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(1) The assessment of the mechanical properties of old timber is essential for the proper maintenance of wooden structures. (2) Among the non-destructive properties, the dynamic modulus of elasticity is one of the best predictors of the mechanical characteristics of the members, but it requires the determination of wood density to be determined. (3) Thus, wood density was estimated by drilling resistance measurements, developing species-specific prediction equations for silver fir, chestnut and poplar. (4) The estimated density was combined with the stress wave velocity propagating longitudinally through the wooden piece, and the dynamic modulus of elasticity was calculated. (5) Medium-high coefficient determinations (R2 from 0.79 to 0.94) were found for density estimation, and medium coefficient determinations (R2 from 0.53 to 0.60) were found for the estimation of the static modulus of elasticity using the dynamic modulus.

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Most World Heritage Sites in the Maghreb region are threatened by numerous natural and anthropic hazards, the latter usually due to complex economic, social and cultural dynamics. Because of changes in ways of life and housing models, traditional building cultures are often not recognised by inhabitants as heritage and are becoming unable to resist the spread of modern standardised technologies. These changes put at risk the conservation status and consequently the Outstanding Universal Value of the sites. The World Heritage Site of the M'Zab Valley in Algerian desert is a rare example of the preservation of both tangible and intangible dimensions of heritage and their transmission to new generations through the construction of the new settlement of Tafilalt, built interpreting the traditional techniques. The contribution analyses the case of the M'Zab Valley in order to show the role of community involvement in safeguarding the authenticity and integrity of this World Heritage Site.

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