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Build concrete filled masonry block arches without using a template



An arch has 2 identical sets of cuts
(left and right sides). A bulls-eye (circle) has 4.

Scale
How it works When the wall is core filled, the membrane (flashing) around the arch line stops the concrete. Remove off-cuts and extra blocks to reveal the arch.

Width
Height
Remove off-cuts after core fill to reveal arch Cut all the blocks before construction. The cut blocks (all halves) that form the arch are numbered sequentially, with off-cuts numbered identically. Take the opening to spring height, then using a standard horizontal head support, go across the head, laying each cut in its place, its matching off-cut on top, with a membrane (aluminium flashing is ideal) between the two. Lay the cut, place the flashing on top of the cut line and lay the off-cut to lock membrane in place.
Use overlapping lengths of thick, strong aluminium flashing about 1 metre long so the flashing doesn't get in your way.





Circular Raking Walls with Arch or Bullseye You can combine this Templateless Arch System with the Circular Wall System to easily build curved or circular (and raking) walls with arches or bulls-eyes. It's easy! If you'd like more detailed info on this, please contact me.



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Create PDF files to print diagrams on current page. Print large images over multiple pages Printing to Scale Help and Plan Printing.

Slider Controls To fine tune Slider Controls click to select and use (cursor) keyboard keys.

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Lay your device on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION.
All calculators on this site are GEOMETRIC only. Check local regulations for sizes, spacings and all engineering requirements.


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