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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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    • CommentAuthorsalvador
    • CommentTimeSep 1st 2019

    I'm looking at some architectural sliders from various suppliers such as Ultraline, Express Bi Fold, Cor-Vision etc. I noticed that on Ultraline, it "only" gets a Class 2 for air permeability whereas others achieve a Class 4. I'm aiming to get as air tight as possible and I'm trying to figure out if a Class 2 is poor and will cause problems, or if it's only relevant for very windy exposed locations. I can't seem to find any guidance on what these numbers mean real life.

    I really like the Ultraline, but I'd hate to be sat next to a draft having spent so much on windows.

    Incidentally, has anyone reviewed such suppliers before for price to quality comparison?

    All and any advice welcome.

    Many Thanks!
    • CommentTimeSep 1st 2019
    Don't know any of the brands you mention. But if one gets class 2 and the others get class 4 I'd be tempted to go for one of the others. It's not just the performance when new you need to consider, but how it performs after a few years. Usually people consider the number of seals a product has.
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