Lagging is special material which is used to cover pipes, water tanks, or the inside of a roof so that heat does not escape from them or so they do not freeze.
[mainly British]
lagging in British English
(ˈlæɡɪŋ)
noun
1.
insulating material wrapped around pipes, boilers, etc, or laid in a roof loft, to prevent loss of heat
2.
the act or process of applying lagging
3.
a wooden frame used to support an arch during construction
lagging in American English
(ˈlægɪŋ)
noun
1.
thermal insulation for wrapping around pipes, boilers, etc.
2.
a wood framework to support an arch while it is being built
3. Mining
planks or timber used to prevent rocks from falling in a shaft or drift
Word origin
< lag2 + -ing
Examples of 'lagging' in a sentence
lagging
I imagine I'm kinda lagging in the most up-to-date information, so maybe Arnie will brief me.