From Longman Dictionary of Contemporary Englishlagginglag‧ging /ˈlæɡɪŋ/ noun [uncountable] British English DHspecial material used to protect a water pipe or container from heat or cold
Examples from the Corpus
lagging• The air smelt of lagging, paint, damp.• With one other lagging behind ... That's what the Imperial Fists would be seeing, staunch horror in their hearts.• Since aquaria will require supplemental heating the use of polystyrene lagging is very good in reducing heat loss.• A thick lagging jacket should be put on to the hot water tank.• The possibility of this latter sum of value lagging behind the growth of the volume of production in Dept. 