I'm trying to drill holes in the concrete above windows to put new curtain rails in. I can drill about 2-3mm with normal masonary drills before they stop going in.
What is it that might be causing this? happens on top of all windows.
How can I drill through a good 5-6mm so that the screws can retain the rails? I've tried using the screws to this depth and then apply no-nails as well, but that can't hold the curtain rails.
thanks for answers
What is it that might be causing this? happens on top of all windows.
How can I drill through a good 5-6mm so that the screws can retain the rails? I've tried using the screws to this depth and then apply no-nails as well, but that can't hold the curtain rails.
thanks for answers