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HRV anxiety

  • 23-07-2010 10:40am
    #1
    Toplink
    Registered Users, Registered Users 2 Posts: 533 ✭✭✭


    Viking House wrote: »
    Hi SAS

    We airtightened an externally insulated timber frame extension and 2 QL extensions from the outside, and from a builders viewpoint we found it way easier and we will do this in future to all new builds.

    The Germans were no better in our Foxrock project, we spent a month ripping out plasterboard because they used inferior tape that peeled off under pressure and left out some membranes, we ended up with 0.8 airchanges there because we couldn't afford to spend any more time on it.

    We got to 0.58 with my brothers timber frame house but he didn't want to spend the money to get it certified, we spent 2 weeks getting it from 1.1 to 0.58 so its not easy, the Rathdrum energy plus renovation took nearly a month of work to get it down to 0.8, Arty will do a final test next week so fingers crossed.

    If you can imagine plastering your house with a 1-2mm coat of external insulation glue @ €1.50/m2 plus labour. Then fit the windows and fill the house with smoke from Archie's disco ball and turn on the fans. You will see the smoke billowing out through the holes from the outside which you mark and plaster when the pressure goes down.

    I've spent weeks on building sites doing airtightness and I can easily see that this takes all the headaches out of it, you can walk away then for 2 weeks and let the plumbers and sparks do what they want without worrying.

    But you gotta do your own thing!

    Roof's
    We're presently doing a Passive standard extension from QL blocks, we used a layer of plywood on top of the 150mm rafters as the airtightness line and put 150mm of EPS on top of the ply. The plywood overhangs the wall and has a few 2 x 2 stiffners on top. The plywood is taped to the external plaster where they meet. We used silicone between the plywood sheets to save money on tapes. We will use rockwool between the rafters and then plasterboard on the rafters with no vapour control membrane, the spots can go into the plasterboard just like before without airtightness boxes and the likes.

    Comments please!

    Folks,

    Slightly off topic.

    Can I just make one comment. Your making your house airtight so you are reliant on you MHRV system to distribute fresh air and get rid of stale air. To me the proper installation of this MHRV system is critical to the health and well being of the occupants.... How good are the installers of these systems, what training have they received? What knowledge do they impart to their clients on how to run/maintain these systems?

    I was in a friends house recently (new build) and I has a brief chat with the MHRV guy and observed his ductwork. I wouldn't like to be living in this bubble and be reliant on this fellas work to keep me breathing!

    Rant over.


    Back to ye're smoke pencils....


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