These are relatively weak as the gluing area is halved (140:8), and they are, therefore, confined to light frames where the strain is negligible or where the edges are moulded and must show a mitre. Sash-bar halvings (140:9) are part cross halvings and part mitre halvings. The square recesses are cut first and the mitres after, using a mitre template for final trimming.
All halvings are glued, some can be screwed for additional strength, as shrinkage is bound to occur across the width, with rupturing of the glue-lines if the sections are wide.
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