MVHR before air tightness?

[anonymous]

This is for a retrofit. The reason why I ask is that I assume that if my house is super airtight, then that potentially leads to mould issues? 

 

Perhaps getting it done the other way around, would perhaps prevent mould issues? Or is mould issues simply rectified by opening windows? 

[JohnMo]

Not really clear what you are asking?

 

All really depends on what state the house is in, if you are living, showering in the house mould could be an issue, especially if not heated also. Or if there is no real humidity being developed,  mould issue not really there.

 

If you are building and living in property a good chance the duct work will end up with a good coating of dust if you start the MVHR.

 

If you are heating and living, I would crack the bedroom window open at night and open a window after a shower and take a hit on heating costs until building work is complete.  Better than filling MVHR ducts with dust.