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Small Shower Room Ventilation.

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I was talking to a developer this morning. His son is a sparks. The two have installed a new 4 inch ceiling fan in a small upstairs shower room that has no windows. The building roof has been renewed recently and new breathable "felt" installed under the tiles. I had previously mentioned that the roofers could install a new roof vent for the fan ducting, but nothing has been done about this.


The developer says that the son advises terminating the air duct in the loft onto a bucket to catch moisture, which I said was not acceptable.


Bearing in mind that the new roofing "felt" (membrane) is breathable, is there any reason these days not to terminate the air duct directly into the loft space with no external grille?


Z.
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  • 0
    Unless the roof is an all plastic installation that does not mind getting wet, this is  a stupid idea !!.


    Assuming that the loft is cooler than the house in winter, and with insulation on the flat it will be  a lot cooler, insulation on the slope, just significantly cooler, water will condense on all cooller surfaces as damp air is added and meets objects below the dew point.


    It may work for long enough to cash the cheque for the money saved and run away, but the long term price is mould, damp and then rot.


    Please don't leave it, duct to the outside, either a vent tile or to the eaves and out but do not leave it open.


    A breathable membrane does not support the dispersal of large volumes of water vapour - it is not much better ventilated than the old tar paper of old once it had a few holes in it, and a lot less well ventilated than a traditional unlined roof. Suggest they try striking a smoke match and see how far it goes - there won't even be a breeze up there on a calm day..


    Mike.
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  • 0
    Unless the roof is an all plastic installation that does not mind getting wet, this is  a stupid idea !!.


    Assuming that the loft is cooler than the house in winter, and with insulation on the flat it will be  a lot cooler, insulation on the slope, just significantly cooler, water will condense on all cooller surfaces as damp air is added and meets objects below the dew point.


    It may work for long enough to cash the cheque for the money saved and run away, but the long term price is mould, damp and then rot.


    Please don't leave it, duct to the outside, either a vent tile or to the eaves and out but do not leave it open.


    A breathable membrane does not support the dispersal of large volumes of water vapour - it is not much better ventilated than the old tar paper of old once it had a few holes in it, and a lot less well ventilated than a traditional unlined roof. Suggest they try striking a smoke match and see how far it goes - there won't even be a breeze up there on a calm day..


    Mike.
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