Tries from man-of-the-match Manoa Vosawai and Tom James fired the home side into the lead.
And a superb late defensive show kept the Irish side at bay to see Cardiff Blues record a second league win of the season.
“I pleased to see such a big effort from the players to defeat the league leaders at home,” he said.
“We talked about improving our home record and this is only our third home league game and people forget that.
“We need to build a home record and if we want to give ourselves a chance we need to win at home. We did that tonight and hopefully that will give us a springboard to build from.
“We stopped the best attack in the league and we defended for long periods really well.
“We had good line speed and when they went out the back to try and get around us we cut that off. We got caught once or twice, but we scrambled well.
“We’ve only conceded 16 points against the best attack in the league at the moment so we have got to be pleased by that.
“Credit goes to our defence coaches, Graham Steadman and Richard Hodges, that was another massive step in the right direction.
“I felt we had a good platform and worked extremely hard. When we did have patches of attack we showed what we can do and the major work on was our contact area. We got turned over a bit too easy.
“But the important factor today was getting the performance to get a positive result and we got that.”