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Building in stages - possible moisture issue?

  • 09-07-2014 6:21pm
    #1
    joeirish
    Registered Users, Registered Users 2 Posts: 460 ✭✭


    We are planning to build our new house in stages due to a number of factors. Our thoughts were to get the foundations and sub-floor done, then the timber frame structure, followed by the external skin, roof and windows. Then have the insulation and airtightness done. Planning to do this over the next couple of months and have completed by end of September. Then leave it until the next tranche of money comes through in February.

    The concern is that with ACH of around 0.6 will there be a build up of moisture without HRV working (not installed and no electrics until second phase). And will this cause damage to internal timber on windows (blue stain mould)?

    We could leave it all till Spring if this was a better option.

    Thanks


Comments

  • #2
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    Its funny you posting about mould in air tight house, our house suffered terrible mould all over mdf window boards, just after plastering couple of weeks ago, moisture resistance boards all treated with sealer.


  • #3
    893bet
    Registered Users, Registered Users 2 Posts: 9,374 ✭✭✭893bet


    Would keeping windows open not provide the ventilation?


  • #4
    joeirish
    Registered Users, Registered Users 2 Posts: 460 ✭✭joeirish


    I was concerned that keeping the windows open would increase moisture in the window frames as they are treated with a micro- porous (breathable) stain/paint.


  • #5
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    joeirish wrote: »
    I was concerned that keeping the windows open would increase moisture in the window frames as they are treated with a micro- porous (breathable) stain/paint.

    Its the opposite: you have to open the windows to dry out the house - or use a dehumidifier.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #6
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    joeirish wrote: »
    We are planning to build our new house in stages due to a number of factors. Our thoughts were to get the foundations and sub-floor done, then the timber frame structure, followed by the external skin, roof and windows. Then have the insulation and airtightness done. Planning to do this over the next couple of months and have completed by end of September. Then leave it until the next tranche of money comes through in February.

    The concern is that with ACH of around 0.6 will there be a build up of moisture without HRV working (not installed and no electrics until second phase). And will this cause damage to internal timber on windows (blue stain mould)?

    We could leave it all till Spring if this was a better option.

    Thanks

    I assume you when you say the TF structure, followed by the external skin - including plastering - that these will be done sequentially, effectively as one job - the limit is usually that the skin must be on within 90 days - but I'd never leave it anything like that. I'd have the blocks up the minute the frame is done, and then plastered. Besides, it's cheaper that way.

    I would make the TF, external skin incl plastering, roof incl slates and guttering all one job.

    And, depending on what time of year you're talking about, you don't want to put up a frame that may accumulate moisture, and then come along and seal that moisture in with insulation etc. That would be the worst case scenario.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



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  • #7
    joeirish
    Registered Users, Registered Users 2 Posts: 460 ✭✭joeirish


    galwaytt wrote: »
    I assume you when you say the TF structure, followed by the external skin - including plastering - that these will be done sequentially, effectively as one job - the limit is usually that the skin must be on within 90 days - but I'd never leave it anything like that. I'd have the blocks up the minute the frame is done, and then plastered. Besides, it's cheaper that way.

    I would make the TF, external skin incl plastering, roof incl slates and guttering all one job.

    And, depending on what time of year you're talking about, you don't want to put up a frame that may accumulate moisture, and then come along and seal that moisture in with insulation etc. That would be the worst case scenario.

    Thanks for the replies so far. Yes we are doing this sequentially but as more or less one job (there may be slight delays due to bad weather slowing down the roofer for example). Once the structure is up then we would have the windows installed withing a few weeks (again only subject to delays due to missed dates by the window company). So we would end up with a house that was essentially fully built from the outside but no inside work being done until maybe four or five months after. that is the scenario I am wondering about.


  • #8
    galwaytt
    Registered Users, Registered Users 2 Posts: 12,822 ✭✭✭✭galwaytt


    joeirish wrote: »
    Thanks for the replies so far. Yes we are doing this sequentially but as more or less one job (there may be slight delays due to bad weather slowing down the roofer for example). Once the structure is up then we would have the windows installed withing a few weeks (again only subject to delays due to missed dates by the window company). So we would end up with a house that was essentially fully built from the outside but no inside work being done until maybe four or five months after. that is the scenario I am wondering about.

    Why wouldn't you order the windows in advance, off plan ?

    Still wouldn't leave it open, esp the roof.

    Ode To The Motorist

    “And my existence, while grotesque and incomprehensible to you, generates funds to the exchequer. You don't want to acknowledge that as truth because, deep down in places you don't talk about at the Green Party, you want me on that road, you need me on that road. We use words like freedom, enjoyment, sport and community. We use these words as the backbone of a life spent instilling those values in our families and loved ones. You use them as a punch line. I have neither the time nor the inclination to explain myself to a man who rises and sleeps under the tax revenue and the very freedom to spend it that I provide, and then questions the manner in which I provide it. I would rather you just said "thank you" and went on your way. Otherwise I suggest you pick up a bus pass and get the ********* ********* off the road” 



  • #9
    dathi
    Registered Users, Registered Users 2 Posts: 1,422 ✭✭✭dathi


    joeirish wrote: »
    We are planning to build our new house in stages due to a number of factors. Our thoughts were to get the foundations and sub-floor done, then the timber frame structure, followed by the external skin, roof and windows. Then have the insulation and airtightness done. Planning to do this over the next couple of months and have completed by end of September. Then leave it until the next tranche of money comes through in February.

    The concern is that with ACH of around 0.6 will there be a build up of moisture without HRV working (not installed and no electrics until second phase). And will this cause damage to internal timber on windows (blue stain mould)?

    We could leave it all till Spring if this was a better option.

    Thanks
    how do you plan on complying with the new building control act re getting the property certified


  • #10
    joeirish
    Registered Users, Registered Users 2 Posts: 460 ✭✭joeirish


    I started the build before the new regs came in.

    I've decided to go ahead with the build and just makes sure it is well ventilated if it has to be left for a few months. Thanks for the replies and advice.


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