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Positive Input Ventilation opinions please?

Discussion in 'Home and Garden' started by broona, 14 Sep 2021.

  1. broona

    Mobster

    Joined: 28 Aug 2006

    Posts: 2,633

    Location: Hexham

    Our house is approximately 200yrs old and stone built, we've just had a damp proof course installed, and I'm looking to control the dampness in the long term.

    I've been told to fit a PIV, does anyone have any recommendations as to which one is best please, or any other options?

    It's just a relatively small 2 bedroom house, double glazed, 600mm thick walls, and very little ventilation as it stands.

    Thanks in advance.
     
  2. norm

    Soldato

    Joined: 21 Jan 2003

    Posts: 5,301

    How did they retrofit a DPC in stonework out of interest?

    I think a popular choice of PIV is the Nuaire Drimaster that sits in the loft, how appropriate that would be for an older property I'm not sure.

    It'd maybe be worth considering a unit that has heat recovery built into it so you aren't blowing cold air in during the winter months.
     
  3. NoobCannon

    Soldato

    Joined: 13 Jun 2011

    Posts: 5,569

  4. broona

    Mobster

    Joined: 28 Aug 2006

    Posts: 2,633

    Location: Hexham

    A copy and paste from the Peter Cox survey :-

    'We will install the Peter Cox Drywall horizontal damp proofing system into the correct mortar joint to the walls shown on the attached sketch plan.

    We will form the Peter Cox Drywall wall floor joint at the junction of the wall and floor to the walls shown on the attached sketch plan.

    Our quotation covering re-plastering allows for the following:
    Hack-off and remove existing plaster from the areas and heights indicated on the attached sketch, and clear resultant debris from site. Apply Peter Cox porestop coating to 500mm in height to the walls shown on the attached sketch plan. Re-plaster these areas in accordance with our specification for ‘DryWall Coating’.'

    Hopefully that makes sense. I've looked at the ones with the built in heater, but they're supposed to be extortionately expensive to run?
     
  5. broona

    Mobster

    Joined: 28 Aug 2006

    Posts: 2,633

    Location: Hexham

  6. Tom_ed1987

    Wise Guy

    Joined: 1 Mar 2004

    Posts: 1,712

    Location: Warwickshire

    Don't these things just make your upstairs really cold in winter and smell of musty loft?
     
  7. broona

    Mobster

    Joined: 28 Aug 2006

    Posts: 2,633

    Location: Hexham

    I guess that's what I'm trying to find out, but I hope not! :cry:
     
  8. NoobCannon

    Soldato

    Joined: 13 Jun 2011

    Posts: 5,569

    no. The air in most old houses loft is constantly changing as they are ventilated. The small amount of cold air that it blows into the house far out weighs the damp and black mould problems that arise from poor ventilation.

    as i said before ours has been great and we went from having to dry the upstairs windows with towels in the morning to almost 0 condensation on the windows.
     
  9. robj20

    Capodecina

    Joined: 9 Apr 2007

    Posts: 10,780

    How much extra heating does a house need using these. I currently use a dehumidifier for a couple of hours a day in winter.
     
  10. NoobCannon

    Soldato

    Joined: 13 Jun 2011

    Posts: 5,569

    tbh i Havent noticed our heating being on anymore than it was before we installed the unit our heating bill didnt go up.

    Undoubtedly if you stand in the hallway under the unit you can feel a slight cold breeze but how often would you stand in the hallway.

    you can get piv’s with heated returns but they use loads of electricity, its like Running a electric heater constantly.
     
  11. Molep

    Gangster

    Joined: 21 Mar 2016

    Posts: 185

    Location: Devon

  12. Thebug

    Wise Guy

    Joined: 17 Feb 2007

    Posts: 1,920

    Location: Walsall

    We also have the nuaire one above, we were constantly getting condensation on the windows, 2 days after installing the unit it had gone, it has 6 speeds but only have it on number 2, it turns itself off during the warmer months, and yes its a bit cooler on out landing where it is but nothing major, for me its worth it for not having to suck up the water every day with the karcher
     
  13. SoliD

    Capodecina

    Joined: 25 Feb 2004

    Posts: 15,919

    Location: Portsmouth

    Nuaire drimaster here and has worked wonders, no more condensation in the winter! I have the heater but it rarely kicks in, you can feel a slight cool in the winter but as above the benefits far out weight the cost.
     
  14. eviled

    Hitman

    Joined: 25 Sep 2016

    Posts: 812

  15. Siliconslave

    Man of Honour

    Joined: 11 Dec 2002

    Posts: 10,282

    Location: Darkest Norfolk

    thats really interesting - I get a bit of damp in some build in cupboard on an east facing wall and wonder if a small PIV would fix this.
     
  16. broona

    Mobster

    Joined: 28 Aug 2006

    Posts: 2,633

    Location: Hexham

    I've just read through that, the reason that we've had the DPC installed is to buy the house, and that link reads word for word what our survey report said, wish I'd seen it earlier, but hey ho! :cry: :mad:

    Thanks for all the replies, looks like the Nuiare is the one to go for, I'll get looking now
     
  17. Nugsy88

    Gangster

    Joined: 17 Jun 2016

    Posts: 193

    Location: Forfar, Angus

    Just bought the Drimaster eco hc which is linked above, thought about these a couple of years ago but ended up moving house. Awful condensation on the windows in winter (probably need changed). House was built in 1996 so will be nice to see what effect it has!
     
  18. a1ex2001

    Capodecina

    Joined: 14 Mar 2005

    Posts: 14,400

    Location: Here and There...

    Dry houses take less energy to heat so there is a balance somewhere between drawing in colder air and the ease of heating a dry house.
     
  19. Siliconslave

    Man of Honour

    Joined: 11 Dec 2002

    Posts: 10,282

    Location: Darkest Norfolk

    I'm not thinking it'd benefit the whole house so would make sense to install on into the landing, however i do wonder if it's be possible to take a small feed, like a hosepipe, off to the two cupboards that have the damp issues so i can finally keep them closed!
     
  20. Sin_Chase

    Capodecina

    Joined: 13 Jan 2004

    Posts: 20,607

    I put in a Nuair Drymaster in the upstairs landing area also. 1930s single block construction house which suffers condensate in the winters. Works very well and other than cutting the hole in the ceiling was very easy to install. My hole cutting exercise was difficult owing to a lathe and plaster ceiling, straight forward plasterboard will be easy!

    I considered the heat version but did not bother in the end. Don't really notice any issues with lower temperatures. I don't have hall control but for me it was a set and forget system.