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Shower Ventilation into Loft Space - Will This Dissipate Moisture?

Postby simonkbike » Mon Jun 30, 2014 10:31 pm

I want to fit an extractor fan to ventilate the shower in a very small bathroom (8 cu m) so an inline fan of 100 cu m/hr (30ltres/min) should be sufficient. It's a small flat with corresponding small HW cylinder so it won't sustain much more than a 10 minute shower at best.

The roof (1930's house) is unfelted so there's LOTS of ventilation through the tiles. Given the size of fan and likely limited throughput, do I need to fit a tile vent to duct condensation to the outside or can I just leave the duct open into the loft space (say high up near the ridge) and allow the natural ventilation through the loft to dissipate the moisture.

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Simply Build It

Postby thedoctor » Tue Jul 01, 2014 2:11 pm

You need to take the ventilation outside Simon. The moisture in the air will not necessarily "dissipate" it will simply hit the cold under-surface of the tiles and condense. This willintroduce moisture drips into the ceiling boards and damage the property.
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