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Vertical crack middle of window lintel

Discussion in 'Building' started by Stupida, 17 Oct 2019.

  1. Stupida

    Stupida

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    Removing plaster from wall and reveals in bedroom and noticed crack in lintel.

    The bungalow is a1960s build the lintel is concrete.

    will it be ok to leave?

    19D89068-DC14-4D65-9327-35BB817055DB.jpeg 4E4651D3-11B1-424A-94F9-9901FD198B87.jpeg 19D89068-DC14-4D65-9327-35BB817055DB.jpeg
     
  2. wwwebber

    wwwebber

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    Looks bowed to me - I would replace
     
  3. bobasd

    bobasd

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    As above.
    something caused it to bow and crack and that something will still be there.

    i prefer steel to stressed concrete.

    replacement Pvc window frames can be a cause, and fwiw the frame should be set back a min of 75mm from the face of the building.
     
  4. tony1851

    tony1851

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    I shouldn't be surprised if that beam was cracked from day one.
    Personally I wouldn't be bothered replacing it; it does't seem to carrying too much load, and the reinforcing wires will keep it together.

    (Note: if it's a Boot lintel (which goe through to the outer skin) the steel wires may be susceptible to damp and therefore rust-problems, in which case it probably should be replaced)
     
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  5. Stupida

    Stupida

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    Thanks,
    It doesn't extend to the brick exterior it just holds the wall plate up. I don't see much bowing, the plaster on the front wasn't cracked (so maybe from day one as you said) and the roof tiles that were replaced last year are a third lighter than the old ones so I think I will leave it.

    The window frame doesn't take any weight in fact the top of the window is in mid air in the soffit space.
     
  6. bobasd

    bobasd

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    OP, the idea is that we can only "see" whats in the pic - the pic shows a slight bow.
    whereas you, on site, "I dont see much bowing" need to offer a spirit level up.

    if the lintel was cracked by say crane dropping it into position then the crack would have been visible from day one until plastering took place - ie open to and during BCO's inspection.

    the frame in the pic could be a replacement frame thats been wrongly repositioned almost flush with the brick face.
    perhaps an original sturdy, solid wood frame with a mullion was originally supporting the lintel?
     
  7. catlad

    catlad

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    Correct.
    And if your at that level of refurbishment why wouldn't you replace it.
     
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  8. Stupida

    Stupida

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    It’s a time issue. Especially finding a builder at short notice to stick a steel in.
    Any recommendations in the Walsall area?
     
  9. Stupida

    Stupida

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    I have noticed there are some sort of rectangular inserts in the concrete lintel, maybe to fix the curtain tracks? One of the inserts is in the crack line.

    As a result I am not keen on ignoring the crack now and I am going to replace it.

    There’s no masonry above the lintel just the wooden wall plate and rafters bearing down on it.

    Am I ok to use a box lintel instead of a concrete one?
     
  10. bobasd

    bobasd

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    you could call Catnic tech dept with your pics and length of the existing conc lintel (probably about 10ft) and get a suitable replacement lintel.

    dont try and replace it on your own. professional help is best.
     
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  11. Stupida

    Stupida

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    Thank you.
    Getting someone is the hard part
     
  12. Stupida

    Stupida

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    I called Catnic technical. I found them to be very helpful. They asked a few questions and specified a heavy duty box lintel.
     
  13. Stupida

    Stupida

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    Unfortunately the Lintel Catnic recommended is 215mm high and I only have 190mm of headroom.

    I looked at replacing like for like but new pre-stressed lintels for 3000mm length come in at 215mm high also.

    Can anyone suggest what I should do?

    I am thinking worse case scenario is to use a extra heavy duty cavity lintel and replace the window to match the shorter gap?

    Any suggestions very welcome.
     
  14. bobasd

    bobasd

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    how come you didn't supply Catnic with full dimensions? you could go back to them?

    anyway, there's surely a steel lintel of some kind out there, for instance 178mm x 102mm or 152mm x 102/90 RSJs are available.
    a 178 RSJ will support 19kg/m.

    RSJ's will sag a bit over time but only a few mm's.
     
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  15. Stupida

    Stupida

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    Catnic original advised over the phone
    It was their email response that discussed the headroom.

    I am going to change the window next summer so I can lower the headroom and install a shorter window
     
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