Málmur
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Fá efni endast að eilífu, en að vera viðhaldsfrítt getur þá frekar þýtt að viðhald sé ekki mögulegt. Efnið verður því að endurnýja þegar viðhald er nauðsynlegt eða efnið verður ónýtt.
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Veggir Borgarbókasafnsins við Tryggvagötu eru úr járnbentri steinsteypu og hafa líklega verið múraðir en síðan hefur byggingin farið í gegnum nokkrar breytingar. Árið 1997 var gluggasetningu hússins breytt og það einangrað og klætt að utan með lituðum stálplötum.
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Viðhaldsfrí byggingarefni voru mikið auglýst í lok síðustu aldar og byrjun þeirrar tuttugustu. Það má spyrja hvort byggingarefni geti yfir höfuð verið viðhaldsfrí.
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Álskildirnir gefa húsinu blæ léttleika og ákveðna hrynjandi. Skildirnir eru sérhannaðir og smíðaðir í Japan. Neðstu hæð hússins má líkja við pall sem hinn rauði hluti hússins rís upp af.
Manfreð Vilhjálmsson, Þjóðarbókhlaðan, Ritmennt 1.tölubl. 1999 ![](https://freight.cargo.site/t/original/i/8b611d0834d673f3a4b01bd1298b65b2558b99889eac8e9588f01919687a8792/_DSC3423.jpg)
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