It was far from a straight forward victory however with a combination of a mid-game deluge of rain and a spirited late show of pressure from Irish pushing them all the way.
The hosts were out of contention of qualifying in the LV=Cup but after securing their eighth win in nine games, Davis admitted a number of players had done themselves no harm in terms of their performance.
"We challenged the guys before the game to keep the momentum that we have going. That win makes it eight wins from the last nine games and to maintain that momentum with four really big Aviva Premiership games around the corner is crucial," he said.
"There were a number of players in the side who haven't played as much as they have liked to have done in recent weeks and today was a really good opportunity for them to stick their hands up for selection.
"You look at the London Irish side that we faced today and there were some pretty well known names in there. We knew it was going to be a test for us.
"We want to be a top six team and to do that you have got to have the depth in your squad.
"All of the top sides up there have that ability to be able to rotate players to get the best out of them every week and today was very encouraging for us in that respect. A few of the guys really showed today that they are up there."
Wasps were looking comfortable but the Exiles managed to get a crucial try before the break from Chris Hala'ufia on his return to the side following a four-week ban.
With Sailosi Tagicakibau having also crossed earlier in the game and Jamie Hagan dotting down on 62 minutes, it set things up for a tense finish.
But the hosts ultimately came up short, with director of rugby Brian Smith knowing exactly where his side had come unstuck.
"We're really not happy with the first 20 minutes," he said. "We didn't have the intensity in the contact area or in defence which was very disappointing.
"We did well to rally and going in (at half-time) at three tries to two in pretty treacherous conditions was fair.
"I thought at half-time with a nine-point difference the game was very winnable with the wind.
"We got field position, got the try we needed to and had a really good shot at them on their try line.
"But we weren't good enough so we're disappointed with that."
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London Wasps: Bell, Howe, Helu (Masi 59), Suniula (Hayter 66), Bassett, Carlisle, Davies (Heeks 76), Vea (Reeves 51), Lindsay (Davies 76), Taylor, (Swainston 49) Rowlands, Cannon, Jackson, Everard, Pitman (Thompson 59).
Replacements not used: Palmer
London Irish: Homer (Fenby 36), Ojo, Mulchrone, Armitage (Ellis 57), Tagicakibau, Geraghty (Dorrain 40), O'Leary (Kennedy 40), Yapp (Parr 40), Mayhew (Stevens 33), Halavatau (Hagan 40), Evans, Rouse, Low, Sinclair, Hala'ufia (Cowan 40).
Tries: Davies, Jackson, Bassett
Conversions: Carlisle (2)
Tries: Tagicakibau, Hala'ufia, Hagan
Referee: Darren Gamage