Hi,
I have been given (by two builders) completely contradictory advice.
I am building a single-storey, flat roof extension, and where the roof joins the back wall of the house I have been advised on two methods.
1. Cut a narrow slit across the brickwork to push lead flashing into.
2. Remove rows of bricks and fit cavity trays.
Builder 1 said there was no need for cavity trays. Builder 2 said they were essential!
Can anyone shed any light on who might be right, or if it's a matter of opinion?
I have been given (by two builders) completely contradictory advice.
I am building a single-storey, flat roof extension, and where the roof joins the back wall of the house I have been advised on two methods.
1. Cut a narrow slit across the brickwork to push lead flashing into.
2. Remove rows of bricks and fit cavity trays.
Builder 1 said there was no need for cavity trays. Builder 2 said they were essential!
Can anyone shed any light on who might be right, or if it's a matter of opinion?