Gaps in cavity closers

[WWilts]

Windows. Vertical and horizontal cavity closers have small gap between (careless cutting by builder probably).

 

How to close the gap?

Is Contega Solido tape waterproof enough and adequate?

[PeterW]

Cavity closer should never see water so it’s fine although what are you wanting to achieve..?

[WWilts]

1 minute ago, PeterW said:

Cavity closer should never see water so it’s fine although what are you wanting to achieve..?

Water percolating through outer leaf (brick or reconst stone) needs to be kept out of the interior of the house.

Gap in cavity closers (joint between vertical and horizontal) is the weak spot. Trying to seal that.

[Mr Punter]

As per @PeterW the door or window frame and sealant around them keep the water out.  Cavity closer helps stop water and cold air tracking across.

[PeterW]

Contega tape is also fleece backed so if you expose it to water on one edge it will act as a capillary mat. 
 

And a horizontal gap between the edges of the cavity closer won’t allow any water across. 

[WWilts]

5 hours ago, PeterW said:

horizontal gap between the edges of the cavity closer

Sorted. The vertical cavity closer will be continued down into the cavity for 50mm. No wind-driven rain penetrating the outer leaf can make its way past such a vertical cavity closer. Plus tape to seal the vertical-horizontal junction for airtightness.