Very basic design question - from 'the other side'.

[Ermintrude]

Why cold?

Humidity would need to be low or if house and outside close in temp dew pt on outside face of wall. Temp grade need to be low?

 

[Ermintrude]

What was wrong with my idea then?

Dosnt shift enough moisture . If you want to eliminate it in wall need a 300kw dehumidifier ! All that is is a pump with some carbon and poly filters

 

[bennygas]

Surely there's a bit more to em than that? In the blurb I've seen, reducing condensation is sold as one of the benefits. I'd wanna be sure there wasn't a damp or water ingress issue partly cos the problem appears localised before going to the trouble of external insulating render etc. quite like the idea of the render though.

 

[Ermintrude]

Yep garden walls are brilliant for this also down pipes discharging against house at bottom. Or concrete / impermeable footways built against house. When