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Which First ? New Cut Roof...

Discussion in 'Roofing and Guttering' started by paulandfrodo, 15 Jul 2016.

  1. paulandfrodo

    paulandfrodo

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    Hi,

    I've got a building being refurbished. We have a 40 ft roof that we need to cut and put on. At the mid point (ish) of the rafter we will be putting steel perlins in to support the load.

    At the two gable ends we have already placed the padstones (a little lower than we think we need) and have cut our template rafters.

    Now, we can cut the whole roof and birds mouth where the steels (with timber plate ontop) will sit and hold the roof up. Then slide the steels underneath and cut the vertical posts holding these steels and then weld in place.

    Or should we put the steels in and then put the rafters ontop ?

    Our problem is that we have no accurate way of ensuring these steels follow the natural flow of the roof line (building) as it does dip down, by about 1" over the 40 ft. So, by doing steels second, we can crank the steels up to the underside of the rafters and then shuffle the top plate that the bottom of the rafters sit on in an out a little, as the wall does wobble a little.

    Your comments would be appreciated.
     

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  3. noseall

    noseall

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    Like wot we done.....
     
  4. noseall

    noseall

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    We set our padders so that they were about 20mm low so that we could acrow the steels into the rafter b/m. Bear in mid though, that once you start lifting the beam off its seat then it will begin to wander. Make sure you have measures in place to mitigate this.
     
  5. catlad

    catlad

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    How much sag in the middle did your little beams have Nose :whistle:
     
  6. vinn

    vinn

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    OP,
    the semi-dropped chimney stack in photo 1. needs work before the finished roofing is fixed.
    Given all the work going into this renovation perhaps re-build a traditional stack?
    Whatever, the air brick and the flag have to go.
     
  7. paulandfrodo

    paulandfrodo

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    noseall,

    What "measures" are usually used to stop the wobble ? Is it just some timber screwed to the floor from one of the rafters, that will allow the steel to "lean" against ?

    Paul.

    We have two times three horz steels with four vertical steels to hold these up with...
     

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  8. paulandfrodo

    paulandfrodo

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    Please don't say measures includes crossing your fingers !
     
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  10. vinn

    vinn

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    "Be nice. Nice things happen !"

    OP, I'll tell you what would be nice - if you at least acknowledged all who post suggestions in your thread?
     
  11. noseall

    noseall

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    I had the lads steady the beam manually whilst we had packers at the ready to jamb under the beam and a guy ready to wind down the acrow back onto the seat. You just need to be aware and diligent.
     
  12. noseall

    noseall

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    I reckon the recent hot weather has actually caused it to bow upwards. :sneaky:
     
  13. catlad

    catlad

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    I had a siesta for a couple of hours today. scorchio!
     
  14. paulandfrodo

    paulandfrodo

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    Roof cut. Steel onsite, we will cut and fit on Monday.
     

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  15. paulandfrodo

    paulandfrodo

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    Steels in, Starting to stud out. In the end not so worrying. But thanks for everyone's advise.
     

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