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It should be that there is a problem on the roof, first go to the property, let the property check the cause on the roof, and do waterproofing.
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Roof leakage can be made of waterproof polypropylene or waterproof membrane.
Be careful of this danger. Recommendations:
1. Find a property to copy the structure of your house (not the architectural drawing); >>>More
Put some greenery in the window of the second bedroom and you can dissolve it.
Summary. The larger the exhaust airflow, the better. It is recommended that you buy a range hood with an exhaust air volume of more than 20 cubic meters. >>>More
Clean the house and buy rat traps and rat poison for yourself and your family to stay safe.
Suggestion: first find a professional dredge to dredge the lower pipe, and then replace the floor drain with a T-shaped one, so that there will be no backwater. Hope it helps.