The table should be used as a guide only and does not apply to specialist tapes e.g. wave tapes.&nbsp;
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Source: The Encyclopaedia of Curtains by Merrick and Day. Purchase your copy <a href="https://www.merrick-day.com/acatalog/The-Encyclopaedia-of-Curtains---A-Complete-Curtain-Maker-EOCMD.html#SID=13" target="_blank"><ins>HERE</ins></a>

The table should be used as a guide only and does not apply to specialist tapes e.g. wave tapes. 
 
Source: The Encyclopaedia of Curtains by Merrick and Day. Purchase your copy HERE

Curtain Heading Fullness Guide