Waterproofing a rooflight to a brick upstand against a wall

[dodgem]

Hi all,

I have a lightwell in my basement, and I've ordered a glass access hatch over it, with trickle vents.

I'm going to build a brick upstand about 150mm/2 bricks high to 3 sides of the lightwell.

The 3rd side is against a wall, so I will fix a batten on here so the rooflight kerb has something to fix to on all sides.

Can anyone recommend best way of waterproofing between the brick/timber upstand and the rooflight kerb?

I was think some membrane I've the timber dressed up the wall, overlapping a membrane to the top of the brick kerb.

Any advice much appreciated

 

[foxhole]

Timber likely to rot quickly ,use brick or similar all round.