What kind of problems can you run into hanging heavy Mirrors and Picture Frames on a ICF wall with only drywall? Solutions?

What kind of problems? Well the same as you might run into in a stick-built wall with drywall... None really, if you screw thru the drywall into a stud or in he case of ICF, a crosstie You use the type of hook that looks like a washer with a hook tab bent on it. If it is really heavy you might want to add a thin plate under the hooked washer to spread the force out over the surface of the drywall as the crosstie is a little farther back from the drywall than a stud would be... This is the same as how you would seek out a stud to hang really heavy objects from on a stick framed wall, except the ICf crossties are typically every 8" instead of every 24" like a stud...

Posted By ronmar on 30 Apr 2017 05:24 PM
What kind of problems? Well the same as you might run into in a stick-built wall with drywall... None really, if you screw thru the drywall into a stud or in he case of ICF, a crosstie You use the type of hook that looks like a washer with a hook tab bent on it. If it is really heavy you might want to add a thin plate under the hooked washer to spread the force out over the surface of the drywall as the crosstie is a little farther back from the drywall than a stud would be... This is the same as how you would seek out a stud to hang really heavy objects from on a stick framed wall, except the ICf crossties are typically every 8" instead of every 24" like a stud...

How do you hang a curtain rod above a window Ron?

To create strong attachment points we are planning to use the oneplate bracket from RP Watkins: http://store.watkinshanger.com/Custom-Orders/One-Plate-Series/OP3-Series/
Just embed it in the wall and pour the concrete.

Curtain Rods? I would attach them the same basic ways I would attach anything else to an ICF wall.

1. Line the curtain rod hangars up with the ICF crossties.
2. Before drywall, Relieve/remove a little bit of foam between at least two crossties in the area where you think curtain rods will need to be mounted. inlay a piece of plywood into the foam so the face is flush with the surrounding foam. Screw this plywood to the adjacent crossties. Refill any foam voids with spray foam and cut flat/flush with the ply/foam surface, then install the drywall over the foam/plywood surface.
3. Use longer screws and a hammer drill and engage the concrete directly.

If you can't drive a screw into a block tie then use a conical screw type drywall anchor. They work good and hold up several pounds, which I don't recall. My kitchen cabinets are held up with screws into the block ties.