Roofing

Do furrings cause leaking long term?

Anonymous user 03/03/2024 - 3.18 PM

Hi All, My builder has built the roof according to the achitects dimensions, but didn't check the pitch on the first rafter. The roof is now 13 degrees instead of the minimum 15 degrees for the 3x Velux windows. We have 2 options: 1) Spend money on reduced pitched Velux windows that stick up at the back to bring the Velux windows up to their minimum 15 degree pitch 2) Spend roughly the same amount (apparently) ripping up the existing felt and battons, laying the furrings which will be an extra 100mm higher at their thickest point (furrings will be going from 0-100mm over 2.7m) The roofer is saying #1 is much better as he says as rooves expand and contract with summer/winter, the furrings and related lead flashing will move and the roof will leak in 5 or 6 years. I would rather have option #2 as I think having the Velux's stuck up 100mm higher at one end rather than other will look odd, but would like to get a 2nd, 3rd or as many other roofers opinions on what our roofer is saying as if he is correct re the longevitiy of #2 then so be it. Many thanks for your time.