Calculate matching cut & off-cut sizes in concrete block walls with mitered corners - Halve your cutting!
From - To
Off-cut works 1/2 bond
Print and use the tables below to find optimal set out and cutting of mitered corners in concrete block walls.
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.
Str 3/4 Match
Mouse over entries for description - click for bond diagram.
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. Eg: 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' Radio Button. You can often open or tighten bond slightly to find a length that will match off-cuts both ends.
If you're cutting blocks, concrete, stone or ANYTHING and there's DUST - DON'T TAKE THE RISK
Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
How should we spell it?
What do we think? - They're 2 different things:
A Meter is a device to measure things - like a Volt Meter or a Parking Meter
A Metre is about 3'-3~3/8"
Although diameter and perimeter as measurements - don't seem to fit very well
If the US ever goes Metric, you'll be able to use a Meter to measure Meters - A Meter Meter
(And when we go back to the moon, let's go Metric, ay?)
All Inch (Imperial) inputs and dimensions are actual physical finished sizes(unless otherwise noted)
All Metric Inputs in Millimetres(unless otherwise noted)