Mould issues, requiring work or not? Done DIY or not?

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Hi everyone,

I’m dealing with a few issues at home and could really use some advice:

Air Filtration with PIV DriMaster:

I’m considering getting a PIV DriMaster for better air filtration and fresh air circulation. Will this help with air quality and mould prevention, or is it mainly for dealing with condensation (which I don’t currently get on my windows)?

After installing a PIV , the proposed solution after removing the boxed off toilet and cleaning the mould up is to clean and damp proof the mould from this in between the kitchen/toilet downstairs section between the studded wall. This would cost another £1000. Is this overkill for the issue at hand as the damp/mould in between will sort itself after the leak is gone? There was damp detected on this studded partition wall up to a certain level.

My mould issues seem to be purely from the fact there was a leak in the toilet downstairs and a leak from the roof upstairs, so is it more of a local leak issue? I have been seperately interested in the idea of having fresh air throughout the house without the windows being opened all the time, because for a long time I've found the house groggy to breathe in, but am concerned about the basic piv drimaster model running all the time, in case it becomes too cold in the house and hall. I've heard others turn it off when not sleeping to combat this and the basic version drimaster doesn't seem to have this option on some tutorial and review vids I found. I’ve seen some models have controls directly on the vent, but others switch etc.

Is it possible to have an electrician install the PIV instead of paying the £700+ installation fee?

In total this is going to cost after installing a new toilet and sink approx £1000 for the PIV Drimaster and £1000 for the knocking in of the wall and clean up for a £2000 + total.

Black Mould Issues:

I have black mould hiding behind cupboards upstairs that I've noticed since then, which is likely linked to the open roof issue causing water damage (roof tiles are giving way in another room/toilet).

If anyone has experience with PIV systems or dealing with hidden mould, your insights would be really helpful. Thanks!
 
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There are mould spores in the air, everywhere, all the time.

They will grow if they have sufficient moisture and a comfortable temperature.

Repair your leaks or other sources of water, ventilate your house, use an effective extractor in the bathroom and kitchen, do not drape wet washing indoors, open the bedroom windows every morning after throwing back the covers.

Then see what else needs to be done.
 
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Whilst most people see condensation on windows (principally because glass is thin and conductive of heat) it should be appreciated that (uninsulated) brick walls are also cold and will conduct heat away from the inside of a house.
Cupboards and wardrobes close to a (cold) outside wall will get condensation and hence mould on. Also if you use a portable gas fire that will cause condensation and black mould - you get a minimum of 1&1/4 litres of water for every Kg of gas burnt!
 

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