Is my damp solution right here?

I have a bungalow built on a hill. It has a block and timber (suspended on block work) foundation.

I can crawl around easily underneath. All is dry EXCEPT at the back where some water seeps through in very wet weather. This then causes smell of damp and condensation in one small bedroom.

My idea to overcome this is rather than try to add a concrete base to raise the level-hard to access etc-is to fix plastic sheeting beneath the wooden floor boards. So long as there are no gaps at then this would prevent damp getting into the room and condensation etc.
The area beneath the floor is vented and dries out and there is a distance of about 3 feet between the wet base area and the floorboards.
Any thoughts most appreciated....

 

I would be tempted to do it the other way around. That is fix your plastic as high up the wall as possible then just drape it down the wall and along over the earth, perhaps using a few bricks to hold it neatly at the bend. This is so the water stays on the "outside" of the plastic. To fix it upside down on the joists will mean you will need battens or temporary ones to hold it up as you fix it, and it will drape down over you as you do the work.
Frank

 

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