Using reclaimed wood outdoors requires a different approach than interior applications. Exposure to rain, UV radiation, temperature swings, and ground contact creates conditions that can destroy the wrong material in just a few years — but with the right species selection, preparation, and maintenance, reclaimed wood can deliver decades of beauty and service in outdoor settings. In some cases, reclaimed wood actually outperforms new wood outdoors because it has already proven its durability through years of real-world exposure.
Species That Excel Outdoors
Not all wood species perform equally in outdoor conditions. For reclaimed lumber in outdoor applications, focus on naturally durable species:
Tier 1: Exceptional Outdoor Performance
Western Red Cedar — The gold standard for outdoor wood in the Pacific Northwest. Cedar's natural oils (thujaplicins) provide exceptional resistance to decay, insects, and moisture. Reclaimed cedar from old fences, decks, and siding has already demonstrated its outdoor durability. Cedar silvers gracefully when left unfinished, developing the classic Pacific Northwest weathered look.
Redwood — Second only to cedar in natural outdoor durability. Redwood's tannin content provides natural resistance to decay and insects. Reclaimed old-growth redwood, with its tight grain and high heartwood content, is even more durable than new-growth redwood, which typically contains a higher proportion of less resistant sapwood.
White Oak — The tyloses that make White Oak waterproof in barrel-making also make it exceptionally resistant to moisture penetration in outdoor applications. White Oak is dense, hard, and naturally resistant to decay. It is an excellent choice for outdoor furniture, railings, and non-ground-contact applications.
Tier 2: Good Outdoor Performance with Treatment
Douglas Fir — Not naturally decay-resistant like cedar or redwood, but old-growth Douglas Fir's density and tight grain provide better outdoor performance than new-growth fir. With a quality exterior finish or preservative treatment, reclaimed fir can serve well in protected outdoor applications (covered porches, pergola roofs, non-ground-contact locations).
Heart Pine — The high resin content of old-growth Heart Pine provides moderate natural decay resistance. Best used in protected outdoor applications where direct ground contact and sustained moisture are avoided.
Tier 3: Interior Only or Protected Applications
Maple, Cherry, Walnut, Chestnut — These species lack natural decay resistance and should not be used in exposed outdoor applications. Use them for outdoor furniture that will be stored under cover when not in use, or strictly for interior projects.
Outdoor Project Ideas and Specifications
Reclaimed Wood Deck
A deck built with reclaimed wood is a statement of sustainability and style. Cedar and Redwood are the primary species choices for deck boards.
Specifications:
- •Deck boards: 5/4 x 6 (minimum) reclaimed cedar or redwood
- •Joist spacing: 16 inches on center (12 inches for thinner boards or high-load areas)
- •Fasteners: Stainless steel or coated deck screws. Never use uncoated steel with cedar or redwood — the tannic acid will corrode the fasteners and create black staining
- •Drainage: Allow 1/8 inch gap between boards for drainage and expansion
- •Clearance: Maintain at least 18 inches of clearance between the bottom of the deck structure and the ground for air circulation
- •Foundation: Use modern pressure-treated lumber or steel posts for ground-contact structural elements. Reclaimed wood should not be used for posts or members in direct ground contact unless it is a naturally durable species and you accept that replacement may eventually be needed
Reclaimed Wood Pergola
A pergola built from reclaimed timbers creates an outdoor room with extraordinary character. The scale and patina of large reclaimed beams are perfectly suited to this application.
Design considerations:
- •Main beams: 6x8 or larger reclaimed Douglas Fir or cedar timbers
- •Rafters: 4x6 or 4x8 reclaimed fir or cedar
- •Cross pieces (purlins): 2x4 or 2x6 reclaimed material
- •Posts: 6x6 minimum, set in post bases that elevate them above ground contact
- •Connections: Use galvanized or stainless steel hardware for all connections. Decorative steel brackets add industrial character while providing structural integrity
Reclaimed Wood Fence
A fence built from reclaimed boards has a warmth and authenticity that no new fence can match. Weathered barn wood is particularly effective for fencing because its gray patina integrates naturally with the outdoor environment.
Construction tips:
- •Posts: Use modern pressure-treated posts for ground contact. Set in concrete to prevent shifting
- •Rails: 2x4 reclaimed fir or cedar rails connecting the posts
- •Boards: Reclaimed barn wood, cedar, or fir boards, either butted tight for privacy or spaced for a semi-open design
- •Top cap: A 2x6 reclaimed board on top of the fence prevents water from penetrating the end grain of vertical boards, dramatically extending the fence's life
Preparation for Outdoor Use
Moisture Management
- •All reclaimed wood for outdoor use should be kiln-dried to 12-15% moisture content before installation. Outdoor wood will eventually reach equilibrium with the local climate, but starting at a controlled moisture level prevents excessive initial shrinkage
- •Apply finish or treatment before installation, coating all six sides of each piece including end grain. End grain absorbs moisture up to 12 times faster than face grain, so sealing end grain is critical
Finish Options for Outdoor Reclaimed Wood
Penetrating exterior oil (recommended):
Products like Penofin, TWP (Total Wood Preservative), and Armstrong Clark penetrate the wood fiber and protect from within. They do not peel or flake like film finishes, and they can be refreshed by simply cleaning the surface and applying a new coat. Reapply every 1-3 years depending on exposure.
Transparent exterior stain:
Provides UV protection and water repellency while allowing the wood's grain and character to show through. Choose a product specifically designed for exterior wood. Semi-transparent stains provide more UV protection than clear finishes while still showing the wood's character.
Natural weathering:
Cedar and redwood can be left completely unfinished to weather naturally to a silver-gray patina. This is a legitimate design choice, but the wood should still be treated with a water repellent to prevent excessive moisture absorption and the accelerated decay it causes.
Avoid film-forming finishes outdoors:
Exterior polyurethane, varnish, and paint will eventually crack, peel, and blister when applied to horizontal outdoor wood surfaces. The moisture trapped beneath a failing film finish actually accelerates decay. Stick with penetrating finishes for outdoor reclaimed wood.
Maintenance
- •Inspect annually for signs of decay, particularly at connections and ground-contact areas
- •Clean with a wood-safe cleaner and soft brush. Avoid pressure washing, which can damage the aged surface of reclaimed wood
- •Reapply penetrating finish per the manufacturer's schedule
- •Address any areas of standing water or poor drainage that could accelerate decay
- •Replace individual boards as needed — one of the advantages of board construction is that components can be replaced individually without rebuilding the entire structure
Outdoor reclaimed wood projects deliver the same sustainability benefits, unique character, and historical depth as interior applications, with the added pleasure of enjoying them in the open air. Choose your species wisely, prepare the material properly, and maintain it regularly, and your outdoor reclaimed wood project will reward you for decades.