Pine Tar Tjære Immersion & Tiered Roof Dragon Finials: Wood Preservation, Shingle Shingling & Viking Gable Crests

Across the misty mountain fjords of Norway, the quintessential sensory experience of visiting a medieval stave church is its intoxicating, leathery aroma of woodsmoke and sweet resin. This scent emanates from the monumental coating that protects every exterior shingle, beam, and carved finial: milebrent furutjære (kiln-burned pine tar). In an environment that experiences over two hundred days of rain and snow annually, timber cannot survive on structural merit alone; it requires continuous biochemical protection.

Authentic pine tar is not an industrial byproduct; it is the precious extract of ancient forestry science. Woodsmen harvest the stumps and major root systems of old-growth Scots pine (tyri) that have seasoned in peat bogs or rocky clearings for decades after the tree was felled. In the forest, artisans construct a tjæremile (earthen tar kiln)—a massive conical mound stacked with split pine splints over a clay-lined funnel basin. Covered in moss and turf, the kiln is fired under slow, oxygen-starved pyrolysis for two full days. As the resinous wood chars without burning, pure golden pine tar sweats from the fibers and drains into collection barrels, producing the ultimate natural wood preservative known to humanity.

The technical brilliance of traditional pine tar lies in its chemical compatibility with wood. Modern petrochemical varnishes, alkyd paints, and acrylic coatings form an impermeable plastic film across timber surfaces. In harsh climates, microscopic fissures inevitably develop in the paint film; liquid rainwater enters these cracks, becomes trapped behind the impermeable plastic layer, and accelerates catastrophic fungal decay.

Pine tar functions on the opposite principle: it is an organic, vapor-permeable penetrant. Compounded naturally of abietic acids, phenolic derivatives, and terpenes, the tar penetrates several millimetres deep into the cellular structure of the Scots pine heartwood. Acting as a natural fungicide and biocide, it kills rot spores and repels wood-boring insects. Crucially, pine tar never seals the wood pores completely: it creates a hydrophobic barrier that sheds liquid rainwater while allowing the timber to transpire internal water vapor freely, ensuring the wood remains permanently dry and sound.

The architectural envelope that receives this pine tar is the breathtaking shingle cladding of the stave church’s tiered roofs. Known as takspon, these wooden tiles are not sawn with mechanical blades; they are split by hand along the natural radial grain lines of Scots pine heartwood logs using specialized froes (klyvkniver) and wooden mallets. By following the natural grain of the wood, hand-splitting preserves the unbroken cellular walls of the fibers, ensuring that water cannot penetrate through sheared end-grain capillaries.

Craftsmen shape the exposed lower end of each shingle into a rounded "beaver-tail" or pointed diamond profile. The shingles are laid over horizontal timber battens in a dense, three-ply overlapping pattern, fastened with hand-forged copper nails. From a distance, this multi-tiered cascade of pointed, tar-blackened shingles resembles the overlapping scales of a mythical dragon—an architectural armor that flexes with the building while shedding cascading snowdrifts clear of the church foundation.

Crowning the soaring gables and ridge crests of the highest roof tiers are the most dramatic sculptural elements of Nordic architecture: the dragehoder (dragon heads). Carved from massive blocks of dense Scots pine heartwood, these mythical serpentine beasts snarl into the mountain skies with flared nostrils, gaping jaws, and curling crest tongues, directly evoking the carved prow stems of Viking warships that once terrorized the coastlines of medieval Europe.

While these dragon heads served an ancient spiritual role—functioning as apotropaic guardians intended to deflect malevolent winter spirits, lightning strikes, and demons from the Christian altar within—they also perform an ingenious aerodynamic function. At the narrow, soaring apex of the gable ridge, wind currents collide to create powerful uplift vortices that can rip roof shingles from their battens. The projecting snout, open jaw, and pierced comb of the dragon finial act as natural aerodynamic spoilers, breaking high-velocity wind gusts into gentle turbulence eddies, protecting the integrity of these timber cathedrals through the fiercest Nordic storms.