Salvaged wood is worth recovering when it is dry, straight and sound: pry boards free without splitting them, remove every nail at once, cut away checked ends, and judge each piece for rot, insect damage and warp before it is stacked. Solid lumber from older buildings is the best find, plywood is worth keeping only while its layers stay bonded, and water-damaged OSB and preservative-treated wood are best left or handled with care.
Part of Building Material Recovery
A demolished house holds enough lumber for a small cabin, but most of it comes out studded with nails and some of it is rotted, split or chemically treated. Recovery is mostly sorting.
Most Of The Value Is In Solid Boards And The Rest Is Sorting Out What To Leave
The parent article describes a single house as holding enough lumber to build a small cabin. Solid lumber (2x4s, 2x6s, 2x8s and so on) is fully reusable if not rotted or severely damaged. Panel products are more sensitive to water. Everything you recover is full of nails, and a nail left in a board damages saw blades, splits wood during new construction and punctures feet (parent article).
What You Need
- A claw hammer, a cat’s paw, a flat pry bar and pliers.
- Eye protection, gloves and boots.
- An awl or knife for testing wood.
- A dry stacking area, off the ground, with spacer sticks.
Method: Remove, Denail, Judge, Sort, Stack
Step 1: Check the structure. Do not pull any member until you know what it carries; see Structural Safety Assessment.
Step 2: Remove gently. Pry boards free from the side with the flat bar, a little at a time along the length, rather than snapping them off at one point. Boards that split are shorter and less useful.
Step 3: Denail at once. Pull or drive out nails as soon as the board is down; see Denailing & Board Cleaning.
Step 4: Judge each board. Test for rot, insect damage, warp and checks; see Assessing Wood Condition.
Step 5: Sort by type. Solid lumber by size, plywood, engineered beams and treated wood in separate piles; see Dimensional Lumber vs. Engineered Wood.
Step 6: Stack flat and dry. Lay boards flat, with sticks between layers for air, under cover and off the ground. Stack by length so you can find what you need.
Step 7: Keep the offcuts. Short or damaged pieces become firewood (but see the treated-wood and painted-wood cautions below), kindling, wedges and handle blanks.
Common Mistakes
- Prying at one point. The board splits.
- Stacking nailed boards. People step on them and saws strike them.
- Stacking wet lumber tightly. It rots and warps.
- Burning treated or old painted wood. The smoke is toxic; see below.
- Hauling rotten boards. You carry weight that gives no strength.
Safety
Nails, falling timber and toxic wood smoke
A nail pointing up from a discarded board is the most common salvage injury, so denail as you go and wear thick-soled boots. Cutting or pulling a load-bearing member can drop the structure above it. Do not burn pressure-treated wood (greenish tint, copper-based preservative), whose fumes are toxic, and do not sand or burn painted wood from older buildings, which may carry lead paint; see Asbestos, Lead Paint & Other Hazards. Wear a respirator when you cut dusty or mouldy wood.
What’s Next
- Learn next: Denailing & Board Cleaning — removing the nails without splitting the board
- Combine with: Assessing Wood Condition — deciding what is worth stacking