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Here's a picture from above. Total thickness of the board is approx 12mm with the white middle bit being about 6 to 7mm. The steam is meant to be vented vertically outside. But the fan was not very powerful and there was no condensation trap meaning the water would drip back down. The house...

I'm replacing an old bathroom extractor fan and am wondering what kind of plasterboard this is. The bottom layer (brown) is almost sand like, you can rub it away with the finger. Any comments are greatly appreciated. Thanks Ps It's a 1930s bungalow