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

Insulation Options to reduce thickness

Discussion in 'Floors, Stairs and Lofts' started by LeeWoods, 1 Sep 2016.

  1. LeeWoods

    LeeWoods

    Joined:
    1 Sep 2016
    Messages:
    4
    Thanks Received:
    0
    Country:
    United Kingdom
    This is my first post...take it easy on me.

    We are about 30% into our build and up to ground floor level above basement. There has been discussion between Architect, Builder and Structural Engineer over the concrete beams that have been used which are 220mm as opposed to 150mm initially specified. We are spanning 4.9 metres which is over the upper limits of 150mm beams. The manufacturer, rightly so it seems, upped the thickness. Therefore we're about 75mm lower in our ceilings. What options do we have outside of traditional 100mm insulation to compensate for that height loss...out builder mentioned some alternative insulations which are very expensive. Does anyone have any insights as to what those products might be and/or other alternatives to 100mm insulation.
     
  2. Sponsored Links
  3. motorbiking

    motorbiking

    Joined:
    31 May 2016
    Messages:
    6,075
    Thanks Received:
    692
    Country:
    United Kingdom
    The beams can be clad with conventional insulation or boards. I'm assuming its an "I" beam? It depends on the external finish to some degree as you may not be able to clad both sides. It shouldn't cost a lot though.

    I cut celotex to fit my I beams which from memory where slightly bigger than yours. I oversized the panels a few mm, which mean the could would hold tight when tapped into position. I'm not convinced it makes a huge difference however, as metal conducts very differently, but it was a low cost better than nothing option.

    You are supposed to clad the whole beam to address this, but I didn't bother as it wasn't practical.

    [​IMG]

    I'd check that services aren't impacted in the design change as things like bathroom/toilet waste pipes can become complex .

    If the beams are bridging an external wall which is to become internal as a result, then I wouldn't bother insulating at all
     
    Last edited: 1 Sep 2016
  4. geraldthehamster

    geraldthehamster

    Joined:
    7 Feb 2010
    Messages:
    2,974
    Thanks Received:
    320
    Country:
    United Kingdom
    I think the OP is referring to a concrete beam and block floor...
     
  5. freddiemercurystwin

    freddiemercurystwin

    Joined:
    21 Jan 2007
    Messages:
    19,059
    Thanks Received:
    2,119
    Location:
    Devon
    Country:
    United Kingdom
    The OP's first post is not clear, is this the floor between the basement and ground floor or what? Is this the insulation going at the basement floor level and the beams are at ground level? Some clarity please OP .......
     
  6. motorbiking

    motorbiking

    Joined:
    31 May 2016
    Messages:
    6,075
    Thanks Received:
    692
    Country:
    United Kingdom
    sorry - he does say concrete beams and not I beams... I'll get my coat.
     
  7. endecotp

    endecotp

    Joined:
    2 Dec 2013
    Messages:
    3,935
    Thanks Received:
    507
    Country:
    United Kingdom
    In the basement or the ground floor? I.e. has the extra beam thickness been taken from the basement ceiling or the ground floor floor?

    Probably spacetherm / aerogel, or maybe vacuum insulation panels. Google can find details. Both are very expensive, and probably not a realistic option.
     
  8. 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

     
  9. Sponsored Links
Loading...

Share This Page