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Airtightness in building

  • 09-02-2009 8:58am
    #1
    Slates
    Registered Users, Registered Users 2 Posts: 344 ✭✭


    A what stage in making a building airtight should you consider changing from passive to mechanical ventilation?

    Is it worth going to alot of trouble and expense if your not using MHRV


Comments

  • #2
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    Slates wrote: »
    Is it worth going to alot of trouble and expense if your not using MHRV

    Yes, its the Law for any house granted after 30th June 2008 or not substantially completed before 30th June 2009.

    The Building Regulations are a minimum standard, which will improve peroidically. Air tightness will be a stardard - if you don't have it your house will be sub-standard! (if / when put up for sale)

    Air tightness prevents draughts, air loss and therefore heat loss - it saves money over the long term.

    Check out Siga, ProClima & Moy web sites. Two companies run 1 day installation course' in Ireland. The level of airtightness achieved dictates the need for MHRV.

    MHRV could be retro-fitted in the future. They may become smaller, quiter and cheaper.


  • #3
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    At Q50/7 - draft TGD F requires that you increase background ventilation ( holes in walls or windows trickle vents ) by 50%

    At Q50/10 TGDL 2008 minimum I have found DEAP calcalutes a running cost vs energy saved cost neutral

    A "consensus" I have found in talking to HRV installers is that Q50/ 5 is the "cut off point" i.e. if you don't achieve 5 you dn't use HRV . This dovetails with the BRSRIA report BG 4 / 2006 report which deems for houses , mechanically ventilated , Q50 /5 Normal Practice and Q50 / 3 Best Practice

    That's the tekky answer slates . But as RKQ says - most definately air tightness is not simply "a lot of trouble" . It is most worthwhile


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