PIR plasterboard fixings - plastic cover caps or tape over?

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Hello

I'm putting up 62.5mm PIR plasterboard via dot and dab and was going to use Timco metal PIR fixings as a secondary mechanical fixing. I planned to tape over the heads but I see they do plastic cover caps which says 'help' eliminate cold bridging. Are they a good idea or will taping over suffice? Thanks
 
You using foam or powdered adhesive to fix PIR.
Get a good fixing you don't really need anything else but to answer, use the plastic.
Then tape over.
You using tapered edge PIR?
 
Thanks. Will be using Knauf adhesive and tapered edge PIR.

I thought the mechanical fixing was advised e.g in case of fire - not as many fixings as you would if it was the primary fix?
 
Yes, I’m following Charlie..

I’m thinking dot and dab will better on a full wall where I need to level it up, and maybe foam on the reveals.

Why do you prefer foam, and which brand?
 
Foam is not effected by any damp.
It's not brittle.
Easier to use.
Less mess.
Just not much grab with it so I use a bit of polymer grab with the foam.

Low expansion foam for board. Any
 

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