Composite decking

[gaz1234]

Hello
I’ve had some composite decking installed but a general builder. He had issues with the glue supplied and recommended by the supplier dino decking, in that the side neutral slats were falling off within a day or two.
He had since screwed some of these to the frame, which cosmetically isn’t great and some have split a little.
The latest is that there was a gap which needed tidying up at the rear between the deck and the wall. He fitted the right angled stuff, and again it fell off within a day. He used some other glue product.
See below.
What would you guys use to stick it? Ct1?
Cheers

 

[foxhole]

I would be more concerned about how close it is to wall, assuming it’s the house external wall.
Could breach damp course and or cause damp issues.

 

[gaz1234]

It’s render and steps not the main house

 

[yorksbuilder]

I used stixall for this purpose, it's similar to CT1. It lasted for about 18 months before the trim fell off. I think if you clean the areas carefully with meths or alcohol and then maybe slightly rough up with sandpaper and use CT1 it should stick okay.

 

[gaz1234]

I screwed it down