Setting Gauge with different rafter lengths

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Hi Guys,

Haven't needed to call on your services for a long time but would like some advice please...

I'm currently replacing a lean to roof on the back of my house. The roof size is approx 6m wide by 2m long. Pitch is 35 degrees. My issue started when I began cutting the rafters in and realised pretty quickly that the 2 ends of the house were out of square. This mean I couldn't use my first rafter as a template for all the others. This wasn't a problem in itself (the weathers been more of a problem!) but now Im faced with the rafter lengths at eaves level being out by about +/- 40mm.

My question is; before I put my final cuts across the ends of the rafters and begin setting out the gauge for the tiles, what is the best way of compensating this difference? Should I follow the line of the original house at eaves level and live with my soffit running out by 40mm to make the tiles look right, or should I use the same measurement off either end and hope the tiles don't end up looking too bad! I've also got 2 veluxs going in so obviously I'm keen to keep the horizontal lines looking good.

Tiles are Marley Ludlow Major by the way.

Sorry for the long post and thanks in advance for any advice!
 
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I cant quite follow what you've posted. However, if the common rafter tails are running wild and long then cut and fix as normal - the 40mm can be lost in the battens and at the verges.

Tack on some practice battens with a few tile to find a method of compensating.
 
Thanks for the quick reply ree. I thought it might sound a bit confusing, its confused me enough!
Yep basically if all the tails of the rafters were cut parallel to the house the rafters at one end would be 40mm longer than at the other. So it seems this isnt the end of the world? Just cut parallel and gauge as per normal? I was just worried the veluxs would look on the slant!
I thought maybe the flashing at the abutment could be "adjusted" to hide the run out possibly....?
Cheers
 
Have the soffit square and fascia parallel. Then lose the 40mm by adjusting the tile batten gauge at each end of the roof. It will not be noticeable.
 
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Thanks woody. Sorry to sound a bit dim but when you say adjust the gauge is it better to just do the 40mm in one hit, say on the first/second batten and go up from there or gradually say over 4 or 5 battens? Cheers
 
Thanks a lot for all your replies. Seems that it might not be the end of the world after all. It'll be membrane and gauging day tomorrow so hopefully the weather cheers up! I will report back when ive got something resembling a tiled roof!
 
Do your gauging with a flicked chalk line. Else you will end up with wobbly tile battens because you are reducing the deficit as you travel down the batten. Difficult to gauge with a tape.
 

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