wrong technique screed drying?

[Post and beam]

10 hours ago, Nickfromwales said:

But you’ve got to move the air out of the house, not just the room. 

Its certainly getting out of the house, doors and windows open on the extract side. As i said earlier the fan is moving 100 cfm. That is a large volume of air. 

[Nickfromwales]

2 minutes ago, Post and beam said:

Its certainly getting out of the house, doors and windows open on the extract side. As i said earlier the fan is moving 100 cfm. That is a large volume of air. 

Then tiling before xmas is a distinct possibility sir!  

[Post and beam]

'the general level of moisture in the house has an impact on the drying speed of the screed. '     agree, which is why i think the volumne of outside air i am blowing through the kitchen should have a lowering effect on the overall RHI %.      Remember that my original question was about the fact that the 'meter box' % goes up again over night when the fans are not running.  As Nick suggested i think i will lift and move the test box and see if the behaviour changes.

[Post and beam]

10 minutes ago, Nickfromwales said:

13 minutes ago, Post and beam said:

 

Then tiling before xmas is a distinct possibility si

Thanks Nick.    Tiling by early july was the target

[Kelvin]

7 hours ago, Post and beam said:

'the general level of moisture in the house has an impact on the drying speed of the screed. '     agree, which is why i think the volumne of outside air i am blowing through the kitchen should have a lowering effect on the overall RHI %.      Remember that my original question was about the fact that the 'meter box' % goes up again over night when the fans are not running.  As Nick suggested i think i will lift and move the test box and see if the behaviour changes.

Do you think it could be how you’re measuring the RH rather than how dry/wet the floor is. It seems to me that leaving the box stuck to the floor for an extended period of time will allow moisture to build up inside it giving you a false reading. I expect it will read lower if you move the box. 

[JohnMo]

8 hours ago, Post and beam said:

fan is moving 100 cfm. That is a large volume of air

It's not really that big a volume. To put it into perspective, a 200m² house with MVHR would be moving 50% more that 24/7/365.

[Post and beam]

37 minutes ago, JohnMo said:

To put it into perspective, a 200m² house with MVHR would be moving 50% more that 24/7/365.

From the Brink website....

 

'The 400 stands for an airflow of 400m³/h'                                          so that would be 100m³  every 15 minutes. I just realised i used the wrong units previously. My fan is moving  100m³/minute. 

[saveasteading]

Doors about windows will do all the air movement you need, in dry weather in June.

 

[JohnMo]

You said up thread 100 cfm? Can only comment on what is written!

 

Because your Brink can flow 400m³/h doesn't mean you set to flow that. You set to building regs. 

[SteamyTea]

The physics of cement cohesion

 

All answers are above.

Good luck, it is a technical read.

[Post and beam]

13 minutes ago, JohnMo said:

You said up thread 100 cfm? Can only comment on what is written!

Agree totally, my mistake.

[Nickfromwales]

Should be dry by the time we finish discussing it here tbh lol.

 

Move the box about, as I said, to gauge the readings at different locations.