Timber framed extension window water proofing

[Princey791]

I had a builder make a. Start on a timber framed extension shell I’m having render board and render the builders disappeared after I found out the base was not properly done and kept calling him back for leaks. I’ve removed render boards and there’s no flashing round windows or drip tray etc I’m unsure of what to use above the window to protect the window from above I’ve seen alsorts ie z flashing I’m stuck on what to do I can’t afford to get another builder in so have to myself any ideas would be a great help

 

[freddiemercurystwin]

This is what we're doing on timber frames ATM but in addition to this we're adding an adhesive tape to connect the VCL and the breather membrane to ensure water and air tightness eg https://airtightnesstapes.co.uk/pro...n1s1iiZargOQeDXFfLRTIVe7szOt5hBBoCZWAQAvD_BwE