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.




    • CommentAuthorCerisy
    • CommentTimeDec 28th 2013
     
    A small dilemma - when we laid the foundations for our new build we used the left-over ready mix for the pad foundations for the posts that will hold up the porch type roof on the south elevation. Concentrating on getting the main foundations spot on for the timber frame erectors meant that these four concrete bases aren't exactly at the right level - amateurs eh!! One is 165mm too low (which is not too bad as I can fit some timber shuttering and add some more concrete), but the other three are 31mm, 61mm and 78mm too low. The posts are fixed to metal shoes that are bolted to the foundations.

    Any suggestions on how I can raise the levels of the pad foundations and maintain a decent fixing for the bolts? I'm using resin anchors and can, I guess, simply increase the length of the bolts - but I wondered if anyone had encountered a similar problem?

    Many thanks, regards, Jonathan
    • CommentAuthordaserra
    • CommentTimeDec 28th 2013
     
    Make some shuttering and fill up to the required level (try using water in a transparent hose to transfer height markers from place to place.)
  1.  
    To make a concrete that is solid whilst applied as a thin layer (31, 61, 78mm) use a dry mix of concrete. Just wet enough that it makes a ball when clenched in the fist, use rough sand.

    Make shuttering out of timber and make sure to compact the concrete mix (like making a cheese cake base)
  2.  
    Definitely go with longer bolts, you can use a special resin to cold bond the new cement to the old. Brush on to the old cement and immediately fill the former with the new wet cement. I have used Ecodrip by Mapie and it is fab. I have not had much success with 'dry cement' and use high strength wet cement with a good mix of particle size and vibration (hit the wood gently with a hammer!). If the pad is big enough I would drill very short large diameter holes in the surface of the existing cement to lock it into place.
    • CommentAuthorCerisy
    • CommentTimeDec 29th 2013
     
    Thanks guys - I'll check out the longer bolt option, drill some holes into the existing founds to lock the extra concrete in place and look into availability of the resin.

    Another "minor" issue sorted!
    • CommentAuthorGotanewlife
    • CommentTimeDec 29th 2013 edited
     
    Ooops not ecodrip, it is epodrip! FYI here:

    http://www.mapei.com/public/COM/products/366_eporip_gb.pdf

    and it says its bond strength is greater than the concrete...
    • CommentAuthorCWatters
    • CommentTimeDec 30th 2013 edited
     
    Are they wooden posts? If so are the bases above ground level to prevent rot? If not perhaps look at building brick bases. Our architect specified brick bases with lead flashing on top and a 20mm stainless steel pin to stop the post moving or being knocked off the base. I don't have a photo to hand but found this on the web which looks similar..

    http://www.taylor-lane.co.uk/assets/P1010244.jpg

    It looks like they used rather large lead flashing or coloured bricks for the top. We used the same colour and our flashing is a lot smaller - extends only about 0.5 inch down the sloping top.
    • CommentAuthorCerisy
    • CommentTimeDec 30th 2013
     
    Yes they are timber, but they are on galvanised steel shoes that will keep them above ground level.
  3.  
    '' they are on galvanised steel shoes that will keep them above ground level.''

    Not the type I have come across which hold water and keep the post-bottom in a 'pond', I hope!!
Add your comments

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

© Green Building Press