Cavity trays oversailing lintels

[MortarThePoint]

The NHBC guidance documents show the outer edge of the cavity tray DPC going past the edge of the lintel (see below).

 

I've not noticed this done and have seen it trimmed back from the edge, for example this video.

 

What did people do themselves here? I'm not sure which presents the greater risk of capillary action drawing water into the cavity under the DPC of the cavity tray?

 

 

 

 

[PeterW]

Cut back is fine... You're more likely to get water through the side joints on the windows than the protected heads and lintels. 

[MortarThePoint]

1 minute ago, PeterW said:

Cut back is fine... You're more likely to get water through the side joints on the windows than the protected heads and lintels. 

 

It also does feel like it would be hard to bed the bricks properly without trimming it back.

[epsilonGreedy]

41 minutes ago, MortarThePoint said:

It also does feel like it would be hard to bed the bricks properly without trimming it back.

 

 

My thought as well. Last week my brickie team bedded in the upstairs window lintels and while helping with menial jobs up on the 2nd lift staging I saw the cavity tray being trimmed and said "feel free to trim it back in favour of a larger mortar bond". With only 3 courses exposed above the window and sheltered by the eave overhang, I felt moisture ingress was a minor concern.