What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
Teak and cypress can both work for exterior doors, window parts, shutters and trim, but they are not interchangeable. Teak is a dense, oily hardwood with strong natural resistance to decay. Cypress is lighter, easier to work and often less expensive, but its durability depends more on the heartwood content and how well the joinery is detailed and maintained.
Choose by exposure and upkeep
For joinery exposed to frequent rain, standing water or hard-to-reach maintenance, teak is usually the safer choice. Its heartwood resists decay and insects, and it moves relatively little when moisture changes. That does not make it waterproof: end grain, joints and horizontal surfaces can still take up water, and poorly designed details can still fail.
Cypress is a sound choice for sheltered or moderately exposed joinery, especially when you can buy clear, durable heartwood and keep the finish maintained. It is also easier to lift and machine. The catch is that boards sold as cypress can contain a mix of heartwood and less durable sapwood. Check the actual stock rather than relying on the species name alone.
At-a-glance comparison
| Factor | Teak | Cypress |
|---|---|---|
| Rot resistance | High in heartwood | Good in heartwood; sapwood is less durable |
| Weight and workability | Dense and heavy; can blunt cutters | Lighter and generally easier to cut |
| Movement | Low to moderate | Moderate; allow for seasonal movement |
| Fasteners and glue | Oils can interfere; clean surfaces and use compatible products | Usually straightforward, though oily or resinous patches need attention |
| Best fit | High exposure, long service life, premium budget | Sheltered exposure, lighter joinery, tighter budget |
What to inspect before buying
Ask for the board’s moisture content and intended use. For exterior joinery, stock around 8–12% moisture content is a practical target in many climates, but the local equilibrium moisture content matters. Let lumber acclimate under cover before machining, and do not build with wet stock that will shrink after assembly.
Inspect every face and edge for sapwood, checks, end splits and grain runout. On cypress, favor heartwood for exposed parts; pale sapwood is not a bargain if it lands at a sill or lower rail. On teak, look for straight, stable stock without large defects at mortises or tenons. A pin-type wood moisture meter helps verify stock rather than guessing from its weight.
Species labels and grades vary by supplier, so ask what “cypress” means in that market and whether the boards are heartwood. If the joinery will be painted, appearance grade may matter less than sound, dry stock and clean, defect-free joint areas.
Machining, joints and fasteners
Teak’s density makes it harder on blades and bits than cypress. Use sharp cutters, feed steadily and avoid forcing a dull tool, which can burn the surface or tear out around joinery. Teak dust can irritate skin and lungs; use extraction and a suitable respirator. Cypress cuts more easily, but soft earlywood can crush under aggressive clamping or leave a fuzzy surface that needs a final sanding pass.
Both species benefit from joinery that sheds water. Use sloped tops on rails and sills, drip edges where appropriate, and avoid pockets that hold water. Seal end grain and protect exposed shoulders. A small gap that lets water drain is preferable to a tight-looking detail that traps it.
Teak’s natural oils can reduce glue adhesion. Follow the adhesive maker’s instructions; for oily surfaces, a fresh machining or sanding pass immediately before bonding may help, but do not assume every adhesive will bond reliably. A water-resistant exterior wood adhesive is a category to consider, not a substitute for a well-fitted mechanical joint. Use corrosion-resistant stainless steel fasteners outdoors; ordinary steel can stain the wood and fail in wet conditions.
Finishing and maintenance
For a painted finish, both woods need dry, clean surfaces and careful priming. Teak oils can cause adhesion problems, so test the full primer-and-paint system on offcuts before committing. Follow the coating maker’s preparation guidance; a compatible stain-blocking primer may be needed. Cypress can also bleed extractives through paint, particularly where the wood is wet or the coating is damaged. Prime all faces, including end grain, before assembly when practical.
For a clear or translucent finish, expect regular maintenance. Teak left unfinished generally weathers to gray; that is a color change, not necessarily a structural failure. Oils and clear films do not stop weathering permanently. Film finishes can peel when water gets behind them, while penetrating finishes need renewal as they fade. Cypress also needs a maintained coating if you want to preserve its color and limit moisture cycling.
Sand to the coating maker’s specified grit rather than polishing the surface excessively. Many exterior systems call for a finish around 120–150 grit, but check the label: overly fine sanding can reduce coating adhesion. Remove dust, let any solvent used for cleaning evaporate fully, and coat in suitable weather. A primer rated for exterior wood should be part of a compatible system, not chosen in isolation.
Which should you buy?
Choose teak when the joinery is highly exposed, difficult to repaint or repair, and the budget supports premium stock. Its resistance and stability can justify the extra cost, but only if you buy sound heartwood, detail joints to drain and use compatible glue and coatings.
Choose cypress when the work is sheltered, the parts are accessible for maintenance, or lower weight and easier machining matter. It can be the better-value choice, particularly for painted joinery, provided you verify heartwood content and keep water out of joints. If good cypress is available locally at a clear price advantage, there is little reason to pay for teak on a protected trim piece that can be maintained.
0 Comments