Gopher Wood & Waterproofing
Genesis names the wood used to build the Ark as gopher wood, then describes coating the vessel inside and outside with kopher. The identity of the timber remains uncertain, but the Hebrew wording opens several important possibilities.
The Hebrew Text / Genesis 6:14
Two Unusual Words in One Instruction
The Hebrew text uses a rare word for the timber and a related-sounding word for the substance used to coat the vessel. The distinction between the words is important: the wood is called gopher; the coating is called kopher.
“Wood of gopher … and you shall coat it inside and outside with kopher.” The precise English rendering of the final material is commonly “pitch,” while the verb describes coating, smearing, or sealing.
| Hebrew form | Transliteration | Use in Genesis 6:14 | What can be said |
|---|---|---|---|
| גֹּפֶר | gōpher | Wood used to build the Ark | A rare timber term found only here in the Hebrew Bible; its exact species or derivation is uncertain. |
| כָּפַר | kāphar | Verb: to coat or cover the Ark | The verb describes smearing, coating, or caulking the vessel. |
| כֹּפֶר | kōpher | Material used inside and outside | Commonly translated “pitch”; a protective coating or sealing substance. |
The NET Bible’s translation notes identify the verb as meaning “to cover” or “to smear,” with the practical sense of caulking, and note that the noun is rendered as pitch. The consonants כ־פ־ר (k-p-r) form a Hebrew root whose semantic range includes coating or covering and, in other contexts, atonement or ransom. In Genesis 6:14 the immediate sense is physical: the vessel is to be sealed with a protective substance. That wider root usage makes a covering association meaningful, but it does not by itself prove that גֹּפֶר derives from כֹּפֶר. The exact identity of gopher wood, by contrast, remains uncertain.
Possible Identifications / What Was Gopher?
Several Explanations Have Been Proposed
Because גֹּפֶר occurs only once in the Hebrew Bible, there is no second biblical passage that identifies the tree or clarifies its precise meaning. Translators and commentators have therefore approached it through botanical proposals, comparative language, and the earliest translations.
Cypress or another conifer
Cypress is a common modern translation, and other resin-bearing conifers such as pine or cedar have also been suggested. These woods have properties that can make them useful in construction and, in some cases, shipbuilding. The difficulty is that the Hebrew word itself does not securely identify any one species.
Resinous timber
Some translations and proposals emphasize resinous wood rather than a named species. This would describe a useful material characteristic—resin content or resistance to water—without claiming that the ancient word can be matched confidently to a modern botanical name.
Squared or dressed timber
The Septuagint renders the phrase with wording commonly translated “squared timber.” The Latin Vulgate uses a term meaning smoothed or dressed wood. These versions do not identify a tree species; they may preserve an early interpretation of the timber’s preparation or form.
Gopher and kopher
Some lexical discussions have considered whether gopher may be related to kopher, the coating material named later in the same verse. If the words are connected, the emphasis may be on resin, pitch, coating, or timber associated with waterproofing rather than a particular species.
A Linguistic Possibility / Gopher & Kopher
Could Gopher Be Connected with Covering?
The resemblance between gōpher (גֹּפֶר) and kōpher (כֹּפֶר) is striking, particularly because both occur in the same short instruction. The noun kōpher is associated with pitch or a coating material, while the verb kāphar describes the act of coating, smearing, or sealing.
Kaphar and kopher
The verb kāphar and noun kōpher belong to the same Hebrew word family in the coating instruction. The action and material are closely linked: the Ark is to be coated with the substance called kopher. In this immediate context, the physical sense is waterproofing and sealing.
Gopher and kopher
Gōpher begins with the Hebrew letter gimel (ג), while kōpher begins with kaf (כ). These represent different consonants, approximately voiced and unvoiced velar sounds. A relationship might involve an older or foreign form, a sound adaptation, or a textual history that is no longer recoverable. One lexicographical proposal is that an initial foreign sound may have fallen between gimel and kaf; a comparison has been made with variation in a probable Hittite loanword for “helmet” in 1 Samuel 17. That is an analogy for possible foreign-language adaptation, not proof that these two words are identical. It is not a regular Hebrew grammatical change that can simply be assumed.
One possibility is that gopher describes timber in a way connected with kopher—wood that was resinous, prepared, treated, or especially associated with a protective coating. On this reading, the emphasis may be less on identifying a modern tree species and more on the kind of material selected for a vessel that was to be sealed inside and outside. This is a plausible working hypothesis, not an established translation of the Hebrew noun.
A further comparative clue is the Akkadian word kupru or kupur, meaning pitch, noted in the Encyclopedia of the Bible. This makes a resin-and-pitch association linguistically interesting, but it does not by itself prove that Hebrew gopher and kopher are the same word. The proposed relationship is strengthened by the immediate context and the similarity of the forms, but it is not proved by them. The difference between gimel and kaf must remain visible in the discussion. A possible sound relationship should not be presented as a settled Hebrew sound law or as proof that the two nouns are identical.
Early Versions / Translation History
How Ancient Translators Understood the Timber
The early Greek and Latin versions are valuable because they show that the term was already difficult to interpret. The Septuagint renders the timber as squared wood, while the Vulgate describes it as smoothed or dressed timber. In the same verse, both versions translate the coating material as pitch or bitumen.
Squared timber
The Greek phrase ek xylōn tetragōnōn is commonly translated “from squared timbers.” This could reflect an interpretation of the wood as prepared structural beams rather than a botanical identification.
Smoothed or dressed timber
The Latin phrase de lignis laevigatis describes smoothed or dressed wood. The same verse uses bitumine for the coating material, preserving the distinction between the timber and the substance applied to it.
These early renderings do not settle the meaning of gopher. They do, however, demonstrate that the term was not consistently understood as the name of a particular tree. The possibility that the word describes a kind of prepared or specially suited timber deserves consideration alongside the botanical proposals.
Waterproofing / Kopher
Why the Coating Was Essential
Genesis does not merely say that the Ark was built from a particular timber. It also gives a specific instruction to coat the vessel both inside and outside. Whatever the exact composition of kopher, the stated purpose is clear: the wooden structure needed a protective, water-resistant seal.
In ancient Near Eastern settings, bitumen and other resinous materials were used for waterproofing. Tree resins, bituminous substances, and prepared mixtures are all relevant when considering what kind of coating may have been available. The text does not give a recipe or identify the precise source of the material, so a modern reconstruction should avoid treating one proposed mixture as certain.
Waterproofing would have involved the seams and joints as well as the broad surfaces of the hull. A coating could help limit water penetration, but a vessel of this size would also need strong structural connections to keep the planking from shifting and opening gaps as the hull flexed in waves.
The Ark could have been built from a particular species of wood and then sealed with a separate coating. It is also possible that the term gopher describes a timber valued for resinous or protective qualities. The text clearly names both the timber and the coating instruction; it does not explicitly tell us whether the two terms share an etymological origin.
The Ark Encounter’s modern hull discussion describes layered planking and interlocking joints as one way of addressing structural movement and waterproofing. Its reconstruction uses tree resin as its proposed coating material, but that remains its own reconstruction choice rather than a detail specified by Genesis.
Current Assessment / Open Question
What Can Be Concluded?
The precise species of gopher wood remains unknown. Cypress and other resinous woods are reasonable possibilities, but none can be established from the surviving Hebrew term alone.
- Clear from the text: the Ark was built from wood called gopher and was to be coated inside and outside with kopher.
- Strong linguistic evidence: the verb kaphar describes coating or smearing, and kopher names the coating material commonly translated as pitch.
- Early translation evidence: the Septuagint and Vulgate understood the timber in terms of squared or dressed wood, not a securely identified tree species.
- Plausible possibility: gopher may be connected with kopher in a way that points to resinous, prepared, treated, or coating-associated timber.
- Still uncertain: the precise botanical identity of the wood and the etymological relationship, if any, between gopher and kopher.
Among the proposals considered here, the covering-and-coating association is the one we find most plausible as a working explanation. It takes the immediate Hebrew context seriously and may point to resinous, prepared, or treated timber rather than a securely identifiable tree species. Even so, it remains a hypothesis: the Hebrew noun gopher is not simply translated as “covering,” and the proposed relationship with kopher has not been established. It should be weighed alongside the botanical and prepared-timber proposals, not treated as a settled solution.
Further reading: Encyclopedia of the Bible, “Gopher Wood” · NET Bible, Genesis 6:14 · Hebrew, Septuagint, and Vulgate text.