Hi all, first post. I am replacing PVC covered rotten posts (2x4 sandwiched) with solid wood 6x6 posts. The PVC is anchored at the bottom only and the wood inside is just nailed in. We have severe wind here, the plan is to keep the roof on the house. I do not know the best way to anchor them on the bottom, with the vacant hole left by the old posts. Top is no problem. All input appreciated. Thank you.