laggingsäie

I want to help, but “laggingsäie” does not appear to be a widely recognized term in standard reference sources. Could you please specify the intended domain or context (for example, textiles, botany, pipe insulation/lagging, or a historical term) and confirm the spelling? If you can share a source or describe what it refers to, I can draft a concise, neutral wiki-style article (under 300 words) tailored to that context.