Deck & Fence Washing Scope Guide

Wood and composite deck and fence washing scope.

Blasting cedar, redwood, or pressure-treated pine with high water pressure tears soft springwood fibers and leaves fuzzy "furred" boards and wand stop-marks. A clear deck or fence quote explains the cleaner chemistry, wood brightener step, sanding, and how railings and spindles are counted.

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Four scope items for decks and fences

Whether you have bare wood, peeling stain, or composite decking, make sure every quote addresses these four points.

1. Wood cleaning & brightening

Two-step wood restoration vs raw pressure:

Oxygenated wood cleaners (sodium percarbonate) or mild stripper solutions loosen gray UV-damaged fibers and mildew so the crew can rinse at low pressure (500 to 800 PSI) along the length of each board.
Following the wash with an oxalic-acid or citric-acid wood brightener neutralizes alkaline cleaner residue, restores natural cedar or pine tone, and opens wood grain to accept stain evenly.

2. Composite & PVC decking

Capped polymer vs early-generation composite:

Modern capped composite boards (such as Trex or TimberTech) should be soft-washed with a composite-safe cleaner and rinsed with a wide fan tip, never a rotary surface cleaner.
Older uncapped wood-plastic composite boards hold deep black mold spots in the wood flour and need gentle chemical dwell time rather than close-range nozzle pressure that scars the board surface.

3. Stripping old stain vs maintenance wash

What is on the wood right now:

Clear or semi-transparent penetrating oil stains can usually be cleaned, brightened, and recoated without heavy stripping.
Peeling solid-color acrylic deck stain or failing spar varnish requires chemical stripping and orbital sanding on handrails and floor boards before new finish can bond.

4. Drying window & stain application

Why same-day wash-and-stain quotes fail:

Wood must dry below 12% to 15% moisture content (typically 48 hours of dry weather after washing) before oil or waterborne stain goes on.
Check whether spindles and lattice are sprayed and back-brushed, and how house siding and patio concrete below the deck are masked from stain overspray.

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