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ajrobb - what is a humidstat and where would it be? assuming it is a device to measure humidity in the house i am not aware of one. a quick google seems to indicate they look a bit like a traditional thermostat... so no, i think the fan is always on...

the place we have moved into has a loft/attic fan that pulls in [cold] fresh air from the loft and filters then circulates it into the upstairs landing. my understanding is that the aim of these fans is to improve air circulation and reduce condensation and mold. in this cold weather the fan...

woody - is there a solution to stop this issue in the future? i.e can the bricks be treated with something to prevent it getting worse?

as raised on this thread i have an issue with crumbling bricks: http://www.diynot.com/forums/viewtopic.php?t=230769 also there are a number of cracks in the wall. any idea what might be causing them?

i've only been here for 6 months so not sure if it is worse in winter...

I have a wall around my house with what look like fairly old bricks. While most are in good condition some (dotted all over the place) appear to be crumbling away to a powder, leaving the hard mortar hanging in mid air. Any idea what might be causing only certain bricks to turn to powder?