Reclaimed wood and material reuse: charm with history in your home

Updated on 07/06/2026 by EZA Engenharia

Reclaimed wood brings two things to the home that new material does not deliver: history and a charm you cannot buy ready-made. On top of that, it is a genuinely sustainable choice, because it reuses fine pieces that would go to waste. But there is a catch: without correct treatment and application, the dream turns into a headache, with termites, warping and hidden nails ruining tools. We speak from experience: Casa Bloco, a project EZA built in Criciúma, used reclaimed wood and took 3rd place in the residential category of the Saint-Gobain Architecture Award, in the sustainable habitat line. In this text we share what we learned about choosing, treating and applying this material.

The charm that only aged wood delivers

Much of the demolition wood available on the market comes from old mansions, warehouses and structures built decades ago, when it was common to build with dense species like peroba rosa and ipê. These are woods that today have restricted harvesting or simply no longer arrive with that quality. Each piece carries holes, joinery marks and a tone that no new finish imitates.

And there is a technical advantage hidden in this charm: these pieces dried naturally over decades. Well-dried wood moves less, warps less, and takes finishing better. In practice, a well-selected old peroba tends to be more stable than a lot of new wood that leaves the sawmill in a hurry.

Real sustainability, not for show

Reusing wood avoids cutting down a new tree and rescues from disposal a material that nature would take decades to replace. In an ordinary demolition, these pieces would become rubble or firewood. Giving them a second life is one of the most concrete gestures of sustainable architecture that a house can have.

But sustainability requires provenance. There is illegal wood sold out there as if it were demolition wood. Buy from a supplier that can prove the origin of the pieces, coming from documented dismantling. Without that, the green discourse falls apart and the risk becomes yours.

Treatment: the stage that separates charm from headache

Reclaimed wood arrives from dismantling with hidden nails, decades of grime and, sometimes, an unwanted visitor: termites and borers. Installing it without treatment is asking for trouble. Proper preparation begins before any saw goes into action.

The final finish depends on the use. Varnish and sealer protect better in indoor areas, while oils and stains work better where the wood needs to breathe. The mistake we see most is applying an indoor-area product on a balcony and seeing everything peel off in a short time.

In practice, the workflow that works is this:

• Piece-by-piece inspection, with a metal detector to find hidden nails and staples
• Pest inspection and treatment against termites and borers before any finishing
• Measured cleaning, planing and sanding, preserving the marks that give the piece character
• Acclimatization on the project site before installation, so the wood adjusts to the local humidity

Where reclaimed wood works (and where to think twice)

Wall panels, ceilings, pivot doors, built-in furniture and headboards are almost foolproof applications: a protected environment, little humidity, and the wood becomes the protagonist of the space. Covered decks and pergolas also work well, as long as the finish is for external use and maintenance becomes part of the home's routine.

Where to think twice: direct contact with the soil, areas of constant moisture and structural use. Reusing wood as a beam or column is possible, but it requires an engineer's assessment piece by piece, because no one knows the load history of that piece. When it comes to high-end construction materials, the rule applies doubly: beautiful material in the wrong place is costly.

Casa Bloco: reclaimed wood in an award-winning project

We saw up close what this material delivers when it is well used. Casa Bloco, a 247 m² residence in Condomínio Jardins, in Criciúma, combined exposed concrete, metal roof tiles and reclaimed wood in a concept of roof blocks that seem to float. The design is by ES Arquitetura, by the architect Diego Justo do Espírito Santo, with interiors by Amanda Maria Miraglia. The execution was ours, by EZA Engenharia.

The result traveled the world. The project placed 3rd place in the residential category of the 7th Saint-Gobain Architecture Award, in the sustainable-habitat category, won 1st place in the residential category at UDAD 2019, was nominated for ArchDaily's Building of the Year 2020 and made it to a show running alongside the Venice Architecture Biennale. For us, the lesson stands: reclaimed material, well treated and well applied, competes on equal footing with any new finish.

Reclaimed wood is not a fad. It's a material with history, proven performance and a sustainable footprint that suits those who build with decades in mind. The secret is in the criteria: confirmed origin, complete treatment and application in the right place. After more than 35 years of building in Criciúma and the surrounding region, and with an award-winning house using this material in our portfolio, we know where it shines and where it suffers. If you want to use reclaimed wood or another repurposed material in your project, reach out to EZA on WhatsApp (48) 99191-2018, write to [email protected] or get to know our projects at eza.com.br.