Issues with new build down pipes backing up at the eaves.

Discuss renovating, DIY, projects, trades and all things related to renovating houses in Australia.
Anyone help with what this could be?
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Welcome to r/medical_advice! Advice given on this sub does not constitute professional medical advice. The circumstances do not mimic those of a review by a health professional. Advice is therefore meant for interest only, in an unofficial capacity, or to help point you in the right direction. Assessment, diagnosis and treatment recommendations are not possible, and all suggestions as such are speculative opinions.Can’t buy PPV through the UFC app.

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