The Orchard girls, beaten senior finalists in 2006, produced an accomplished performance to leave Waterford reflecting on a second intermediate final defeat in three seasons.
At half-time, Armagh led 1-5 to 1-1 but had also amassed 13 wides.
Waterford opened the scoring through captain Michelle McGrath after 18 seconds but after hitting the front, Armagh were never caught.
With ten minutes on the watch, Caroline O’Hanlon’s free struck the Waterford upright but Armagh full-forward Shauna O’Hagan was on hand to pick up the pieces from close range.
That goal handed the Ulster champions a 1-0 to 0-1 lead but Waterford netted in the 12th minute when Hannah Landers took a pass from Linda Wall to finish superbly at the Hill 16 end.
Wall cut the gap back to three points with the opening score of the second half but Armagh were always in control and quickly raced 1-10 to 0-3 clear.
Waterford desperately went in search of goals but were denied time and again by Armagh custodian Catherine McAlinden who saved a Michelle Ryan penalty and the same player’s blistering drive a minute later.
Armagh went close to a second goal soon after as Kelly Mallon’s shot across the face of goal was narrowly missed by the inrushing Mags McAlinden.
Scorers for Armagh: S O’Hagan 1-1, C O’Hanlon 0-3f, M McAlinden 0-2f, F McKenna 0-2, N Henderson, M McGuinness, C Lennon & K Mallon 0-1 each.
Scorers for Waterford: H Landers 1-0, L Wall 0-2, M Ryan 0-2 (1f), M McGrath 0-1.
ARMAGH: C McAlinden; C McCann, L Brown, S Marley; S Reel, N Marley, N Henderson; S McCleary, C O’Hanlon; M McGuinness, M McAlinden, F McKenna; C Lennon, S O’Hagan, K Mallon.
Subs: S Mackle for McKenna (50), M Tennyson for Mallon (52), C O’Hare for Lennon (57), C Duffy for Henderson (57).
WATERFORD: A Jordan; A Landers, K McGrath, N Dunphy; R Tobin, G Enright, M Wall; M McGrath, E Power; L Wall, M Ryan, T Fitzgerald; A Wall, S Curran, H Landers.
Subs: E Fennell for Fitzgerald (24), M Revins for Landers (46), G Kenneally for Fennell (56).
Referee: P Kehoe (Carlow).