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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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    • CommentAuthorJeff B
    • CommentTimeMay 25th 2020
     
    Nick - yes, it is bizarre that the photo came out upside down, perfectly illustrating how to use the gun!

    You are right about the difficulty of using the gun when trying to apply foam from below, this is exactly what I have found. The can is so tall that I could not get into the space between the joists without using the flexible plastic extension pipe. This wasn't helped by the fact that the attic is already boarded out and fibreglass quilt in place. I had to remove the boards nearest the dwarf wall right along both sides of the attic and roll back the insulation out of the way - quite a job all in all! Hope it will be worth it.

    I also have the same problem trying to fill any gaps at the top of the existing Celotex sheets behind the dwarf walls, as the can hits the underside of the sloping roof. I have had to use acrylic mastic or decorators caulk here.

    Another thing I have discovered is that it is best to ensure that the Celotex blocks are quite a loose fit between the joists to start with, otherwise the foam has nowhere to go and it makes a bit of a mess. I have a tendency to measure and cut too precisely!
    • CommentAuthorSteveZ
    • CommentTimeJun 10th 2020
     
    Thanks for the comments on the benefits of a foam gun. I hate the one shot aerosol cans - never need it all and the next time you need some, it won't work. Just bought the cheapest foam gun on eBay. Seems well made and pretty sturdy.

    Bought the Screwfix No Nonsense own brand foam and in the instructions (Yes - I actually read them for a change) they recommend leaving the can on, rather than trying to clean the gun between uses.

    I have used it to fix the sandstone slabs around the liner of my new wildlife pond (lock-down project) and so far it seems to be a good method. The gun lets you put foam where you want it, once you get the correct adjustment on the trigger. It worked fine after leaving the gun overnight with no more than a cursory clean at the brass nozzle end.

    There are a few insecure stones on a small wall in the garden, so I'm going to see if foam is as good as mortar as a repair material.:bigsmile:
    • CommentAuthorJeff B
    • CommentTimeJun 11th 2020
     
    Well done Steve. Yes, probably one of the most useful tools I have ever bought. Leaving the foam can in place is definitely the way to go, not least because you use far less cleaning solvent as a result. Bond-It do something called Megastick which seems to be a hybrid of expanding foam and adhesive, which I have used as well. It is incredibly sticky stuff which might be better for holding masonry together! I've not tried it externally though.
  1.  
    Steve, you were luckier with your gun than me! I had always bought the Screwfix guns, but decided to get a cheaper one on-line (can't remember whose it was). It genuinely bent itself under the stress of depressing the can's valve. Absolute rubbish!!
    • CommentAuthorSteveZ
    • CommentTimeJun 11th 2020
     
    I obviously haven't hammered this like some of you professionals will, but here's the one I bought. It cost £8.99 so not a great saving over more recognised names.

    https://www.ebay.co.uk/itm/Heavy-Duty-Chrome-Metal-Expanding-Foam-Gun-Applicator-PU-Professional-Tool-NEW/362994976446?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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