A reader's Roofs and roofing question: Corrugated iron join?

Howard L.   from   Warrnambool. Australia   had this Corrugated iron join question.

How do you join corrugated iron (orb)when two angles are involved as in an Australian Barn design? The apex angle is 22.5 deg. joining to the lean to at 12 degrees. At what distances do you place the corresponding purlins?
flashing under method
Corrugated iron join - Method using a flashing under the joint.
bending the iron
Corrugated iron join - Method of bending the iron.

Bill's reply

Hi Howard,
  • first method is to use a flashing, I have shown a steel purlin here, but quite often there is a timber fascia.
  • Some people just turn up the pans of the lower sheets, then push them under as far as they can. Which is not much if there is still a fascia there.
  • The best way is to drop the lower roof a few inches and have a vertical section to the flashing, but I still undo the bottom row of screws and put the flashing on top of the batten.
  • Note! This is the best method for deeper profile roof sheeting. The bending method below only works with corrugated iron.
  • My preferred method is to to it like the bottom sketch.
  • If the job is adding the lower pitched roof to a n existing roof then sometimes unscrewing a couple of rows of fixings on the top roof is needed to lift the sheets enough to get the new ones under.
  • If the whole roof is new then this is the way to go.
  • Put the lower rows of screws in first and the ones going through both sheets last.
Cheers Bill.

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