Yes, the metal ‘L’ shaped lintel is installed as shown in the pic with the oak timber sat on it. The brickwork is built on top of the timber and over the 6 years a gap has formed due to shrinkage of the wood.
I will try and insert some thin slate and somehow push in some cement as far as I can...
Cracks have started to appear above oak mantle due to the wood shrinking over the last 6 yesrs since installation. It sits on a metal “shelf” as shown on the photos. The gap between the oak mantle and first layer of cement has increased over time as the wood has dried out and shrunk.
Is it just...