Garden room under construction - ventilate or lock up to reduce humidity?

[plockhart]

Hi,

 

I am constructing a timber framed garden room and I have not got electrics in it yet. It has insulation in the walls, a warm roof, and an insulated concrete base, and all the glazing is in. The humidity remains consistently high in it (95% humidity vs the 80% humidity outside) and I'm wondering should I try to do anything about it or worry. A few weeks ago it was particularly cold and there was condensation in the corners of the room (tiny sparkles near the top) as well tiny pools of water on the glazing on the inside along the beads.

 

I have 2 trains of thought:

- close all the trickle vents, cover the conduit holes I made in the wall (for feeding cables through etc) to try to raise the heat inside to reduce humidity

- open all the windows as well as the trickle vents to increase ventilation to lower the difference between outside and inside to reduce condensation

 

What train of thought is correct? I don't know much about how to think about the problem! Longer term I will have a air-to-air heat pump for heating and dehumidifying and will maintain it at a better ambient temperature

[Conor]

ventilate. The building is producing moisture, it needs to escape.

[Russell griffiths]

Extension lead and a dehumidifier 

[JohnMo]

dMEV fan install now and then forever more let it run 24/7. Cost about £1 a year to run. Set to min speed, buy a Greenwood CV2 from eBay pretty cheap.

 

This last year's humidity of our garden room 

 

[joth]

22 minutes ago, JohnMo said:

dMEV fan install now and then forever more let it run 24/7. Cost about £1 a year to run. Set to min speed, buy a Greenwood CV2 from eBay pretty cheap.

 

This last year's humidity of our garden room 

 

 

Very timeline thread. What sort of temperature is that room maintained at?

 

My garden room is a gym, so naturally gets a lot of humidity, and we positively don't want to heat it at all which means it's always sat at/below dew point and creating lots of pools of water esp around the door handles and window frames (cheap 2G). The trickle vents can't keep up.

I've set the A2A to do a dry cycle during overnight cheap rate, but it's already so cold that I don't think it can shift much by cooling the air to condense water out of it. For the little money it costs I'm very interested to give this dMEV a go.

 

Current situation

Edited January 29 by joth

[JohnMo]

5 minutes ago, joth said:

What sort of temperature is that room maintained at

We heat with a fan coil, but it only really gets secondary heat from the house UFH, ASHP circulation pump runs 24/7. So we generally have a min of 16, but it can get as high as 20 (currently) due to solar gain.

[plockhart]

Thanks for the replies all!