DIY Doctor

Joining to existing footings

Postby TURNWISE » Mon Jul 20, 2009 8:23 am

I am building a new conservatory. One wall of the conservatory will be 2.1m high and will be tied to an the external wall of the house. The other walls will be 600mm high.
The 2.1 high wall already has footings, as when the house was built the builders erected a garden perimeter wall.
We intend to reuse these foundations to build our 2.1m wall on but need new strip foundations for the other two walls of the conservatory.

My question is do I need to join these new strip foundations to the existing or is a simple butt joint enough.

The construction is exempt from building regs but I want it done correctly.

Please help
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Simply Build It

Postby stoneyboy » Sun Jul 26, 2009 4:36 pm

Butt join your foundations and use concrete blocks below ground level ensuring that a complete block bridges the join.
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Postby uk's best builder » Wed Sep 16, 2009 3:29 pm

when butting up to old foundations you should apply a slip membrain
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