Thank you. There certainly aren't any cracks in the concrete lintel but it does have a measurable bow. I did ask a builder and he seemed to think it was OK but I thought window experts might be able to speak from experience.
Do you think my existing unit is helping to hold it up and would a...
Thanks to Mattylad for help for a newbie
I haven't chosen a door yet, as I wanted to solve the support problem first. I will take some pictures and try to work out how to post them:sleep:
Hermana
I want to change my sliding doors to the garden to bi-folds. I asked an installer who said that although the existing windows were fine, the brickwork above had dropped by about 10 millimetres and he wasn't keen to remove the existing frame to put new bifolds in. There is a concrete lintel...