I'd replace the stack if it was a south-facing wall and in the summer. Did one last year and I got more of a tan than a week in Ibiza!!
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They do a support collar if your worried but i think you would be fine its how i would do it cast tee then black 110mm out the branch , no.way i would take the stack down . kop
Speaking from experience i would use the timersaver anything else wont look right Fernco no i wouldnt, 100mm will fit its measured internal just get the right collars a days work , changing the stack a weeks work a tower needed in poor weather no way £1000 at least you know it makes sense get the timesaver . kop
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