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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.

Buy individually or both books together. Delivery is free!

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    • CommentAuthormarsaday
    • CommentTimeJun 22nd 2018
    I need to put in two concrete lintels on my extension. The BC guy says i can use the small 65 x 100mm lintels.

    I am sure he is correct, but i thought i would ask here to check.

    My first lintel will span 90cm and be above a door. Above it will sit more block work and then the roof will load onto this wall as well. At the corner of the door area higher up will be an oak beam which will continue taking the roof load to the other side of the extension.

    The second lintel is taking very little weight. No roof load, just a small section of external brick work. The span here is 130cm.

    I can see the small 65mm lintel will be fine here, but i was thinking maybe use a 140 x 100mm lintel over the door due to the higher loads from the roof above.
    • CommentAuthortony
    • CommentTimeJun 22nd 2018
    These lintels are surprisingly strong especially with blockwork above them, they don’t like direct point loads.

    I reckon 65mm ones will be OK
    • CommentAuthormarsaday
    • CommentTimeJun 23rd 2018
    Ok thanks Tony
    • CommentAuthorjfb
    • CommentTimeJun 23rd 2018
    then again - they are cheap for what they do so why not put in a larger one.
    • CommentAuthortony
    • CommentTimeJun 23rd 2018
    • CommentAuthormikael
    • CommentTimeJul 2nd 2018 edited
    The sustainability argument for using a slightly smaller lintel is very weak in this case. Both lintels are carrying either bricks or blocks above them. If the lintel is slightly thicker it will just replace a small amount of concrete block or brick, both of which are very similar from a sustainability point of view.
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