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We haven't screeded yet, not sure about the insulation. Is carrying out this work possible or is it going to create more problems ?

He wants three vents piping into the existing house. Is the only way to cut into the concrete base. Yes it is very late which is why it is very frustrating when plans have been approved without it being mentioned and two previous inspections carried out without it being mentioned, and thats...

What depth does the pipe need to be ?

Thanks. Daft question but can you ventilate into the extension as the base is lower than house floor ?

Thanks, can I ventilate from the side as the concrete base from the extension is already laid. If so how many points of ventillation ?

The floor in the existing house is suspended wooden floor, and was built in 1930,s. As far as I am aware the original building has a DPC. The extension is across the width of the house (approx 3x5.7m) and does not have a void under the flloor. I am from South Yorkshire.

I am currently in the process of building an extension. The base is concrete. Following an building inspection it has been identified that there is no under floor ventilation to the already existing house. The ventilation was not on the plans, other inspection from building controls at various...