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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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  1.  
    • CommentAuthorpmagowan
    • CommentTimeFeb 1st 2012 edited
     
    Hi guys. I am just trying to run some numbers on u-values as up to now I have been working on rules of thumb.

    Walls- 500mm thick random stone, block, rubble with 200mm EPS 70 Platinum = U 0.14
    Roof- 150mm EPS platinum above rafters plus 100mm fluffy plastic bottle rolls under rafters= U 0.104
    Windows glass- triple glazed, 2 lowE coatings, 1 low iron, Krypton fill, warm spacers= Ug 0.7
    Windows frame- just wood but isolated from masonry and partially overlapped by EWI= ??

    I have about 400m2 of walls of which about 80m2 is windows. The roof is another 400m2
    I have no floor insulation but will be putting the EWI down to founds and leca frence drain to make wing insulation.

    Heating will be a Lohberger with about 4kw to room and 6kw to water. There will be another wood stove with 10kw output for occasional use. Solar thermal on roof.

    There are 4 doors into the building. Front is a double door, wood outside and wood/glass inside. One (SG glass/wood) opens into insulated garage, one (SG glass/wood) into conservatory and one (SG glass/wood) direct to outside.

    300L thermal store in garage (heat from lohberger and ST)

    Airtightness to be optimum. About 1000m3 internal. MVHR (not decided on type but prob with underground inlet)

    30 miles North of Belfast.

    Would like to know your general thoughts. I don't understand all the PHPP and SAPs etc. It is retrofit to a large old house and will be part of a slow process as lots of DIY due to not being loaded!

    Thanks

    Oh, and this is all this forums fault :wink:
    • CommentAuthorPeter_S
    • CommentTimeFeb 1st 2012
     
    All sounds very reasonable. I would look at upgrading those doors for thermal and air tightness optimum.
    The roof, when you say insulation over and under, do you mean lower level is between rafters or are you creating an air space? In any event as long as the over rafter insulation and the EWI meet up properly you should have a good detail at the eaves.
    Not so sure about not insulating the floor. I get what you are saying about the below ground insulation and wing insulation but depending on your usage and heating schedule for the house, a solid ground floor could suck heat out of the system till it all warms up. Don't forget that a lot of comfort is about perceptions of warmth, so if your feet are cold it may feel worse than temp readings suggest. Also a cold floor could start to create convection currents until it gets up to temperature?

    Windows...the Uw will depend on your EWI to window overlap detail and the individual size of those triple glazed units, but sounds like it should be ok from your previous postings.

    All in all its going to be one hell of a lot better than where you started!! :bigsmile:
    • CommentAuthorpmagowan
    • CommentTimeFeb 2nd 2012
     
    I will try and upgrade the doors as much as possible certainly with regards to air tightness. I might put a second door on the single one to outside. The roof is 150mm plat EPS above the rafters and 100mm of fluffy stuff between the rafters, no gaps.
    There is the potential to insulate some of the floors with blown beads but some are solid and have no insulation and it would cause too much disruption to a nice kitchen I installed a couple of years ago to rip up. I am hoping the wing insulation will provide such a long path for thermal bridging that it will amount to something similar. It will, as you say increase thermal mass and will take longer to heat but that is not an issue as currently the house has lots of thermal mass and is about 8C internal with only a small bar heater in one bedroom to get it up to 14C to stop me dying!
    The windows would take too much work to put a thermal break in the frames I am afraid as they are completely DIY due to budget.

    Definately an improvement. I just hope it doesn't fall between two stones, as it were. :wink:

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