DPC over L10 Lintel?

28 Apr 2014
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United Kingdom
I am installing Galvanised L10 L-shaped lintels above my windows as the outer leaf was originally just supported by the timber window frames. ( I now understand this is quite common in older houses)

My question is do I need a dpc over the lintel?
Do I bridge the cavity with it, I.e taking out half the mortar from an internal course and mortaring in a dpc?

If so would this be suitable? http://www.screwfix.com/p/damp-proof-course-450mm-x-30m/55072

Should I put a bed of mortar on the lintel,then dpc, then mortar and then brick?

The house has 250mm cavity walls with cavity wall insulation installed. Not sure if any of that makes a difference.

Thanks in advance.
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If it's a galvanized lintel, you still need a flexible dpc over it.

DPC directly on lintel (ie without mortar), then mortar + brick. Leave a weep hole or two for drainage.

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