Short answer
Engineered wood siding is wood strand board bonded with resin and finished at the factory, so it costs less than fiber cement, weighs far less and cuts with ordinary carpentry tools. Fiber cement is a cement and cellulose board that will not swell when water reaches it and does not burn. On a Connecticut house the decision usually comes down to how carefully the wall is detailed, how exposed the site is, and how long you plan to own the home.
On this page
Both materials are sold to the same homeowner for the same reason: you want the look of painted wood lap siding without repainting the house every few years. They get there differently, and the difference shows up in water, fire, weight and price.
What each material actually is
Engineered wood
Engineered wood siding is manufactured from wood strands or fibers bonded with resins, treated against rot and insects, pressed into boards, and given a factory-applied overlay and finish. It behaves like lumber on the job site. A carpenter can cut it with a standard saw blade, it takes a nail without pre-drilling, and a long plank can be carried up a ladder by one person.
Because the substrate is wood, the performance of the product depends heavily on what happens at the cuts. Every field cut exposes an untreated edge that has to be sealed before it goes on the wall. That is not a manufacturer's suggestion buried in fine print; it is the main thing separating a wall that lasts from one that swells at the butt joints in eight years.
Fiber cement
Fiber cement is portland cement, sand and cellulose fiber formed into boards and cured. It is not food for insects, it does not rot, and it does not burn. It also weighs roughly two and a half times what an equivalent engineered wood plank weighs, which changes how it gets handled, cut and fastened.
Cutting fiber cement produces crystalline silica dust, so it is cut with shears or with a dust-collecting saw and the right respiratory protection. That is a real difference in how a job site runs. James Hardie is the fiber cement line we install, and the details on that product are on our siding page's fiber cement section.
Side by side
| Factor | Engineered wood | Fiber cement |
|---|---|---|
| FactorSubstrate | Engineered woodResin-bonded wood strands, treated | Fiber cementCement, sand and cellulose |
| FactorReaction to standing water | Engineered woodCan swell if the finish and cut ends are breached | Fiber cementDoes not swell or rot |
| FactorCombustibility | Engineered woodCombustible | Fiber cementNon-combustible |
| FactorWeight | Engineered woodLight, one-person handling on most planks | Fiber cementHeavy, two-person handling on long planks |
| FactorCutting | Engineered woodStandard woodworking tools | Fiber cementShears or dust-collecting saw, silica precautions |
| FactorField cut ends | Engineered woodMust be sealed, every time | Fiber cementPrimed cut edges recommended, less critical |
| FactorTypical installed cost | Engineered woodGenerally lands between vinyl and fiber cement | Fiber cement$18,000 to $80,000 or more in Connecticut, by house size |
| FactorMaintenance | Engineered woodRepaint on schedule, inspect joints | Fiber cementRepaint every 15 or more years |
Where the Connecticut climate actually matters
Freeze-thaw and wind-driven rain
Connecticut walls get wet and then get cold. Water that soaks into a wood-based edge and freezes expands, and the cycle repeats dozens of times a winter. Fiber cement is far less sensitive to that cycle because the substrate does not absorb and hold water the same way.
Every town we serve sits inside a designated hurricane-prone region under Appendix AY of the 2022 Connecticut State Building Code. Guilford, Madison and New Haven carry an ultimate design wind speed of 125 mph, higher than Greenwich, Stamford, Westport and Fairfield at 120 mph, because exposure to open water along the central shoreline drives the number rather than proximity to New York. Wind-driven rain is the practical consequence for siding. On an exposed Madison wall facing the Sound, the question is not which plank is prettier but which assembly keeps water moving back out.
Salt air
Along the shoreline, salt accelerates wear on wood and corrodes fasteners. Both of these materials outperform natural cedar there, but fastener selection matters as much as the siding. Stainless or hot-dipped galvanized nails are the spec, and a quote that does not name the fastener is leaving out the part that fails first.
Fire
Fiber cement is non-combustible. Engineered wood is not. On most detached houses with normal lot spacing, that is a comfort factor rather than a code requirement. On tight urban lots, on attached or closely spaced buildings, and on walls near a grill or an outdoor fireplace, it moves from preference to a real design consideration.
The honest case for engineered wood
Fiber cement is not automatically the right answer, and pretending otherwise would be sales talk.
- It costs less installed. Lighter material, faster cutting, fewer labor hours on tall walls.
- It is easier on complicated elevations. Gables, dormers, brackets and tight returns are quicker to detail in a material a carpenter can cut on a chop saw.
- It handles impact differently. Fiber cement can crack from a sharp blow; engineered wood tends to dent instead.
- It is lighter on marginal structure. On an older house with questionable framing or sheathing, weight is a legitimate factor.
If the installation crew is disciplined about sealing cuts and detailing joints, engineered wood is a defensible choice on a budget that cannot reach fiber cement. If the crew is not disciplined, the money saved is borrowed from year ten.
Warranties: read the proration schedule
Both categories advertise long warranty terms. The number on the brochure is not the useful information. Three questions are:
- Is the term prorated, and starting when? A long term that declines in value after a few years is a different product than one that does not.
- Is the finish warranty separate from the substrate warranty? It almost always is. James Hardie ColorPlus carries a 15-year finish warranty, and the board itself carries a 30-year non-prorated warranty. Those are two documents.
- What voids it? Installation outside the published instructions is the usual answer, which is why clearances to roofs, decks and grade are worth checking on the finished wall.
Permits and historic districts
Most Connecticut towns do not require a permit for a straightforward like-for-like siding replacement. A permit is generally required once the scope grows to exterior insulation, sheathing replacement, altered openings, or structural repair discovered after demolition, and that last one is common on older houses.
In a local historic district, Connecticut General Statutes Sec. 7-147f(a) draws the line at material type. Replacing like with like does not require a Certificate of Appropriateness. Switching from wood clapboard to either engineered wood or fiber cement is a change of material type and does. That means a commission meeting on the calendar, so find out before you set a start date.
Which one we would put on which house
Our siding list is vinyl, James Hardie fiber cement and cedar, and we are a James Hardie Elite Preferred contractor. You should weigh this comparison knowing that. What we would say regardless of who installs it:
- Exposed shoreline wall, long ownership horizon: fiber cement, with stainless fasteners and generous clearances.
- Complex gable-heavy elevation on a tight budget: engineered wood is reasonable if the cut-sealing is specified in the contract.
- Tight urban lot or attached structure: the non-combustible option.
- Rental or a house you expect to sell within a few years: compare both against premium vinyl before spending the difference. Our James Hardie versus vinyl comparison covers that trade honestly.
What the number depends on
Wall area, trim complexity, story height and what is behind the old siding move the price more than the material choice does. Published Connecticut ranges put James Hardie at $18,000 to $80,000 or more depending on the house. Engineered wood generally sits between vinyl and fiber cement, but we do not publish a range for a product we do not install, and you should be skeptical of anyone who quotes one before measuring your house.
The rest of our siding material and process detail is on the siding service page. When you are ready for a real number, request an estimate and someone comes out, measures the elevations, looks at the condition behind the existing siding where possible, and gives you a written price. It is a sales appointment, and the written scope is what you should judge it by.
