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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. 

Deck pier blocks are one alternative to traditional deck footings. Unlike poured concrete and buried post footings, deck blocks don’t require digging or pouring. They’re best for small or low-to-the-ground decks. Keep in mind, though, that not all areas allow the use of deck pier blocks, so consult your local building codes before choosing them for your deck.

The signs of rot depend on the type. Dry rot looks like cube-shaped cracks with a fluffy white, cotton-like texture. Wood with dry rot may also have a strong, musty smell. 

Signs of other types of rot include wood that looks mushy or has black spots. The wood may crumble or give way when touched.

Lattice should not touch the ground, as it creates a possibility for rot and a termite infestation. It’s best to leave a gap of 3 or 4 inches at the bottom for airflow and to keep the wood dry. You can add stones, bricks, or other decorative pieces to conceal the bottom of the lattice if desired.