Raker
Use Raker to build raking gable walls, by marking and cutting all the blocks first,
matching all off-cuts. You can fine tune the rake to optimize off-cut
matching by slightly altering the overall height of the gable,
making more offcuts match more accurately. Raker uses length, angle/height,
bond beam and type measurements to generate a cut sheet, listing all the cuts
in the gable and their off-cut matches. Use the sheet to mark the blocks,
numbering the cut and its' off-cut. Cut all the blocks first, then lay
them by number.
If the high end of the rake is to high to build a corner for
the gable line, do not erect a profile for the line. It's more accurate
to lay the blocks without a line, keeping to bond and gage, than using a
profile, which is difficult to erect accurately, and gets in the way.
Raker will compare all cuts and off-cuts, to find matches. This can save up to half
your cutting. You can choose acceptable off-cut matching tolerances in the
Settings menu. The greater the acceptable off-cut tolerance, the more matches
your likely to get. The default setting for 200 series blocks is + 5 and - 12.
This means 'If an off-cut is between 5 mm too high and 12 mm too low, it'll do.
It's easy to 'bog up' a 12 mm low block with mortar, but if you're any more
than about 5 mm high, its difficult to 'grind down'. For face work, choose
smaller matching tolerances. For rendered work, choose larger tolerances,
especially on the minus side.( Its easy to bog up). On the cut sheet, the cuts
and off-cuts are listed, with the off-cut match variation (how closely it
matches), in smaller text, next to the offcut.
Usually, gables start at a
point higher than the top of the wall they are on, often to make up for the
extra height of a truss. The Jackup , is the extra height above the
wall. The rake is effectively 'Jacked up'. For a Corner up gable, Jackup
is above the end of the wall.
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