Controle de qualidade de madeiras da região amazônica

Chimelo, João Peres

doi:10.1590/s0102-33061988000300005

Cited by 4 publications

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Against the grain: environmental laws, local botanical knowledge, and housing access in Rio de Janeiro

Lesser

Brandes

2023

J Environ Stud Sci

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This article considers how the construction practices of marginalized communities in Rio de Janeiro link the provision of essential housing to distant forest environments and markets for wood building materials. As elsewhere in Brazil, many families without access to real estate markets have built their own homes using locally available materials, a right protected by the 1988 Constitution and federal law. Today, these houses are typically built from reinforced concrete and clay bricks and finished with a roof of clay tile or cheaper fiber-cement corrugate. Production and sale of fiber-cement, which contains asbestos, were restricted by Rio de Janeiro State law in 2001 and ruled unconstitutional by Brazil’s Supreme Court in 2017. But little attention has been given to the human and environmental health effects of other building materials. This article examines the timber frame to which roof tiles are affixed. Maçaranduba is the main wood used in roof construction and is the most traded wood in Brazil, with production practices linked to environmental and social violence. Brazil’s laws presently subsidize plantation-grown pine and eucalyptus as “sustainable” alternatives to native hardwoods. The chemical treatments commonly applied to render these woods resistant to decay, however, contain potent environmental toxins. Moreover, the degree to which builders of essential housing actually use these products is unstudied. We argue that legislation has moved “against the grain” or without close attention to the botanical knowledge expressed in vernacular architectures and the needs of marginalized socio-ecologies intimately linked through the production of essential housing.

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Against the grain: environmental laws, local botanical knowledge, and housing access in Rio de Janeiro

Lesser

Brandes

2023

J Environ Stud Sci

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Evaluation of the Durability of Imported Woods Used for Domestic Wood Decking

2023

J. Agirc. Life Sci.

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Natural durability and improved resistance of 20 Amazonian wood species after 30 years in ground contact

Gouveia¹,

Silveira²,

Garlet³

2021

Holzforschung

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This study aimed to assess the natural durability of 20 Amazonian wood species preserved with chromated copper arsenate (CCA) after 30 years in ground contact in an experimental field test at National Forest of Tapajós, Pará state - Brazil. Heartwood samples with a cross-section of 5 × 5 cm and 50 cm of length were half-buried in soil and inspected every year for decay. The species were classified according to natural durability following the classification method proposed by Findlay (Findlay, W.P.K. (1985). The nature and durability of wood. In: Findlay, W.P.K. (Ed.), Preservation of timber in the tropics. Springer Science, Whitchurch, pp. 1–13). After 30 years in ground test, six species were classified as Perishable, seven as Non-durable, three as Durable and four as Very durable, namely: Trichilia lecointei, Lecythis pisonis, Pseudopiptadenia suaveolens, and Dipteryx odorata (Very durable), Protium tenuifolium, Dinizia excelsa, and Ormosia paraensis (Durable), Endopleura uchi, Goupia glabra, Pouteria egregia, Tachigali chrysophylla, Tachigali paraensis, Vatairea sericea, and Vochysia maxima (Non-durable) and Chrysophyllum lucentifolium, Couratari oblongifolia, Didymopanax morototoni, Lueheopsis duckeana, Sterculia excelsa, and Xylopia nitida (Perishable). CCA preservative treatment was effective to promote timber protection, even under harsh climatic conditions of the Amazon forest environment.

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Controle de qualidade de madeiras da região amazônica

Cited by 4 publications

References 0 publications

Against the grain: environmental laws, local botanical knowledge, and housing access in Rio de Janeiro

Against the grain: environmental laws, local botanical knowledge, and housing access in Rio de Janeiro

Evaluation of the Durability of Imported Woods Used for Domestic Wood Decking

Natural durability and improved resistance of 20 Amazonian wood species after 30 years in ground contact

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