The Science Behind Maine Cedar: Why It’s One of the Best Materials for Fences and Decks
When choosing materials for a fence or deck in Maine, durability isn’t optional — it’s essential. Between heavy snowfall, spring moisture, coastal air, and repeated freeze-thaw cycles, outdoor structures in Southern Maine face significant environmental stress.
One material consistently performs above the rest: cedar — particularly locally sourced Maine cedar.
Here’s why.
Natural Chemical Defense: Why Cedar Resists Rot and Insects
Cedar contains naturally occurring compounds called extractives — organic chemicals stored in the heartwood of the tree. These include phenols and thujaplicins, which act as natural fungicides and insect deterrents.
Unlike pressure-treated lumber, which relies on chemical infusion, cedar’s resistance is built into its cellular structure.
These natural compounds:
Inhibit fungal growth that causes rot
Deter termites and other wood-boring insects
Slow moisture absorption
This is why cedar performs so well in damp and variable climates like Maine’s.
Dimensional Stability in Freeze-Thaw Conditions
One of the most destructive forces in Maine is the freeze-thaw cycle. When water penetrates wood and freezes, it expands approximately 9% in volume. Repeated expansion and contraction cause internal stress that leads to cracking and splitting.
Cedar has:
A lower density than many hardwoods
Straight, uniform grain structure
Reduced shrinkage coefficient compared to other softwoods
Because of this, cedar expands and contracts more evenly and is less prone to severe warping or structural distortion over time.
This dimensional stability is critical for:
Fence panels staying aligned
Deck boards maintaining tight spacing
Structural integrity of posts and framing
Moisture Performance and Cellular Structure
Wood is hygroscopic — meaning it absorbs and releases moisture based on surrounding humidity. Excessive moisture absorption is the primary cause of decay in most lumber.
Cedar’s cellular structure contains natural air pockets and oils that slow moisture transfer. While no wood is waterproof, cedar:
Absorbs water more slowly than many species
Dries more efficiently
Resists internal breakdown longer
This makes it particularly well-suited for Maine’s humid summers and wet springs.
Strength-to-Weight Ratio
Cedar offers an excellent strength-to-weight ratio. It is lighter than many comparable lumber types, which reduces structural stress while maintaining durability.
For fencing and decking, this means:
Easier precision installation
Reduced strain on fasteners and hardware
Long-term structural reliability
Proper installation combined with cedar’s physical properties results in longer-lasting builds.
Thermal Performance
Cedar also has natural insulating properties due to its low density and air-filled cellular composition. While insulation may not be a primary concern in fencing, thermal stability reduces the expansion and contraction extremes seen in some composite and metal materials.
This contributes to long-term dimensional stability in outdoor applications.
Aesthetic Longevity
Cedar’s natural oils not only protect it structurally but also preserve its visual appeal. Fresh cedar features warm reddish and honey tones. When left untreated, it gradually weathers into a uniform silver-gray patina — a look many Maine homeowners prefer.
Unlike some materials that degrade unevenly, cedar ages with character rather than failure.
Sustainability and Local Sourcing
Locally harvested Maine cedar reduces transportation emissions and supports regional forestry operations. Cedar is renewable, biodegradable, and responsibly harvested when sourced properly.
Using materials suited to the region they grow in is both environmentally responsible and structurally practical.
Why Cedar Performs So Well in Southern Maine
Cedar’s:
Natural rot resistance
Insect deterrence
Dimensional stability
Moisture management
Strength-to-weight efficiency
make it uniquely well-suited for Maine’s demanding climate.
When properly installed and maintained, a cedar fence or deck can provide decades of performance while maintaining natural beauty.
Contact 207 Fence for Cedar Fence & Deck Installation in Southern Maine
If you’re considering a cedar fence, deck, pergola, or custom outdoor project in Greater Portland or Southern Maine, 207 Fence delivers expert craftsmanship built for Maine’s conditions.
Contact us today to schedule a consultation or request a free estimate. Our team is ready to help you choose the right materials and build something designed to last.
