Lintels, What oen do I need?

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Devon
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United Kingdom
What type of lintel should be used over a ground floor doorway in to two story solid brick pre 30s rendered wall? Standard door opening 80mm wide.
Concrete, or steel, some one of the other metal shaped ones, then what size lintel would you recommend.
I ask because the builder waffled on about not being able to put in steel because it causes concrete cancer, though how this is relevant in a brick wall has been confused. Also, as far as I'm aware, concrete cancer was caused by the sea salts not being washed from dredged gravel.
I presume padstones should be used, or are these just for steel?
 
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Your builder seems a bit clueless, is he a proper builder? Concrete lintels have steel in them tell him!

You can use steel or concrete. Concrete will be a lot cheaper. No padstone required
 
Agree with Woody - concrete would be the cheaper option, assume 150mm bearing each side - assuming your doorway is actually 800mm not 80mm then your looking at about an 1100 - your merchants may only sell 1050 or 1200 which you can cut down
 
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When I hear any 'tradesman' start to waffle on it sets alarm bells ringing. He went on about more than concrete cancer and I might not know everything about construction, but I do know a bit. So goodbye builder.
 

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