ive had my hygrometer down for 3 days on a 80m2 screeded floor i did its been taking ages to dry the dial read 80 rh on the fith day of drying, then the day after i checked it rose to 90 rh. the shop has no windows that can open only the door so on a night its locked up theres condensation on the windows but the the screed looks dry, its changed colour to a light grey, is the hygrometer taking a reading of the room rh or is the screed soaking up the moisture out of the room when the doors are locked at night? screed looks dry but the box is still reading high.
moisture will take longer to dissipate as it's go nowhere to go. it's gonna rise up, can't go anywhere then settle back down again. pain you've got no windows to have ventilation to help drying
yeah i now what you mean, moistures finding a way out of the stone bricks under the windows, but is the hygrometer reading the floor rh ? or the room? can the screed look dry but really its high in rh?
There is no such thing as 'dry' looking . We proved this last week when we had the same bay with the same screed used but we made a slight alteration to the two halfs. The two halfs dried with two colours. 48hrs later , The dark colour was "dry" the light colour was "wet" work that one out ! If the hygrometer is going up and down it can be 3 things - The hygrometer has a Air leek and needs to be re-sealed The moisture is trapped in the air and at night if heating is going off its causing condensation.(jump of around 5% normal) The dpm is not working / damaged. If you read this week (16-23rd March) and it starts to drop a fair bit i would go with damaged dpm.
