Ipe vs. Composite Decking: Total Cost of Ownership Over the Full Life of the Deck

The Real Question Is Cost Per Year of Service

Composite decking wins the first invoice and Ipe wins the fifty year invoice, since a properly detailed Ipe deck runs through one to three composite service cycles on the same substructure before it needs replacing. Everything after this sentence is detail: how long each surface lasts, what it demands while it serves, and what happens on the day a crew tears it off. None of that detail changes the direction of the answer, though it does change the size of the gap.

Buyers compare decking the way they compare almost nothing else they specify. Roofing gets a life cycle model. Glazing gets a life cycle model. Decking gets a material quote and a gut feeling, and the gut feeling is calibrated on the first number anyone hears.

Divide total spend by years of service and the ranking inverts. A surface that costs more up front and stays flat for four decades beats a surface that costs less up front and gets demolished at year twenty five. The inversion point is not at year forty. On most commercial decks it arrives well inside the first mortgage, and by then the decision has already been made by somebody who left the project years earlier.

A Decking TCO Model Has Five Buckets, Not One

Total cost of ownership on a deck is acquisition plus installation plus annual maintenance plus mid life repair plus end of life replacement including demolition and haul off, and the material quote is the smallest of the five on any deck expected to serve past twenty years. Once the five buckets are on the page in front of an owner, the choice stops being a matter of taste and starts being arithmetic anyone can check.

Acquisition is the board. Installation is the crew, the fasteners, the blades, the framing and the waste factor. Maintenance is whatever the surface asks for each year to hold the condition the owner will accept. Repair covers the boards that fail early, get gouged, get stained, or take a dropped grill. Replacement is the entire surface again, plus removal of the old one, plus the days the space earns nothing.

Composite concentrates its whole advantage in bucket one and part of bucket two. Ipe concentrates its whole disadvantage in the same place, then goes quiet for four decades. Most spreadsheets stop at year ten, which is exactly the window where composite still looks unbeatable.

There is a sixth line that belongs in both columns and lands in neither. The substructure. It gets its own section below, because on a replacement event it changes the shape of the answer more than any board specification does. The WoodWorks technical resource library is a reasonable place to start for anyone assembling a defensible life cycle model on a wood assembly.

Service Life Is the Term That Swamps Everything Else

Ipe delivers a field documented service life above ground in the range of forty to seventy five years with no chemical treatment, while capped wood plastic composite carries warranty terms and a design horizon that run twenty five to thirty years, the number its own manufacturers plan around. No other line in the model moves the result as hard as that ratio does, which is why it is worth being precise about where those numbers come from.

Ipe earns its number through density and extractive chemistry rather than anything applied at the mill. It runs about 1,050 kg/m3, it lands near 3,680 lbf on the Janka scale, and it is rated Class 1 under EN 350, the top durability band. The USDA Forest Products Laboratory Wood Handbook covers the mechanism in its natural durability chapter, and the pattern holds across the dense Brazilian and Central American species: heartwood extractives make the fiber unattractive to fungi and insects, and the density leaves almost no void space for water to occupy.

Composite decay resistance is a different mechanism with a different failure curve. The polymer matrix does not rot. The wood flour inside it can still take on moisture, the cap can check or abrade, and the assembly's real limit tends to be surface degradation and creep rather than biological attack. Composite decking is evaluated under ASTM D7032, which sets out the test protocol for structural and durability performance of wood plastic composite deck boards, and manufacturers publish warranty terms against it. Read those terms closely. Commercial warranty language is routinely narrower than the residential language on the identical product, and fade and stain coverage usually runs on a shorter clock than structural coverage.

Solid wood carries no warranty and never will. It is an organic material with variation baked in, and no honest supplier will write a performance guarantee on it. What Ipe offers instead is decades of field record on installed decks, which is a harder thing to fake than a document.

How Ipe, the Tropical Alternatives and Composite Actually Compare

Ipe sits at the top of the hardness and durability stack among commercially available decking species, and most of the tropical alternatives trade measurable service life for a lower entry point in a way that is predictable enough to model, with teak the exception that trades hardness instead. The table below is the short version of the published species data.

The last column is the one to sit with. The second to last column is the one that decides mid life repair. A gouged Ipe board sands out and disappears into the field. A gouged composite board has a compromised cap, and the fix is a new board that will not match the weathered ones around it.

Two categories deserve mention outside the table. Western Red Cedar remains the default standard across much of the country and handles freeze thaw cycling as well as anything on the market, which is why complaints about cedar failing are rare. Specify it correctly and it performs: CVG and STK are separate products serving separate markets, and treating them as interchangeable is where cedar projects go sideways. Modified woods hold the middle ground and do carry real manufacturer warranties, Accoya along with Thermory and Abodo Vulcan among them, but kiln size caps them around 16 feet, with the metric lengths landing just under that. Long clear runs on a commercial deck rule them out on geometry alone. Species by species data on most of these is published on the Wood Database entry for Ipe and its companion pages.

Installation Is Where Ipe Gives Ground

Ipe costs more to install than composite, and any TCO model that ignores that is not worth showing a client. The same density that buys four decades of service life is the thing that slows a crew down on the way in.

Ipe blunts blades. It needs pre drilling for face screws. It rewards a crew that has run it before and punishes one that has not. Composite installs faster, cuts with standard carbide, and forgives a less experienced crew. On the labor line composite wins, and the gap is real enough to matter on a large deck.

The gap narrows once fastener systems enter the picture. Only tongue and groove profiles accept hidden fasteners. Shiplap on an exterior deck takes visible fasteners, full stop, and any claim otherwise is a callback waiting to happen. Clip systems require clip specific grooved profiles rather than standard tongue and groove, and mixing those two up is one of the most common errors on submittal drawings. Every board runs on furring strips or joists, never directly on a membrane or a slab, and where a grooved profile is used the grooves face down so water drains instead of collecting.

Coastal work adds another line. Use 316 stainless fasteners within the salt zone. Anything less will bleed, and the streaks show up on a light colored deck within a season.

Estimate material honestly. A 5/4x6 board covers about 2.1 linear feet per square foot of deck, so the linear footage climbs faster than people expect on a wide terrace. Ipe should arrive and be installed at 12 to 16 percent moisture content, which is the in service range for exterior work in most of the country, and boards that show up wetter will move after installation no matter how good the detailing is.

What Each Surface Actually Asks For Every Year

Neither material is maintenance free, and the honest framing is that Ipe maintenance is optional while composite maintenance is mandatory but light. That distinction gets lost in almost every sales conversation on either side.

Ipe left alone weathers to a silver gray and loses nothing structurally. The color goes. The wood stays. An owner who wants the brown holds it with a UV inhibiting penetrating oil on a cycle set by exposure, which on a south facing rooftop means annually and on a shaded ground level deck can stretch considerably further. That cost is a choice, and an owner can stop making it in any given year without consequence beyond appearance.

Composite asks for washing. Mildew colonizes the cap surface in shaded damp conditions, and the wood flour in the core feeds it wherever the cap is breached. Manufacturers specify cleaning intervals and cleaning agents, and the warranty language usually leans on that specification if a claim ever gets filed. Skip it and staining becomes permanent, and permanent means a board swap rather than a restoration.

There is the asymmetry. Ipe's maintenance buys appearance and can be deferred indefinitely. Composite's maintenance protects a warranty and cannot.

The Failure Modes Nobody Budgets For

Composite decking's real lifetime costs are concentrated in thermal movement, creep between joists, surface heat and scratch damage, and none of the four appear in a first cost comparison. These are the lines that turn a twenty five year plan into a fifteen year one.

Polymer expands and contracts with temperature far more than dense hardwood does. That movement is designed for through end gaps and specified fastener systems, and it is unforgiving of a crew that guessed. Gaps close in August. Boards buckle. On a dark colored composite in full sun, surface temperature climbs to the point where the deck becomes unusable barefoot on a summer afternoon, which is a functional failure on a pool deck even though nothing has broken.

Creep is the quieter one. Composite deflects between joists under sustained load, and the deflection does not fully recover. Twenty years in, a deck framed at 16 inches on center can read visibly wavy underfoot. Dense hardwood at the same spacing does not do this, and 16 inches on center is the working standard for Ipe and the other dense tropicals. The 2021 edition of the USDA Forest Products Laboratory Wood Handbook (FPL-GTR-282) is useful background on how these assemblies age in the field.

Scratch damage closes the loop. The cap is the product. Breach it and the board is finished, because there is no refinishing a coextruded surface. Ipe takes the same abuse and gives it back after a sanding.

The Substructure Is the Bucket Nobody Counts

A composite replacement at year twenty five almost always drags the framing along with it, which is why the replacement bucket is far larger than a second material quote. Owners who have lived through one tear off already know this, and owners who have not tend to find out with a change order in hand.

Picture the tear off. A crew removes the surface, and the joists underneath have been sitting in a wet environment for a quarter century. If that framing is pressure treated softwood, some percentage of it is going too, and now the job is a reframe rather than a re deck. On an elevated structure, add the project structural engineer's review, which is their determination to make rather than a lumber supplier's. Add the permit. Add the closure days on a restaurant terrace or a hotel pool deck where every closed day is revenue that does not come back.

An Ipe deck framed correctly does not reach that event inside the same window. Where owners do spec a hardwood substructure under a hardwood surface, the whole assembly ages on one clock instead of two, and the year twenty five conversation never happens.

The customers who come back to us fifteen years later are not calling about the boards. They are calling because they want to extend the deck and they want it to match. That is the tell. Nobody calls a supplier fifteen years out about a surface that failed, they just replace it and move on, and the second bill never shows up in the file where anyone would find it.

Norm Moton, Director of Sales, J. Gibson McIlvain

Elevated commercial decks carry their own structural requirements under the building code, which the project's structural engineer determines and which the International Code Council I-Codes set out in the model provisions most jurisdictions adopt. On a project where replacement means scaffolding or a crane, the surface's service life stops being a finish decision and becomes a capital planning one.

Fire, Code and Commercial Constraints That Change the Answer

Ipe carries an ASTM E84 Class A flame spread rating with no treatment, which on many commercial and multifamily projects removes composite from consideration before cost ever enters the discussion. Class A means a flame spread index of 25 or less.

That rating is intrinsic to the wood. Nothing is applied, nothing wears off, and nothing needs reapplying at year fifteen. Composite fire performance varies by formulation and has to be confirmed product by product against the manufacturer's evaluation report, and a product that meets the requirement in one assembly may not in another. On rooftop decks, on assembly occupancies and in wildland urban interface zones, this is frequently the controlling constraint. The National Fire Protection Association maintains the standards most of those requirements trace back to.

Accessibility governs the surface too. Commercial decks answer to the US Access Board's ADA standards on opening size, changes in level and slip resistance, and gapping details have to satisfy those rules while still allowing drainage and movement.

Documentation is the third constraint, and it is the one that delays jobs. FSC certified material is available in the tropical hardwoods and the Forest Stewardship Council chain of custody system is what makes that claim auditable, which matters on projects chasing LEED credits. When using a CITES-listed species, documentation is required at import and the paperwork belongs in the submittal package from day one rather than three weeks before delivery. Sort the chain of custody early. It is a scheduling problem, not a sourcing problem, and it is only a problem when someone leaves it late.

Where Composite Is Genuinely the Right Call

Composite is the better answer on short hold periods, on projects with no maintenance program at all, and anywhere the owner wants uniform color with zero involvement. Anyone who tells you otherwise is selling lumber rather than answering the question.

A merchant builder carrying a property for seven years is optimizing a different equation. First cost is the equation, and composite wins it cleanly. A rental portfolio with no facilities staff and no maintenance budget will get better outcomes from a surface that tolerates neglect than from a hardwood nobody will ever oil. An owner who cannot accept the silver gray patina and will not commit to an oiling schedule is going to be unhappy with Ipe in year three, and no supplier should sell into that.

Uniformity matters too. Ipe varies in color and figure since it grew rather than got extruded, and some clients read that variation as a defect. Show them boards before the order, not after.

The pattern is straightforward. Long hold periods, institutional owners, commercial traffic and any project where replacement is disruptive all point to Ipe. Short holds, no maintenance program and a need for absolute uniformity point to composite. There is no silver bullet species here, and there never was. A mediocre species installed well beats a premium species installed badly every time, and that ordering does not change no matter what goes on the joists.

How J. Gibson McIlvain Would Specify This

Specify Ipe when the hold period runs past fifteen years, when the deck carries commercial traffic, when a Class A rating is required, or when replacement means closing the space, and build the detailing to match the material's service life rather than the crew's schedule. Everything below is the execution detail a submittal reviewer will look for.

J. Gibson McIlvain stocks and mills Ipe decking in all standard and custom dimensions and ships it nationwide, including regular deliveries to California, out of a vast inventory held across the full dimensional range. That depth is what makes long clear runs possible on a commercial deck, and it is the reason the length conversation goes differently here than it does with a modified product capped at 16 feet.

Concrete guidance for the submittal:

• Moisture content. Specify 12 to 16 percent at delivery and acclimate on site before fastening. Boards installed wet will move.
• Joist spacing. 16 inches on center for dense tropical hardwood decking. Tighten it on stair treads and anywhere a diagonal pattern is used.
• Profile and fasteners. Tongue and groove if hidden fasteners are required, grooves down for drainage. Shiplap takes visible fasteners, and clip systems take clip specific grooved profiles rather than standard tongue and groove.
• Fastener metallurgy. 316 stainless within the coastal salt zone. Pre drill Ipe for face screws every time.
• Substructure. Match the framing's service life to the surface's. Furring strips or joists under every board, ventilation underneath, no direct contact with membrane or slab.
• Take off. A 5/4x6 covers about 2.1 linear feet per square foot. Order the waste factor honestly rather than optimistically.
• Documentation. FSC chain of custody and any required CITES paperwork lined up at the start of the schedule.

Ventilation is where good hardwood decks quietly separate from bad ones. Air has to move under the boards. A deck built tight to a membrane with no drainage plane will fail in a decade regardless of what species is on top, and the Building Science Corporation digest on drainage planes explains the physics better than any lumber supplier will.

For takeoffs, submittal support or a quote on Ipe decking, call J. Gibson McIlvain at 800-638-9100. The sales desk works with architects, contractors and commercial buyers on volume orders nationwide and will run the dimensional availability against your drawings before anything ships.