Installing aluminium profile cill

[6ply]

I plan to fit an aluminium profile cill (type 3) as shown in the images below. The rear upstand can be securely screwed into position. Vertical cladding (fitted to battens and counter battens) will terminate just above the cill, so there won't be any weight bearing down directly. The cill will cover house bricks laid frog up. The frogs are currently unfilled.

I've seen these cills used in similar applications. Are the frogs best filled with mortar first at same shallow run off angle as the cill, and then given a thick bead of silicon? Or are packers used? The cills will be installed low level but above DPC, and I don't want to leave large voids for creepy crawlers to enter.

 

[Agroshield]

Are the frogs best filled with mortar first

Is it a door or a window?

With empty frogs, if someone mis-steps and plants the toe of their boot on the cill, a dent will appear above the frog.

 

[6ply]

Is it a door or a window?

With empty frogs, if someone mis-steps and plants the toe of their boot on the cill, a dent will appear above the frog.

Not a door or window. It's the interface between vertical timber cladding and a low brick wall.

But yes, the same thought occurred to me.

 

[6ply]

Maybe a squirt of expanding foam before laying the cill in position? But I'm messy with the stuff.

 

[addjunkie]

You could use lead for the same purpose, but something filling the void or will deform easily.