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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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    • CommentAuthorRex
    • CommentTimeSep 19th 2023 edited
     
    What ho one and all,

    The area I live in leafy Surrey(!) is undergoing quite a substantial new housing building program.

    One local 'field' listed on the government web site as flood plain with once in 100 year chance of flooding, will have around 100 new houses built.

    The Trust Pilot highly rated builder, Taylor Wimpey is about to open the show home.
    Reading the other thread regarding EPC rating, I would guess this house will be B+ or even A. But having watched it being built, i cannot understand how that could ba achieved?

    But of more interest to me, is the 'design' waste.' The show house does not have a fire place or stove but for whatever 'design' reasons, it does have a fibreglass chimney. My house does not have a fireplace or stove, and I did not fit a chimney.

    Obviously just a sales gimmick. Seems very strange and unnecessary cost, but what do I know?
    • CommentAuthorowlman
    • CommentTimeSep 19th 2023
     
    Are the houses of a flood resilient construction e g raised or on stilts? If they've resorted to sticking useless, twee fibreglass ornaments, on them I'd guess not. There will however most likely be lots of glass I'm guessing, and many en suites.
  1.  
    Surely the mortgage companies now have an aversion to houses built on flood plains. Doubtless the builders have a tame mortgage lender to provide the first mortgage - but I can imagine problems with the the second and subsequent ones. Do they never learn.

    In Poland I remember seeing houses built on a flood and they were all built on banked up earth about 1.2m above the land level. The soil was taken from the plot, most still had the hole in the back garden and some had converted the hole to a swimming pool. Of course the plots were about 2,000m2 so the pit didn't notice too much. I doubt that the above houses are on a plot anything like that size.
  2.  
    Flood plains are there to store water during a flood, so it doesn't flood towns downstream.

    If you build houses on embankments on a flood plain, they won't flood. But the water that would/should have been standing on that plot, will have to go somewhere else, ie downstream to flood someone else's home.

    That's why riverside towns which historically didn't flood, now do.

    Doubt whether the residents/builders of the new houses care, they're ok on their embankments.
    •  
      CommentAuthordjh
    • CommentTimeSep 19th 2023
     
    When I was very young I knew a young lady with a geology degree who was employed by the local water board but who left because of the frustration she felt at not being able to prevent houses being built on flood plains. So there's not a lot known now that wasn't known then and neither has the law been changed much AFAIK. Welcome to UK planning insanity. :devil: "The average developer will place a 4 bedroomed home on 1/8th to 1/16th of an acre!" :devil: :devil:

    I think I commented a couple of years ago that there were 'spare' fake chimneys sitting on one of the new developments near us. They're still there, but the houses are moving slowly towards them. The King (nee Prince of Wales) likes chimneys, don't you know. :cry:
    • CommentAuthorRex
    • CommentTimeSep 19th 2023
     
    OK, flood plain is probably not quite the right description but that is how it is listed on the government site. Unlikely to actually' flood' but certainly in the past, does get very very boggy. And no, the house are just normal trench foundations!!!

    But it is all OK as Taylor Wimpey have designed a 'sustainable urban drainage' solution, assuming that in 10, 20, 30 or more years time, the ditches have been kept clear for when that heavy rain thunders off the North Downs.

    There is another smaller site near by, and following a heavy downpour, I can only imagine that surface water kinda approached the front doors of a number of houses. The solution, a line of sandbags on the nicely landscaped grass verge and gardens.
    • CommentAuthorowlman
    • CommentTimeSep 19th 2023 edited
     
    Here's a piece re flood risk from the US, ( FEMA ) which you may find mildly interesting.

    https://www.massivecert.com/blog/fema-100-year-flood-zone-explained#:
    • CommentAuthorJonti
    • CommentTimeSep 19th 2023
     
    I work regularly on building sites of bigger building companies. During this time I have seen up close the quality of the construction as well as the care and attention lavished on the builds. I always give the same one piece of advice to anyone asking about my thoughts on buying a new house. Don't EVER, EVER buy a house from ANY of the bigger construction companies.
  3.  
    Like Owlman's link said - the term '100 year flood' is science jargon which is misleading for most people, it sounds like it won't happen for a long time eg '10, 20, 30 or more years'. It would be better to say '1% rate each year' but people don't understand that either.

    You can have 100-year floods in two successive years, or even twice in the first year.

    If a new build house in the 100-year zone stands for 100 years, then it is much more likely to be flooded sometime during its lifetime than it is to escape (actually 1-0.99¹⁰⁰ = 63% chance of flooding, 37% chance of escaping) and that flooding is every bit as likely to happen in the first year as in any other.

    For comparison the rate of house fires in the UK is about 0.1%pa, or 'a thousand year event', or 9% likely to happen during the lifetime of the house.

    When we think about all the building regs there are about fire protection, makes me wonder why we put up with so much higher rates of flooding.
  4.  
    Posted By: WillInAberdeenWhen we think about all the building regs there are about fire protection, makes me wonder why we put up with so much higher rates of flooding.

    Perhaps because the sort of flooding that happens on the flood plains in the UK doesn't cost lives whereas fires do. And maybe that big business wants to ignore the risk ahead of profit.
  5.  
    Two people died here in a flood a few weeks ago.

    There are usually 10-100 flood deaths a year in UK but there are not separate figures for deaths escaping from houses vs people getting caught up in rivers or flooded roads (as in the last incident) so difficult to tell.

    Also, for both fires and floods, there are very many incidents each year where everyone escapes, and just a few incidents each century where hundreds are killed, which tends to skew the stats. A single fire incident tends to affect one house, but a single flood incident usually floods many houses, also distorting stats.

    In most cases, the effects of fire and flood are the same, people have to move out and have their lives upended until the place is rebuilt.
    •  
      CommentAuthordjh
    • CommentTimeSep 20th 2023
     
    Posted By: Peter_in_Hungary
    Posted By: WillInAberdeenWhen we think about all the building regs there are about fire protection, makes me wonder why we put up with so much higher rates of flooding.

    Perhaps because the sort of flooding that happens on the flood plains in the UK doesn't cost lives whereas fires do.
    More to do with land prices and ownership methinks. Plus fire protection doesn't generally affect the appearance of a building too much whereas flood protection can and frequently does. If we were serious about fire protection, we'd mandate sprinklers or misters. It's too easy to take pot shots about flood protection.

    The headlines last night suggest we aren't even serious about keeping the planet habitable. :cry:
    • CommentAuthorRex
    • CommentTimeSep 20th 2023
     
    Not sure if I am going to get my facts right but I was on the parish Local Plan committee when this particular development was in the initial stages.

    At that time, X years ago, the UK gov flood maps did show this field as being in a low risk flood plain and all the locals know it gets very, very boggy. Nevertheless, the borough and county councils were happy to take the cash to give the go ahead.

    Subsequent meetings with all kinda of smoke and mirror drawings of SUD solutions (drainage ditches, holding ponds, etc), and a developer request to HMG to reassess the flood zones based upon the fact that there has not been any flooding in X decades, and the maps now reflect that. The field is no longer listed; the railway embankment provides a dam and the stream flows under it to the SUDs scheme. But the land will be tarmaced with driveways and roads, and most likely, gardens will become very very boggy, which will not be a surprise.

    But I guess the big developers with a serious bankroll know best!

    Now I am looking forward to viewing the show house and hear the answer to, if there is a chimney, where is the fireplace?
  6.  
    SUDS don't have anything to do with increasing or decreasing the likelihood of these particular homes flooding, despite what the developer or the parish councillors might think. They're there to protect other towns, miles further downriver, from the fast rain run-off that otherwise would rush through the drains and head off downstream. SUDS just slow it all down so the people further downriver don't get so much coming at them all at once.

    Flood zones in England are 'low risk' (less than 0.1%pa or 1000y); 'medium risk' (0.1-1%, 1000 to 100y) or 'high risk' ( >1%). Were the parish council clearly understanding which zone this is in?

    Most of central London alongside the Thames is 'high risk', but they still build tower blocks down there!
    • CommentAuthorlineweight
    • CommentTimeSep 20th 2023
     
    Posted By: RexNow I am looking forward to viewing the show house and hear the answer to, if there is a chimney, where is the fireplace?


    Fake chimneys are a bit of a silliness to me and I'd not want to buy a house with one - however, the answer is that lots of architectural design elements are essentially "symbolic" and are there because they convey to many people the idea of "house" in a reassuring way. See for example PVC front doors with fake raised panels and all sorts of other things. Even in classical architecture, all sorts of elements that have nothing to do with masonry construction and are remnants of timber detailing, retained for appearance only.

    Because much of our housing stock was built in the era when chimneys were functional things, and because much of our new housing stock is built in a "traditional" style, to many people that "traditional" style doesn't look right without the chimney they are accustomed to.

    Despite what lots of people will claim, the popularity of pitched roofs on domestic buildings isn't really due to functional superiority, it's because it matches what people expect a "house" to look like.
    •  
      CommentAuthordjh
    • CommentTimeSep 20th 2023
     
    Posted By: WillInAberdeenMost of central London alongside the Thames is 'high risk', but they still build tower blocks down there!
    That's probably the most sensible thing to build! More flats will be above the floods than low-rise construction, and the size of the building means they can do something appropriate with the ground floor (if they wished!). Traditionally all the public housing blocks in Singapore were built with a void ground floor, which got used for all kinds of things, but they seem to have stopped that now :(
  7.  
    Sometimes the Planners want chimneys as a design feature, especially in Conservation Areas or near them or just to fit with the surrounding character. But I have no idea why a volume house builder would put them on a new estate. It must be marketing led (like so many things).
    •  
      CommentAuthordjh
    • CommentTimeSep 22nd 2023
     
    • CommentAuthorlineweight
    • CommentTimeSep 22nd 2023
     
    The fake chimneys are there for the same reason as the fake glazing bars in the windows.
  8.  
    And the fake bricks cladding the (presumably?) timber frame walls.

    And the fake 'clay' roof tiles.

    It's no longer necessary for houses to look like they are made out of dried mud and heated with burning logs, there have been plenty of rendered-cubes-with-flat-roofs available for many decades now. But people like houses that look like.. houses! I do. Stone and slate are even better.
  9.  
    Yes - the problem is what the artificial facades hide
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