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Posted: Sun Jan 26, 2014 12:54 pm hi hoping someone can help or give some advice. We are wanting to knock through to a downstairs extension. We are making an opening of 2.5 meters, in a brick and breeze block outside supporting wall. the wall width including brick, breeze block and...

hi hoping someone can help or give some advice. We are wanting to knock through to a downstairs extension. We are making an opening of 2.5 meters, in a brick and breeze block outside wall. the wall width including brick, breeze block and cavity is 250mm. What size rsj is required. Many thanks