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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.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorSilky
    • CommentTimeJun 29th 2018
     
    I want to build a solid staircase. This is a retrofit and the location is in the middle of the building therefore precast concrete or casting concrete in place are too difficult. I don't want wood or metal in this location either.

    I was looking at this system. ( see picture here )

    http://www.archiexpo.de/prod/xella-ytong/product-55245-1132135.html

    I like the idea in principle but the mid-landing is really heavy to maneuver to the 2nd floor ( 300 kilos ) and overall the price to go up 2 stories to the roof is expensive.

    So I'm think of doing something similar, just I would use standard pre-cast concrete lintels for the treads and under the nose of the treads. I would use a short deep steel at the mid-point of each landing so that the landing can be made from 2 lintels that meet in the middle. Overall I will have solid masonry walls left, right, behind and center. The only opening will be where you walk..! This is the ideal thing for me as the materials are cheap and simple, I have cheap labour that can do it and it's easy to finish with plaster and get sound/fire tight.

    But what I want to know is, what's the catch? Can anyone blow a hole in this idea?

    I didn't find any examples googling and everyone seems to use pre-cast or cast on site concrete, which are both more technically difficult and expensive in this situation.

    The desired end result would be very similar to this only with a continuous spine wall in the middle http://www.mybaublog.de/das-fertige-treppenhaus/
    • CommentAuthorowlman
    • CommentTimeJun 29th 2018
     
    I've never tried it but I'd have thought that on site casting would be fairly easy. Stepped shuttering (strings), left and right, and sacrificial ply risers and a base, some concrete reinforcing mesh and cheap labour.
  1.  
    Over here we would use either cast on site as owlman said or welded on site stairs made up of 75mm x 50mm box section at the sides with same for verticals with angle iron welded to the inside to carry wooden treads with risers fixed to the treads. Steel is cheaper and quicker but nosier in use.

    If you use lintels how would you fix them to the walls?
    • CommentAuthortony
    • CommentTimeJun 29th 2018
     
    Build them in!
    For me landing in three or six pieces
    • CommentAuthorSilky
    • CommentTimeJun 30th 2018
     
    as Tony says, the idea is to build them in left, right and center

    The landing ca. 1 x 2.3 m could be as many as 12 lintels, 6 each side with a mid support ( steel from mid-spine to rear wall ), or maybe 6 x 2.6 m lintels if I can find them, but they would be around 100 kilos a piece, doable with 3 of us.

    @owlman the issue with concrete is it requires a degree of skill to get it set out correctly, which would then need me to do everything myself.. but I'm trying to delegate tasks to get things moving, it's a lot of mixing to pour 28 steps and 2 landings.. it wouldn't be convenient to have concrete delivered due to the location and it would get crazy expensive to keep having deliveries with a pump. To get precast sections in I would have to wait until the roof is off and get a crane.. or need a gang to haul everything, and so on.
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