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second storey extension

Posted: Tue Apr 12, 2011 1:31 pm
by jbw550
Hi, i currently have an exsistiing extension on the back of my house it is 16ft by 7ft.
i want to build up on it, what is the best way to take it up, will i need aerated blocks for the external wall? or would i use them for the internal?????

any suggestions would be a massive help