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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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General: MVHR legal requirement in new build?

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  1.  
    • CommentAuthordickster
    • CommentTimeNov 28th 2008
     
    Hello everyone.

    Do I HAVE to install MHVR in a new build? If not what other options could I use in what should be a really good airtight and very well insulated building?

    (planners accepted new application in principal!)
  2.  
    Posted By: dicksterDo I HAVE to install MHVR in a new build? If not what other options could I use in what should be a really good airtight and very well insulated building?


    If your house really is airtight, why wouldn't you want to install a MHRV system? Or would you want to put up with condenstation, mold and variable interior air quality?

    If you're building tight, you should ventilate right.

    Paul in Montreal.
    •  
      CommentAuthoragu
    • CommentTimeNov 28th 2008
     
    I think and am sure I'll be corrected if I'm wrong, if you are aiming for under 5ach/per/hour which I am assuming you are for a really good airtight building it is highly advisable ( possibly required) to use an MHVR. But as Paul says why wouldn't you if you are building airtight?
    • CommentAuthorMatt
    • CommentTimeNov 28th 2008
     
    As the others have said, assuming you have a very well insulated, air tight building, why wouldn't you - its great!
    • CommentAuthorCWatters
    • CommentTimeNov 30th 2008 edited
     
    I don't believe a MHVR system is mandatory but having installed on in my house I would definitly do so again. It's great not having condensation on windows and the house has a much fresher feel to previous houses we've lived in.

    I guess you could look at a passive stack approach rather than a MHRV but I don't know much about those.

    http://www.ubbink.co.uk/whole_house_vent/psv.htm

    Appears to be similar to leaving a chimney open.
    • CommentAuthordickster
    • CommentTimeDec 1st 2008
     
    Ta all,

    Have no problem with MHVR, but prefer to have the luxury of choosing it rather than having it stuffed down my throat. Seeing as it appears not to be a legal requirement, I will, of course, choose it!

    Thanks again
    • CommentAuthorLizM
    • CommentTimeDec 1st 2008
     
    Part F of the building regs shows different systems which are acceptable. You can find the approved document through the planning portal website.
    • CommentAuthorCWatters
    • CommentTimeDec 1st 2008
     
    Worth remembering that the Approved Documents aren't the law just guidance. If you can convince your BCO that your own method achieves the same objectives as the AD and meets the Building Act then they should allow it. Easier said then done sometimes though.

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