1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Cavity wall & insulation (extension)

Discussion in 'Building' started by sambotc, 24 Oct 2016.

  1. sambotc

    sambotc

    Joined:
    10 Apr 2007
    Messages:
    646
    Thanks Received:
    14
    Country:
    United Kingdom
    So, the garden currently looks like the Somme. Managed to get a 3/4 tonne digger in over the weekend and if it wasn't for the massive lump of concrete found underground, everything would have gone fairly smoothly!

    Anyway, I need to shutter off the crater that's left and I've seen some people mentioning 150mm cavity with full fill Rockwool or similar?

    I have dug the majority of the footings 600mm so I was intending on 100mm block, 100mm cavity, 50mm partial fill celotex (or similar) and either 100mm internal block or thermalite? Could I go 75mm batts and have a 25mm air gap still?

    Is there a nack to thermalite as they seem to draw in the moisture quicker and move about a bit, puts me off using them a bit but I'm guessing they will be needed to keep the U value down with partial fill?

    Appreciate what views others have on the best way to go? Prefer to avoid the 150mm cavity if I can as the ground is a nightmare to dig and it would mean trimming up the trenches to widen the footings in places!

    Thanks in advance

    Sam
     
  2. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  3. Sponsored Links
Loading...

Share This Page