Milgard aluminum windows / sandblasted block detail

[Spasoff]

Just installed my new thermally broken milgard windows and sliding door. The dark bronze color looks great against the sandblasted block but I' m struggling with the caulking material against the block. I did a 1/4" precision on each side which worked well. I guess the mason back in '69 did a great job with the openings. I used a backer rod on the inside ,DAP low expanding foam and anchored the frames to the block. I thought that I had the details figured out, but when I did couple samples with different latex / acrylic / silicone and repair mortar mix from HD all seemed too light and standing out from the dark colors of the block and the windows. Any experience or materials that you can suggest for seemless transition between the block and the frames will be appreciated. I'll upload some images later ...

[Modman]

If you haven't done it already, try using clear sealant or the black color.

[shertzfeld]

mortar with a acrylic fortifier in place of water works really well and blends much better with the block. This is only good for gaps that are 1/4" and up. Usually all sides that the window meets the block. Use water clear silicone for the top where the window meets the lintel. Make sure you tape both the window and the block before you proceed.

[tom]

For your application, I suggest using gray sanded grout caulking. Find it in the tile aisle at your favorite big box home improvement store or at Arizona Tile. Arizona Tile will have more colors than your favorite big box home improvement store but I think they all carry Natural Gray and/or Delorean Gray.

I would NOT use clear silicone for your application; it will not look good.

Black caulking could work but will be impossible to neatly use against the sand blasted block. It will smear into the pits and look uneven.

If the joints are consistently 3/8" or larger, I use (with great success) standard mortar mix--it's old school but works great.

Take your time and don't rush it no matter which method you use.

[canuck1]

I second Tim's comments!! sound advice. Do not use clear for sure.

[deeds1115]

i've just added similar windows and ca'tn decide on how to handle the interior trim-out (if any at all). would you mind sharing how you framed out the interior? do you have photos that you could share?

thx!