Damp concrete floor beneath timber garage

[Bad Panda]

Hi,
I have a new timber garage behind my house, built over the summer on a new concrete floor. The floor was laid around 6 inches thick on the rubble left from the old garage. There was no membrane installed below or on top of the floor and I am seeing damp rising up the back half of the concrete floor when it rains heavily.
I'm not worried about having a damp floor inside the garage as everything is stored on the walls or on plastic shelving. However, I am worried the timber at the bottom of the walls, and eventually the walls themselves, will absorb the damp and rot.
Does anyone have any advice on whether there is a reasonably low cost way of ensuring the timber walls do not hold the moisture? Bearing in mind the garage itself is very heavy it would be ideal if there was a solution that could be injected into the sides of the concrete slab. Also, there is exposed soil to the back of the slab. Would it be advsiable to pave this area to ensure this ground doesn't get waterlogged?
Thanks in advance.

[Simon Site Manager]

Hi Panda,

Without major remedial work I think you are stuck with it. You could try digging out round the slab and installing some Aco running it off to a SW drain.

Simon

[ultimatehandyman]

You could wait until the slab is dry and then inject some damp proofing cream, that should stop the damp from rising up. You only need to inject it where the timber is and not all the base.

You can buy just one tube and test it to see if it works

[Bad Panda]

You could wait until the slab is dry and then inject some damp proofing cream, that should stop the damp from rising up. You only need to inject it where the timber is and not all the base.

You can buy just one tube and test it to see if it works

Thank you both. I'll give the damp proof cream a go and see if that works, though it may be awhile before the rain holds off long enough!

Thanks again.