Ma­te­rial facts

Period Living - - Maintenance -

Early me­tal win­dows were made out of wrought iron by black­smiths, and were ex­pen­sive to pro­duce. Steel is now the dom­i­nant ma­te­rial, with mod­ern win­dows de­signed to be en­ergy ef­fi­cient and cor­ro­sion re­sis­tant.

Wrought iron: Rel­a­tively durable, early wrought-iron frames and case­ments were usu­ally made of flat sec­tions, but this meant that they of­ten pro­vided lit­tle re­sis­tance to wind-driven rain.

Cast iron: Used from the mid 18th cen­tury, cast iron was rea­son­ably re­sis­tant to cor­ro­sion but it was brit­tle.

steel: In the 19th cen­tury, the in­tro­duc­tion of mass-pro­duced rolled steel en­abled pre­cise and more com­plex sec­tions to be formed. This meant man­u­fac­tur­ers, like dom­i­nant Crit­tall, could pro­duce bet­ter-seal­ing case­ments.

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