Home  5  Books  5  GBEzine  5  News  5  HelpDesk  5  Register  5  GreenBuilding.co.uk
Not signed in (Sign In)

Categories



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!


powered by Surfing Waves




Vanilla 1.0.3 is a product of Lussumo. More Information: Documentation, Community Support.

Welcome to new Forum Visitors
Join the forum now and benefit from discussions with thousands of other green building fans and discounts on Green Building Press publications: Apply now.




    • CommentAuthorPord
    • CommentTimeAug 14th 2019
     
    We're soon to put the sheet metal roof on our new build. Is plastisol worth the extra £2.50/m2? It's a tight-budget self-funded build so am always looking for savings.

    Plus, we'll be harvesting the rainwater for all our needs, including drinking. I've read some online health concerns about plastisol inks.

    Any thoughts?
    • CommentAuthortony
    • CommentTimeAug 14th 2019
     
    I like coloured but I’d does not need to be plastisol.
  1.  
    Posted By: PordPlus, we'll be harvesting the rainwater for all our needs, including drinking. I've read some online health concerns about plastisol inks.

    What plans to filter and purify the rainwater to drinking water quality?
  2.  
    At both our last houses we inherited outbuildings with corrugated and 1000 profile roofs at about 20deg slope. The painted galvanized wavy stuff has lasted 40+ years in many places, but leaves and moss have collected in some places, particular ly in the corners of the square profile stuff and near the gutters. Where this has happened the resulting leaf mould has held moisture against the metal and quickly rusted through, the water then damaged everything underneath.

    Maybe focus on how you will keep the roof clean (especially if you are thinking of drinking off it !!) And on the relative cost of the roofing sheets vs the cost of repairs when they fail.

    Interested if anyone has good experience with GRP or polymer profile roofs?
    • CommentAuthorPord
    • CommentTimeAug 16th 2019
     
    Peter - standard filter and UV system

    Will - thanks. Our pitch is 34deg so most leaves and other debris will prob wash off with rain. We'll only know once it's all installed, though.
    •  
      CommentAuthordjh
    • CommentTimeAug 16th 2019
     
    https://www.cat.org.uk/info-resources/free-information-service/water-and-sanitation/rain-and-grey-water/

    "In the UK, treating rainwater to a high standard for bathing or drinking is not recommended. Besides the expense, the impact of all the equipment needed outweighs the environmental benefits of reducing mains water use. Small-scale water treatment systems use lots of energy in manufacture and use, and the filters need to be regularly replaced, creating waste."

    https://www.uk-water-filters.co.uk/special-uses/rainwater_harvesting.html

    "Drinking harvested rainwater is not approved of in the UK.

    "This is mainly because bacteria is almost guaranteed to be in harvested rainwater. A simple image of birds sitting on your roof should help explain this...

    "While it is certainly possible to fully filter this rainwater using Ultra Violet systems, the fear is that whereas UV filtration is used happily on “non mains” supplied water from boreholes or well water, these sources tend to be fairly clean to start with.

    "The Ultra Violet filtration of this water is used as an extra precaution - “just in case” any bugs are in the usually clean water.

    "However, rainwater that's come off a roof is practically guaranteed to have bugs.

    "The fear is that the Ultra Violet filter systems won't be maintained properly and, to be blunt, that people will die.

    "To counter this you simply need to make sure you have: ..."
    • CommentAuthorJeff B
    • CommentTimeAug 16th 2019
     
    Just realised I missed seeing the important words..."including drinking". I think I would be much more worried about lots of other potential contaminants (of biological origin) rather than Plastisol inks!

    I had a Plastisol coated steel profile roof on the garage of my previous house. It was very good and needed no maintenance. I did put a coat of black car underseal along the drip edge of the sheet to prevent the edge rusting. However in my case the water from the gutter went straight to the drain.
    • CommentAuthorPord
    • CommentTimeAug 17th 2019
     
    Thanks Jeff.

    Pete, I'm just looking for input on the plastisol roof coating.
  3.  
    Posted By: djh

    "This is mainly because bacteria is almost guaranteed to be in harvested rainwater. A simple image of birds sitting on your roof should help explain this...

    "While it is certainly possible to fully filter this rainwater using Ultra Violet systems, the fear is that whereas UV filtration is used happily on “non mains” supplied water from boreholes or well water, these sources tend to be fairly clean to start with.

    "The Ultra Violet filtration of this water is used as an extra precaution - “just in case” any bugs are in the usually clean water.

    "However, rainwater that's come off a roof is practically guaranteed to have bugs.

    "The fear is that the Ultra Violet filter systems won't be maintained properly and, to be blunt, that people will die.

    "To counter this you simply need to make sure you have: ..."


    That's hyperbole from an advertisement, selectively quoted. Here's some more of the quote:

    "To counter this you simply need to make sure you have:

    "a) a good quality Ultra violet water filter system - make sure it is a top quality brand sold by a known and reputable business (hint hint)."

    "b) That you change the bulb every year on time"

    "c) That you change the pre-filters regularly."

    "All of this is easily done. "


    The public water supply runs off hillsides with plants and livestock on them, via rivers past sewage works, and reservoirs with plants birds and fish living in them. The water company filter and sterilise it.

    Many of us who do not live near a mains water connection, have to do this ourselves, with readily available equipment. To be blunt, people don't die.
    • CommentAuthorCWatters
    • CommentTimeAug 17th 2019
     
    I remember reading somewhere that the longevity of sheet metal roofs depends a lot on how carefully they are handled on site. Eg avoid scratches by rough handling.
    • CommentAuthorCWatters
    • CommentTimeAug 17th 2019 edited
     
    If its any help Google found mention of a list of approved coatings for rainwater harvesting in the USA..

    https://www.bluebarrelsystems.com/blog/roofing-materials-for-rainwater-harvesting/

    Refers to the list here..

    http://info.nsf.org/Certified/Protocols/Listings.asp?TradeName=&Standard=P151
    • CommentAuthorPord
    • CommentTimeAug 21st 2019
     
    Thanks chaps. I'm going to ask the supplier for tech spec relating to the toxicity of plastisol. It's fairly certain, though, that budget will dictate we opt for the standard finish (and focus on maintaining the integrity during installation).
Add your comments

    Username Password
  • Format comments as
 
   
The Ecobuilding Buzz
Site Map    |   Home    |   View Cart    |   Pressroom   |   Business   |   Links   
Logout    

© Green Building Press