lean-to roof, non-parallel wall, slope eves or abutment?

[RobertL]

I have a lean-to which I want to re-roof. The exterior wall is not
parallel to the house wall which means that either the abutment or the
eves must slope if the roof is to be monopitch. It is narrow (about
0.7-1.4m) and about 4m long. No gutter is needed.

The convention seems to be that the slope is taken at the abutment
with the eves kept horizontal. However, it would help with the
headroom to be able to slope the eves and have the abutment
horizontal.

As I will have no gutter could I slope the eves or is there a good
reason not to? one thought is that the rafters will not be
perpendicular to the (sloping) wall plate at the eves if i do this.

many thanks for any comments,

Robert



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[harry]

The alternative is for the roof to vary in it's pitch (steepness)
Depends on your roofing material whether this is possible.
ie become less steep as the roofed in area becomes wider, a twist in
the roof.

[RobertL]

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That is a thought. it will have rafters w/ plasterboard under,
then18mm plywood above, then 120mm solid insulation above that, then
roofing felt on top.

the problem is likely to be that the ceiling plasterboard would also
have to curve.

Robert

[harry]

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Can be done. Just leave plasterboard on the floor with a brick under
one corner for a while. If the twist is too pronounced it looks a bit
odd. But most people never look.
The ply will twist easy.
The alternative is to have a non level wall. Definately looks odd with
a non level "ridge"/high end