Triassic Posted May 3, 2018 Share Posted May 3, 2018 Since we moved into our air tight cabin we’ve noticed a slight Mould problem around the places we remain stationary for long periods, behind the headboard and above the Work from home desk (the wife sits here for the best part of nine hours per day). Any thoughts on what’s going on and the cure? Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 3, 2018 Share Posted May 3, 2018 28 minutes ago, Triassic said: Since we moved into our air tight cabin we’ve noticed a slight Mould problem around the places we remain stationary for long periods, behind the headboard and above the Work from home desk (the wife sits here for the best part of nine hours per day). Any thoughts on what’s going on and the cure? More info please ! PiV / Trickle vents / MVHR ? Link to comment Share on other sites More sharing options...
Triassic Posted May 3, 2018 Author Share Posted May 3, 2018 Only trickle vents at the moment. The cabin is only 35m2. Open to suggestions. Link to comment Share on other sites More sharing options...
ProDave Posted May 3, 2018 Share Posted May 3, 2018 Insulation level? I am guessing not good as you need a cold surface for moisture to condense and start mould. Having been in the caravan for over a year and through a cold winter, I can assure you you need a LOT of ventilation to keep condensation at bay. A blast of the dehumidifier from time to time helps dry things out. Link to comment Share on other sites More sharing options...
Dudda Posted May 3, 2018 Share Posted May 3, 2018 I'd say it's still drying out and not near enough ventilation. It's so small and you are both producing a lot of moisture breathing, cooking, showering, etc. Are you planning MVHR or DCV? Link to comment Share on other sites More sharing options...
SteamyTea Posted May 4, 2018 Share Posted May 4, 2018 Maybe be worth a couple of very small fans on timers, see if things improve. If they do then you know it is a local problem and not a general one. 1 Link to comment Share on other sites More sharing options...
Triassic Posted May 4, 2018 Author Share Posted May 4, 2018 (edited) 145mm of Kingspan inside 150mm Timber Frame, walls and roof. 300mm in floor. Edited May 4, 2018 by Triassic Link to comment Share on other sites More sharing options...
mike2016 Posted May 4, 2018 Share Posted May 4, 2018 A lot of tiny homes have the same issue. I recall that they recommend purging the air by opening all the windows daily. There's an article here worth looking at: https://tinyhousebuild.com/how-to-save-your-tiny-house-from-mold-and-moisture-issues/ Some type of active ventilation will most likely be necessary.....there's one mentioned in treehugger: https://www.treehugger.com/tiny-houses/leaf-3-tiny-house-designed-seriously-cold-climates.html http://www.lunos.de/en/product/e_with_heat_recovery/ Less ducts but any active system would help.....you need to move air through the property if possible..... Link to comment Share on other sites More sharing options...
jack Posted May 4, 2018 Share Posted May 4, 2018 You can get through-wall extractor fans that have some heat recovery. They aren't very efficient compared to proper ducted MVHR units, but still better than constantly opening windows to get fresh air in. Edited to add: Missed the previous post - the Lunos unit above is what I was talking about. Link to comment Share on other sites More sharing options...
joe90 Posted May 4, 2018 Share Posted May 4, 2018 Yes our last house which we rent out has the same mold problem, double glazing was installed before we bought it but with no trickle vents!!!. I told them they needed to open windows daily but they don’t appear too. Link to comment Share on other sites More sharing options...
SteamyTea Posted May 4, 2018 Share Posted May 4, 2018 I think this is an idea opportunity to make a cheap MVHR unit. Not that hard. Link to comment Share on other sites More sharing options...
Triassic Posted May 4, 2018 Author Share Posted May 4, 2018 Great idea, I have some space under the kitchen units. What would I need? Anyone got any design details? Link to comment Share on other sites More sharing options...
jack Posted May 4, 2018 Share Posted May 4, 2018 Do a search for "DIY MVHR". Someone posted a link to this: http://handmadematt.blogspot.co.uk/2015/01/heat-recovery-ventilation-heat.html Note that this is a crossflow unit, rather than the counterflow approach which is used in commercial units. Crossflow is easier to make, but has a hard limit on effeciency of (from memory) 75%. Real-world will be a lot lower. Link to comment Share on other sites More sharing options...
Onoff Posted May 4, 2018 Share Posted May 4, 2018 This thread I started? Link to comment Share on other sites More sharing options...
SteamyTea Posted May 4, 2018 Share Posted May 4, 2018 I shall try and find some pictures of mine. About time I did Mk3. Link to comment Share on other sites More sharing options...
Onoff Posted May 5, 2018 Share Posted May 5, 2018 10 hours ago, SteamyTea said: I shall try and find some pictures of mine. About time I did Mk3. Please do. Pretty sure you were going to look for me one time. Link to comment Share on other sites More sharing options...
SteamyTea Posted May 5, 2018 Share Posted May 5, 2018 I was, on your timescale. Truth is I hate going up in the loft, it is depressing because of all the junk up there. Link to comment Share on other sites More sharing options...
Triassic Posted October 20, 2018 Author Share Posted October 20, 2018 On 04/05/2018 at 22:29, SteamyTea said: I shall try and find some pictures of mine. About time I did Mk3. Did you ever find those photos? Link to comment Share on other sites More sharing options...
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