Window Sill - unwanted block under sill


RobWhite
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as per the attached window sill in a brick cavity wall I have created an unwanted block

I have created a 1course splayed sill as per displayed in the library below, but for some reason chief is created a mould of about 25x25 (1"x1") additional moulding as the base of my sill which creates an unslightly gap below this sill. 

I have made sure the rough openings are set and zone

The bottom sill thickness is set at 86mm (i.e. I course)

Any suggestions or helps.

 

image.thumb.png.48d20ff323b6f72d425575f31fb30169.png

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