![]() Other solutions? Keep the heating on high all night. See how much less wet the panes are in the morning. Whichever room that grey damp wall is in, crack open the windows to 'vent' setting overnight. Not only that, but bedrooms tend to suffer most simply 'cos bods release about a litre or more (?) of moisture overnight. The cooler air cannot hold on to that moisture any more, so it condenses out, starting with the coldest surfaces like window panes, and that wall. Then comes t'night, and the CH goes offski and the flat cools down - as does the air within. Any water in the flat will evaporate more quickly and be held in the air - that's everything from you, your cooking, showers, damp socks, etc. Here's the thing - warm not only can hold more moisture, but actively does. In the evenings in your flat, you presumably turn on your central heating and do stuff like living? Question - are you window panes also damp in t'mornings? That Wallrock stuff will be the easiest way to do this. ![]() So, if your wall happens, for some reason, to be particularly cold, then it needs insulating. Mind you, if a surface is particularly cold - like this wall might be - then water will condense on it even under ideal conditions (take a cold can of beer out of the fridge and see the beads form on it). The only way to prevent condensation is to (a) prevent it forming in the first place (eg don't breathe), (b) hold it in the air by increasing the air temp - and keep it high, or (c) ventilate it out. Perhaps it's something weird like the blocks absorbed more heat during the day, so the blocks are 'warmer' than the mortar?! I doubt it's that, tho'. That it seems to be happening on your wall simply indicates that the mortar lines are cooler than the rest of the wall. The air around you holds a lot of moisture.Ĭhust how much it can hold before it can't hold any more depends largely on the temp of the air, with warm holding more.ĭuring the night when the air cools, it cannae hold some of that moisture any more, and it'll start to condense oot on the coldest surfaces first.
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