Fence post spacing and depth
Set fence posts 8 ft apart for wood, vinyl and composite fences, up to 10 ft for chain link. Bury a third of each post: 3 ft for a 6 ft fence, on 6 in of gravel.
3 pages
Paver base
A paver patio or walk needs at least 4 in of compacted crushed-stone base, a driveway 6 in, with 1 in of concrete sand on top. What to use, how deep to dig and how to compact it.
Retaining wall drainage
Retaining wall drainage as Allan Block builds it: ¼ to 1½ in clean gravel in the block cores and 12 in behind, a drain pipe for walls over 4 ft or wet sites, vented every 50 ft.
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Paver calculator for patios, walkways and driveways: pavers with 10% extra for cuts, tons of base gravel, bags of bedding sand and polymeric sand, and how deep to dig.
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Retaining wall block calculator: courses, blocks and caps for your wall, the base trench, tons of wall rock and drain pipe, with the 4 ft limit that needs an engineer.
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Wood fence calculator: posts, 2×4 rails and boards for your fence and gates, how deep to set the posts and how many bags of concrete each one takes.