thatch, cover, shingle, tile
葺 centers on covering a roof with layered material: thatching, shingling, or tiling. The broader sense of covering something with a protective layer follows naturally.
葺 combines 艹 (grass) with 咠, which likely contributes the sound and relates to layering or attaching. The character originally referred to thatching a roof with grass or reeds.
The grass top 艹 sits over 咠 (mouth 口 above ear 耳), like layers of thatch or shingles being laid down over a roof frame. Picture a roof being covered piece by piece.
For シュウ, imagine a thatched roof being repaired after a storm: you shout "shoo!" at the birds trying to nest in the loose thatch. The "shoo" sound cues シュウ while the roof gets covered.
roofing; roofed with; thatching; thatched with; shingling; shingled with
thatching a roof (with grass); thatched roof
tile-roofing
reroofing; rethatching
shingling; shingled roof
slate roof
built-up roofing
temporary roofing
to thatch (a roof)
shingling with thin cedar or cypress shingles; roof shingled in such a manner (usu. at temples, shrines, etc.)
shingle roofing
shingling using thick roof shingles; roof shingled in such a manner (usu. shrine buildings, noh stages, etc.)
cypress bark roof; hinoki bark thatching
tiles used to cover nail holes in cypress bark roofing for the purpose of waterproofing
thatched roof
thatching; thatch; thatched roof
to reroof; to rethatch; to retile
shingles
to roof (a house with some material); to thatch; to shingle; to tile
round boulders covering the slopes of a burial mound (Kofun period)