The main different between internal lintels and external lintels is the thermal brake in the external lintel. A piece of insulation running through in the lintels between the two-concrete part, what is helps to avoid of any coldbridge. Available sizes (length): 1m, 1.25m, 1.5m, 1.75m, 2m, 2.25m, 2.5m. Every lintel needs 150mm bearing each side. For example: 1m lintel need 300mm bearing, so it is suitable for 700mm or smaller openings.
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