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Your porch could be crumbling due to poor installation, freeze and thaw cycles, or intense pressure washing or sandblasting. If your concrete was poured and cured improperly, moisture can seep into the concrete. When the water freezes and thaws, it causes stress to the structure, leading to cracks and crumbling. If you pressure wash concrete on too high of a setting or sandblast the surface, the concrete can also crumble. 

The main cause of a rotting porch post is prolonged exposure to moisture. So, the best way to prevent rot is to eliminate and guard against moisture.

• Use wood caulk to seal any cracks, openings, or areas along the post where water is likely to pool.

• Secure porch posts into concrete, if possible.

• Cover wooden posts with protective sleeves or wraps, often made of vinyl.

• Install metal post anchors for extra support.

You can’t fix warped composite decking boards, but you can replace them so your deck surface is no longer warped. For more severely warped decks, especially those with damaged joists or support beams, you’ll need a pro to inspect the deck and recommend whether you should replace the structure or repair the damage.

Rotten deck boards can sometimes be repaired, but only if the damage is minor. Repairing small patches of rot involves strengthening the damaged area with wood hardener, filler, or epoxy. More substantial damage requires replacing the boards or rebuilding the entire structure in extreme cases. If the rot extends to the joists, posts, or beams, have a contractor evaluate the damage to ensure it is still structurally sound.