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PostPosted: Tue Feb 13, 2018 7:48 pm 
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Hi
I am building a small lean to extension, brick/block cavity wall and concrete tiled roof. Planning to have a traditional mortar bedded verge using fibre cement undercloak. I have two queries:

1. Should the undercloak be bedded on mortar appreciating it fits under the roof batten).
2. Should the outer brickwork be set circa 10mm lower than inner blockwork height (and therefore rafter top) to allow for the mortar bedding of the undercloak? Seems to me that this would be the only way to get the required outward/downward slope on the undercloak away from the face of the wall.

Any advice would be appreciated.

Thanks.
RVS


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PostPosted: Wed Feb 14, 2018 1:03 am 
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i would assume that your line for the 'raking cut' of both blockwork and brickwork would be set just few mm's down from
the rafter top allowing for a light mortar bed & the thickness of the undercloak.
The roofing laths then trap the undercloak material in position. Keep the ends of the laths cut back about an inch from the edge of the undercloak; the edge of the first tile (& tile and a half) start at this point and allow the morter pointing to cover the edge of the laths.

Davyp1


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