cbryancu t1_jc4x8xb wrote on March 14, 2023 at 1:39 AM

You could get a Mason bag (kind of like a pastry bag for frosting) and use mortar to fill gap. Tap mounding and brick to give nice clean straight finish.

Sure-Leg-6769 OP t1_jc56ejt wrote on March 14, 2023 at 2:49 AM

So basically carve the foam out a bit and squeeze some mortar in there. Not a bad idea.

What is tap mounding?

s4turn1ne t1_jc5a0kv wrote on March 14, 2023 at 3:19 AM

Think they meant "tape" for a clean edge

Baneken t1_jc9ahae wrote on March 15, 2023 at 5:15 AM

No, you place a metal strip over it. That's how professional window & door installers like me do it in Europe.

Like this