Patio has been down 20 years and is slabs laid on sub base and sand, no cement. I want to fix to pergola posts to the patio and was thinking of lifting two slabs, digging out 10cm depth and relaying the two slabs on cement. I would then drill through the slabs and cement to attach the post fixing brackets. Does this sound ok or mad? Cheers
As you are planning on lifting the slabs anyway, I would dig down and concrete post straight in. Much stronger than fixing bracket.
If I do that then it’s a job of getting hold of a saw to fit the tile back in which is why I though the bolt down bracket would be easier for my limited skill set.
most people cut the square hole with an angle grinder. Have a look at what the water board do when there is the water meter set in the pavement. I hear what you're saying with experience and available tools. Pergola are more stable than a fence post but I have seen strong winds pull fence posts that have been bolted to spurs.
Thanks for the advice. Dug 2 foot holes and concreted posts in and looks a proper job Can I also ask about joining main side beams to post. The side beams are 5x2 and the posts are 90x90. Are coach bolts the best fixing and if so, what diameter should I get. Thanks