{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T10:55:21Z","timestamp":1775645721292,"version":"3.50.1"},"reference-count":21,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T00:00:00Z","timestamp":1775606400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Council for Scientific and Technological Development\u2014Brazil","award":["150581\/2025-4"],"award-info":[{"award-number":["150581\/2025-4"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>This work experimentally evaluates the geometry-driven structural efficiency and normative performance of sandwich-type composite roofing tiles composed of a miriti wood core and fiberglass-reinforced polymer faces. Trapezoidal-profile tiles were manufactured by hand lay-up and assessed according to ABNT NBR 16753, including visual inspection, fiber content, water absorption, apparent flexural behavior, deformation resistance, and impact resistance. The miriti core exhibited an extremely low mean density of 0.091 \u00b1 0.008 g\/cm3 (CV \u2248 8.8%), enabling lightweight sandwich configurations with an average overall thickness of approximately 8 mm. Fiberglass contents ranged from 27.5% to 32.1% by mass. Sealed sandwich specimens showed median water uptake values of approximately 2.5% after 2 h and 6.0% after 24 h immersion. Deformation resistance tests indicated admissible deflections of 15.0\u201315.75 mm (L\/40), supported by applied masses between 39.6 and 104.3 kg (\u2248388\u20131023 N) without rupture or permanent damage. Apparent flexural stresses ranged from 6.7 to 9.3 MPa, with apparent moduli between 0.7 and 1.9 GPa. All tiles achieved 100% approval in deformation, impact (2\u20138 J), and visual criteria. The results demonstrate that geometric effects dominate structural performance, validating miriti wood as an efficient and sustainable core for normatively compliant composite roofing systems.<\/jats:p>","DOI":"10.3390\/polym18080907","type":"journal-article","created":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T09:49:44Z","timestamp":1775641784000},"page":"907","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Geometry-Driven Structural Efficiency and Normative Performance of Miriti-Based Sandwich Composite Roofing Tiles"],"prefix":"10.3390","volume":"18","author":[{"given":"Ana C\u00e9lia Sousa da","family":"Silva","sequence":"first","affiliation":[{"name":"Materials Engineering Program, Federal Institute of Education, Science and Technology of Par\u00e1\u2014IFPA, Avenida Almirante Barroso, 1155, Marco, Bel\u00e9m 66093-020, PA, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1878-6609","authenticated-orcid":false,"given":"Maur\u00edcio Maia","family":"Ribeiro","sequence":"additional","affiliation":[{"name":"Federal Institute of Education, Science and Technology of Par\u00e1\u2014IFPA, Estrada do Icu\u00ed Guajar\u00e1, Ananindeua 67125-000, PA, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3897-8381","authenticated-orcid":false,"given":"Douglas Santos","family":"Silva","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering\u2014IME, Pra\u00e7a General Tib\u00farcio, 80, Praia Vermelha, Urca, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0959-0759","authenticated-orcid":false,"given":"Ra\u00ed Felipe Pereira","family":"Junio","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering\u2014IME, Pra\u00e7a General Tib\u00farcio, 80, Praia Vermelha, Urca, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1208-1234","authenticated-orcid":false,"given":"Sergio Neves","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Department of Materials Science, Military Institute of Engineering\u2014IME, Pra\u00e7a General Tib\u00farcio, 80, Praia Vermelha, Urca, Rio de Janeiro 22290-270, RJ, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9256-4564","authenticated-orcid":false,"given":"Jean da Silva","family":"Rodrigues","sequence":"additional","affiliation":[{"name":"Materials Engineering Program, Federal Institute of Education, Science and Technology of Par\u00e1\u2014IFPA, Avenida Almirante Barroso, 1155, Marco, Bel\u00e9m 66093-020, PA, Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2200258","DOI":"10.1002\/adsu.202200258","article-title":"Sustainable Fiber-Reinforced Composites: A Review","volume":"6","author":"Maiti","year":"2022","journal-title":"Adv. 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