this moisture laden airpassthrough it as moisture vapour. Instead oftravellingto the exteriorenvironmentas a gas the moisture transformsinto water and leavesdampspotson insideplasterboard. This processis known asthe Dew Point and it candifferin eachindividual homebut is usuallyactivatedat below6 degrees.
unsuccessful Treatmentsfor Penetrating Damp
The most frequentreactionto the presenceof condensation from penetrating damp on plasterboard and wallpaperis to turn up the heatingin the housein an effortto raise the temperature ofthe externalwalls and preventany damp walls from appearing. The logicbehind this is a wall with a temperature well above 6 Degrees willstopthe Dew Point being reached.
Not surprisinglythis methodwillnot workbecausethe widthof the wall would lead to having the radiatorsswitchedonat a very expensivetemperature 24 hours per daythroughout the coldwinter and autumn seasons.
Takingthe presentpriceof gasto try and run the heating non-stop would cost a small fortune!
Successful Damp treatments
The only really effective wayof permanently stoppingpenetrating damp in any dwellingis to waterproofthe externalfacadefrom water ingressviaporousbrickwork. This can be doneby applyinga water resistantoutsidepaint film straightonto the porous wallsof the building. Penetrating damp walls are caused by rain water being absorbed by the porous outer skin of the wall and then soaking through the structure by capilliary action to finally show up as wet patches or black mould on the inside.
As an alternative you can consider external rendering. Working with a a cement wall render is difficult when compared to using masonry coatings. Due to this fact it would be really recommended to hire a skilled plasterer.
Even though this route will undoubtedly cost a lot more you can be assured the finished job will be far better. Also the project will be finished quicker and will definitely be covered by a warranty.