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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. 

Your deck may pop, and your neighbor’s deck may not for a number of reasons. Whether or not a deck pops will depend on how it was made, the conditions it’s exposed to, and the materials. Improper spacing is a common reason for increased pressure between deck boards. Moisture penetration is another.

When installing deck boards, screws are a better option than nails. For one, screws have more holding strength than nails, so they’re better at keeping your deck boards in place. Also, nails are more likely to pop out of the boards than screws, which can create a tripping or poking hazard on your deck.

Composite decking may never warp, or it may warp quickly. Several factors can influence the rate of warping, including the material's quality, installation method, and installation location. Generally speaking, high-quality materials that have been installed properly are drastically less prone to warping.