Recent content by RonnyRaygun

  1. RonnyRaygun

    Thermalite blocks for external skin?

    Thermalite have scratch marks and Celcon have a coloured band on the ends. There are others too such as Durox and Y-tong.
  2. RonnyRaygun

    Thermalite blocks for external skin?

    See Woody's post above - there is more risk of cracking due to the thermal effects. However, it's a cosmetic issue, not a structural one - all of the load is taken by the inner leaf. The inclusion of EML and/or other fabric mesh will help to prevent cracking showing through into the render even...
  3. RonnyRaygun

    Thermalite blocks for external skin?

    I don't live at the same property any more, but when I left in 2016 it was still fine. In the end I also used EML fixed to the blocks to help with the bonding. It's not common to use aircrete for external walls - there might be other methods of rendering onto them with alternatives to sand and...
  4. RonnyRaygun

    steel beam bowing

    Yes, but that assumes joists built in and from both sides of the beam. In this case the joists are only from one side and likely to be above the beam, not at the same level as it. The same paper says that reliance on friction isn't recommended, so it would be imperative to provide sufficient...
  5. RonnyRaygun

    steel beam bowing

    As I suspected... He's taken full lateral restraint and taken live load deflection only Put him back on photocopying duties until he learns what he's doing :LOL:
  6. RonnyRaygun

    steel beam bowing

    Buckling occurs because of compression in the top flange, not because of lateral loads. When the top flange reaches its compressive limit it'll buckle. I'd assume it'll buckle in the nominally weaker direction and more likely away from the applied load, not towards it.
  7. RonnyRaygun

    steel beam bowing

    You mean for a 254x102x22 UB? I took half of a 3.5m span (guess) at 0.80kN/m2 Dead and 0.75 Live (for the roof), and 0.9m of cavity wall, on a 7.5m span Based on that, the deflection of the 254x102x22 beam under dead and live load is 44,5mm. Live load deflection is within limits of span / 360...
  8. RonnyRaygun

    steel beam bowing

    No, three reasons (off the top of my head). 1: It's risky to use joists to prevent buckling as it relies on them being cut perfectly and tight to the beam. 2: Usual for the joists to bear above the beam when used as a lintel so don't provide any restraint. 3: The joists would only be coming in...
  9. RonnyRaygun

    steel beam bowing

    Never ever use a 254x102 UB as a lintel above a doorway. They are useless unless restrained as they are too slender and will buckle long before they reach their full bending resistance. A 254x102 simply isn't sufficient for the span (my quick check indicates a 254x146x43 as an absolute...
  10. RonnyRaygun

    Possible subsidence?

    Yes, and you would expect the vendor to have some crack monitoring records and reports that they could pass onto the OP. There would potentially be recommendations of work to be carried out (such as pollarding or removal of trees). If there is a report that states that mitigating work has been...
  11. RonnyRaygun

    Possible subsidence?

    Need photos of the whole elevations to have any idea
  12. RonnyRaygun

    Chimney breast previously removed

    Can you see anything from in the attic space? If a beam is installed (or gallows brackets) usually they are installed in the loft space so would be visible. I can't think how it wouldn't be possible to see the support if there is one. If the loft space is fully boarded it may be hiding...
  13. RonnyRaygun

    Chimney breast previously removed

    A structural engineer won't just tell you it needs looking at - they will be the ones doing the looking at. At the very least they will recommend that you have gallows brackets installed, but they depend on a number of factors and it's difficult to prove they work by calculation. The...
  14. RonnyRaygun

    RSJ Help

    The packers need to be either flexible (steel) or perfectly flat, otherwise the stresses induced will potentially cause them to crack (which is what seems to have happened in one place here) Ideally the packers should have at least the same compressive strength as the pad stone, but it would be...
  15. RonnyRaygun

    The Caravan Act, yeah right.

    Interesting one. Seems to me there wouldn’t have been any issues if they’d have just built what had been approved. Not really a mobile home is it? Not like the park homes you see dotted about the place. I doubt very much it was brought to site in two halves, craned into position, and bolted...
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