To attach 6x6 posts to an existing concrete slab without breaking it up, using post anchor saddles is a great option. These saddles are specifically designed for this purpose and can provide a solid connection. Here are the steps to follow:
1. **Choose the Right Anchor**: Look for heavy-duty post anchor saddles made for 6x6 posts. They typically come with pre-drilled holes for easy installation.
2. **Select the Right Fasteners**: Use concrete anchors, such as wedge anchors or concrete screws, that are suitable for the weight and load of your structure. The length will depend on the thickness of your slab, but typically, 4-6 inches should suffice.
3. **Drill Holes**: Use a hammer drill with a masonry bit to create holes in the concrete where you will place the anchors. Make sure to follow the manufacturer's guidelines for spacing.
4. **Install the Anchors**: Insert the anchors into the drilled holes and secure them tightly.
5. **Attach the Post Saddle**: Once the anchors are in place, position the post saddle over them and secure it according to the manufacturer's instructions.
Costs for materials can range from $10 to $30 per anchor, but hiring a licensed contractor for installation might cost between $50 to $100 per hour, depending on your location.
As a next step, consider getting 2–3 local quotes on Handyman.com to find a reliable professional who can assist with this project.
— Assisted answer