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Are you sure those bricks will take the weight of the beam and whatever you plan to put on top of it? If so, I would drill a hole straight through for a long screw, then screw through the hole into another beam/batten on the inside of the chimney, leaving enough of the head protruding on the outside for the beam's keyhole fittings to hang on.
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Lots of full thread ones here https://www.orbitalfasteners.co.uk/categories/hexagon-head-high-tensile-set-screws-grade-8-8-bright-zinc-plated-din-933 although depending exactly what you want to do you may want threaded rod.
Is the beam just decorative? How heavy is it? Some decent plugs and screws would probably be fine if it doesn't weigh a ton.
stevo_com
aggi
@M4xime
This might be a quick one for someone with experience here. Trying to install a wooden beam above our fireplace. However, the fixings that came with the beam are for fixing in a solid wall and where I'm looking to fix I'm coming across only one brick depth and those bricks seems to be of a shape that means the plug and screw would have a significant amount "in the air" on the other side of the brick. Hopefully that makes some sense ...
Therefore, talking with father in law we're thinking of using coach nuts and bolts to be able to secure the fixing in place and potentially adding a steel plate for reinforcement between the nut and brick.
I'm coming across two challenges:
1) Most coach bolts and nuts I find are not threaded all the way, only the end like this one
2) I need to take into account the size of the head so it fits in the pre-built hole/fixing in the beam to attach to the wall, photos here
Any suggestions on what to use for this purpose?