Adhesive for foam board soffit

[dangti6]

I have a length of soffit board which runs under a steel beam (garage door opening). 
 

 

It is held on an external frame behind the fascia, but before the door frame goes on rendering access difficult, I’d like to add some adhesive between the steel and soffit for insurance.

 

I have some pink grip adhesive to hand which states not for use with plastic laminated foam board. I checked the tube as I feared there could be a case of show through, melting etc. 

Solvent free adhesives require one material be porous. 

Superglue is my strongest contender at the moment. 

 

Could anyone recommend an adhesive for this application? 

[PeterW]

dryfix foam.