SWALEC Four South West opponents Vardre worked hard to get back into the game but a five pointer from Luke Thomas converted by Liam Garland, who also slotted over a penalty was not enough.
Vardre team manager Keith Jones said: "You could say that a few decisions went against us but in the end we were beaten by a better side on the day."
Senghenydd will meet Maesteg Quins at Millennium Stadium Finals Day after a nail-biting 31-30 victory over Four South East outfit Porth Quins at Taffs Well RFC.
Porth led 30-28 into the final minute when Gareth Lewis pounced to land a match-winning drop goal and send his side to the Millennium Stadium.
Lewis also converted a penalty try and landed six penalties for a personal tally of 23 points as Maesteg Quins of Four South West, extended their unbeaten record in all competitions.
SWALEC Bowl Semi-final results
Maesteg Quins 31 Porth Quins 30 (Taffs Well RFC)
Vardre 10 Senghenydd 34 (Maesteg RFC)
SWALEC Bowl Final to take place at Millennium Stadium at 1pm on Monday, 2 May (1pm).
Tickets for the SWALEC Finals Day are £10 for adults, £5 for Under 16s, OAPs and SWALEC customers*, available from Ticketmaster tel 08442 777888 and www.ticketmaster.co.uk, from the Cardiff Arms cafe/store, No 8 Westgate Street and from all participating clubs
*SWALEC customers can gain their discount code from swalec.co.uk/rugby