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Viewing 15 posts - 1 through 15 (of 216 total)
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  • in reply to: Insulation around window in 9" brickwall #39241
    Tom Foster
    Participant

    You simply (if only it were simple) have to put a good thickness of insulation between inside air and any part of the external-skin brickwork. How thick the brickwork; where does the window sit in that thickness; therefore how much brickwork 'shows' inboard of the window frame?

    In addition, the frame will be a 'colder' thing, being in full contact with the cold outer skin and also not having any insulation brought across its outside face. So the frame will preferably have best possible PH-grade (or better) insulation within its section.

    Tom Foster
    Participant

    Carry the EWI down to base of foundation in a trench backfilled as a french drain! and minimise or omit the suspended floor insulation. Esp as it looks like you'd get a good deep downstand of insulation hence a good long path-length through soil, of heat passing down through the basement floor, curving out and up to surface. That 'thickness' of soil makes a good insulator. You'd also get a bone-dry basement and it would be part of the heated/habitable volume.

    in reply to: Purge Ventilation in Basements #39218
    Tom Foster
    Participant

    The current re-write of AD F makes a covert necessity of 24/7 Mechanical ventilation or MHRV – the hole-in-wall-type vent rates are eye-watering. In a current change-of-use 1 bed single aspect flat conversion 90,000mm2 'background ventilation; is required – equiv to a 12″ square hole! That's in addition to 'purge' (opening windows) and Kit/Bath 'extract'. Insane. By contrast. MHRV looks convincing – but client's not ready for that yet!

    in reply to: Icynene – alternative to Warmcel? #35835
    Tom Foster
    Participant

    That was 4 months ago …?

    in reply to: EWI insulation shrinkage #38537
    Tom Foster
    Participant

    Yes AFAIK all the artificial insulations pay for themselves multi multi times over. Insulation is the best possible use of oil/hydrocarbons, if you must. What was that podcast?

    … to take embodied energy into consideration. I think it would kill the standard if every item used in the building, and presumably all of the energy of the building process, had to be recorded

    It surely should be an essential part of the building process in general – though we and the world are still practically a long way from taking that on board – otherwise we're knowingly omitting about half the point.

    Paperwork – well that's something that's potential with BIM – on-the-fly embodied energy (in fact whole LCA) totalling as the design/documentation progresses – though again, the BIM cos haven't go round to incorporating that data/facility yet. Strangely, mech eng/product design software is much further aheads on just this, than building's, even though sustainability awareness is much higher in building than in engineering.

    in reply to: Breathable walls without MVHR #39175
    Tom Foster
    Participant

    Clare or anyone interested if I reply to this rather old thread? It's interesting but full of misconceptions, maybe by the German architect, I think.

    in reply to: Highest SAP rating? #39182
    Tom Foster
    Participant

    You mean because the energy generated, which is supposed to cancel the heating demand, all comes in the summer/daytime and is largely fed-back into the grid for paltry payment – leaving the winter/night heating demand to be expensively bought from the grid?

    Yes, come to think, it's as clear as that – which makes that 'trading' aspect of mainstay SAP completely irrelevant to reducing occupants' fuel bills (indeed systematically misleading) – therefore irrelevant also to 'fighting fuel poverty'.

    I wonder whether the politicians appreciate the latter effect of SAP? Someone needs to publicly trip a politician or two up, when they're boasting about what they're doing to reduce fuel poverty. That might bring a change in this anomaly.

    in reply to: Highest SAP rating? #39181
    Tom Foster
    Participant

    Is that bad actually? If it allows good SAP for a merely medium-insulation building, it's substituting capital expenditure on hi-tech for same on average-tech insulation and airtightness, for same result as far as carbon, energy demand etc.

    Yes, having installed energy generation equipment, it's then depriving the nation of that energy product, by 'squandering' it. There might be questions about uncounted eco-footprint resulting from hi-tech, compared to lots of EPS and sticky tape. What else makes the SAP trade-off wrong? It's against 'fabric-first' ideology, but what really is the objection?

    I sometimes think this kind of thing is OK as long as the energy product is so lo-grade that it can't possibly be seen as tradeable energy commodity – can't be used anywhere except very close to where it's generated (or captured). That is, lo-grade heat. The building itself captures its residual heat demand from the sun. That seems OK as long as it's coming in through windows, but not OK if it's done via solar collectors on the roof.

    in reply to: Highest SAP rating? #39179
    Tom Foster
    Participant

    Interesting – anything more on this?

    in reply to: Passivhaus Modelling with Ecotect #39185
    Tom Foster
    Participant

    What a great and painstaking reply from Adesk – wish my chosen Cad provider could or would express themselves so well.

    in reply to: Passive irrigation #39146
    Tom Foster
    Participant

    Going to consult online leaky pipe specialists – any day now! Tell me what you find out?

    in reply to: Passive irrigation #39144
    Tom Foster
    Participant

    I have 2 x 2000 litre ex-orange juice barrels (4 tonnes of rainwater) up the slope, providing 4-6m head to leaky pipes in 6.7 x 3m polytunnel. Lasts about a week in dry summer! Ordinary leaky pipes need more pressure than that, so am looking for lo pressure replacements, and tripling the storage.

    Tom Foster
    Participant

    I'd also get into Linkedin, incl Linkedin Groups, do more on this forum https://www.aecb.net/forum and also http://www.greenbuildingforum.co.uk .

    in reply to: Climate Data for Ghana #39101
    Tom Foster
    Participant

    Does Meteonorm cover Ghana? It generates climate files for any location, interpolating/extrapolating from a large array of weather stations. Christian from WUFI/Fraunhofer says these are good enough except for missing driving rain data, which is important in WUFI but prob not in PHPP (or in Ghana!)

    in reply to: Therm and WUFI forums, Linkedin Groups etc #39100
    Tom Foster
    Participant
Viewing 15 posts - 1 through 15 (of 216 total)