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Calculate matching cut & off-cut sizes in concrete block walls with mitered corners - Halve your cutting!
Off-cut works 1/2 bond |
For each Series (width) of Concrete Block, at any given miter cut angle, there is an optimal cut size, where the off-cut will fit next course, half bond.
These sizes are marked in blue for stretcher cuts, and Green for 3/4 blocks.
By cutting either a stretcher or 3/4, and using a 3/4 where necessary, you can often open or tighten bond to make all walls work with matching off-cuts.
Mouse over individual table entries (wall lengths) for a description of cuts, stretchers and fractions, to optimize cutting and off-cut re-use.
Click entries to draw a bond diagram (below table) Using these tables with correct cut sizes allows re using the offcuts (half bond next course). Save half your cutting and eliminate waste. |
Angle
| Angle | Series | Type |
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Setback
Difference in length front and back of a block to make the correct angle
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Stretcher Match
Cut a stretcher and the offcut (below) will go next course half bond
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3/4 Match
Cut a 3/4 and the offcut (below) will go next course half bond
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Str 3/4 Match
Cut a stretcher and use a 3/4 and the offcut (below) will go next course half bond
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Mouse over entries for description - click for bond diagram.
| Length | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
Click individual table entries to draw corresponding bond diagram.
For each Series (width) of Concrete Block, at any given miter cut angle, there is an optimal cut size, where the off-cut will fit next course, half bond.
These sizes are marked in blue for stretcher cuts, and Green for 3/4 blocks. By cutting either a stretcher or 3/4, and using a 3/4 where necessary, you can often open or tighten bond to make all walls work with matching off-cuts.
For a wall that goes from a miter cut corner to another miter cut corner, find the entry for the wall length in the table above. E.g. for a wall 2720mm long, mitered corner to mitered corner, find 2700 in the left column and go across to the 20 (top row) to find 5 350. This entry is in blue, so exactly matches a Stretcher-Match.
For a wall that goes from a miter cut corner to another miter cut corner, find the entry for the wall length in the table above. E.g. for a wall 2720mm long, mitered corner to mitered corner, find 2700 in the left column and go across to the 20 (top row) to find 5 350. This entry is in blue, so exactly matches a Stretcher-Match.
Start a Stretcher Match (cut 350 back to 240), then go 5 stretchers and the last cut is another Stretcher-Match. You've re-used all your off-cuts for Zero Waste, and HALVED YOUR CUTTING 
Always start with a Stretcher-Match, and try to find a length that suits a Stretcher-Match (blue) or a (green) ThreeQuarter-Match (a 3/4 cut instead of a stretcher) at the other end.
If the wall goes from a square end or corner to a Miter, select the 'Square to Angle' Button. You can often open or tighten bond slightly to find a length that will match off-cuts both ends.
Always start with a Stretcher-Match, and try to find a length that suits a Stretcher-Match (blue) or a (green) ThreeQuarter-Match (a 3/4 cut instead of a stretcher) at the other end.
If the wall goes from a square end or corner to a Miter, select the 'Square to Angle' Button. You can often open or tighten bond slightly to find a length that will match off-cuts both ends.
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Adjust scale of diagrams to measure 100% scale on screen with a ruler.
If you need to take full scale measurements directly from your monitor, adjust the size of the diagrams on screen to match a ruler. Does not affect printed sizes. Use keyboard Cursor Keys to fine tune as you adjust scale.
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