I have a condensation problem in my home and it seems that it is down to poor ventilation as all the windows are double glazed with no vents. So, I have bought some trickle vents from the company who recently built our conservatory.
Question is: what is the best way to drill through the steel in the frames. I have started by marking and drilling a series of holes, but this will take a very long time! Is there a better drill bit (for Bosch SDS) or better yet I need a router - will Rotozip do the job?
Thanks in advance for any advice!