Is the humidity in my Loft acceptable?

[vonsworld]

My loft is very well insulated with the recommended thickness of glass wool roll, it is also well ventilated.

To monitor the humidity I installed a remote humidity sensor and have been watching the results. The humidity seems to closely follow the humidity outside and gets quite high when it's raining or foggy. It's been up as far as 96%, but has never reached 100%, and was very low in the hot summer.

Is this normal and what you would expect? Is there any reason for concern?

 

[Harry Bloomfield]

To monitor the humidity I installed a remote humidity sensor and have been watching the results. The humidity seems to closely follow the humidity outside and gets quite high when it's raining or foggy. It's been up as far as 96%, but has never reached 100%, and was very low in the hot summer.

If it is well ventilated, then the outdoor humidity, will match the loft. Point is - is moisture regularly condensing, on the underside of the roof?

 

[ChrisJP]

The humidity seems to closely follow the humidity outside

Well of course it will if the loft is well ventilated - since it is continually exchanging loft air with outside air. That just shows your loft is properly ventilated - nothing to worry about, and it's very unlikely that they'll be any condensation forming because the air and the roof components will all be at the same temperature.