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Build concrete filled masonry block arches without using a template

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.

Cut all the blocks before construction. The cuts (all halves) that form the arch and their off-cuts are numbered identically.
Width
Height


Take the opening to spring height, then using a standard head support, go across the head, laying each cut in its place, its off-cut on top, and a membrane (aluminum flashing is ideal) between the two. Use overlapping lengths of thick, strong aluminium flashing about 1 meter long so the flashing doesn't get in your way.
An arch has 2 identical sets of cuts (left and right sides). A bulls-eye (circle) has 4.
See also: Circular Paving Calculator for Custom Cut Stone Arches

Scale
Remove off-cuts and extra few blocks to reveal arch Remove off-cuts and extra few blocks to reveal bulls eye Round and curved top walls





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 (below).




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Use your iPad or Android Tablet On-Site Your iPad, iPhone or Android Tablet or Phone is a valuable On-Site tool!
Lay your phone or tablet on an angled surface (roof ?) to directly measure angles and automatically calculate Roofing and Pitch Angle Apps.

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Contact me - Greg Tarrant - Blocklayer.com Construction Software Online
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ALWAYS CHECK WITH YOUR LOCAL BUILDING AUTHORITY BEFORE LAYING OUT OR BUILDING ANYTHING
AND FOLLOW ALL LOCAL CODES. VERIFY ALL DIMENSIONS AND ANGLES BEFORE CONSTRUCTION


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