ToughButterCup Posted May 20, 2019 Share Posted May 20, 2019 Our liquid floor screed is drying off: all windows and doors open all day - this weather is helping a lot I'm sure. Someone on BH suggested we put a sheet of plastic on the floor to see if there was any evaporation: a quick , dirty check. So I have done. When I remove the plastic sheet, the area covered by it is significantly lighter in colour than the area which has not been covered. Why would that be so? Instinct says the opposite might be the case (because there will have been less transpiration / evaporation). Anyone know why , first thing in the morning the screed is a lighter colour under the sheet than everywhere else? Link to comment Share on other sites More sharing options...
Ian Posted May 20, 2019 Share Posted May 20, 2019 (edited) How long has your screed been down? Screeds will only dry to the same humidity as the surrounding air so you’ve done the right thing in keeping the windows & doors open during the day. The air temperature in the morning at the moment is still quite low so I suspect that if your screed has now dried as far as it’s going to then your plastic sheet may be protecting it from getting surface dampness in the cold night & early morning air Edit: the relative humidity of the air inside the partly constructed house with no heating will be a lot higher at night than during the day Edited May 20, 2019 by Ian Link to comment Share on other sites More sharing options...
ToughButterCup Posted May 20, 2019 Author Share Posted May 20, 2019 37 minutes ago, Ian said: How long has your screed been down? [...] A month. 38 minutes ago, Ian said: [...] so I suspect that if your screed has now dried as far as it’s going to then your plastic sheet may be protecting it from getting surface dampness in the cold night & early morning air [...] Ah ha! The colour of the floor (away from the plastic) changes from off-white-ish in the morning to a biscuit / whiteish during the day. Other areas of the floor, not so well ventilated (corners, nooks and crannies) are visibly darker, but they too change colour a little during the working day. Very much more slowly, those out-of-the-direct-breeze areas are changing colours. Hence the need to keep the doors and windows open. Thanks @Ian 1 Link to comment Share on other sites More sharing options...
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