Plasterboard That Covers the Sides of a Room
Puzzle 8 of Home Improvement Easy Pack
Question is: Plasterboard That Covers the Sides of a Room
and the answer is: DRYWALL
Word Meaning:
DRYWALL — A building material comprising a sheet of gypsum sandwiched between two pieces of heavy paper, used mainly for interior walls and ceilings.
Definitions from Wiktionary.