water ingress on floor of pre-cast concrete shed.

[gordon34]

I am seeking advice on ways to stop rain seeping onto the floor of a precast concrete shed.
The shed sits on a concrete base and during winter especially much of the floor gets very wet. My guess is that rain seeps in where the walls meet the floor.
I have considered sticking roofing felt around the external junction of the shed and its base, say about 6 inches on the precast concrete wall and the same width on the concrete base. However, I know I will have extreme difficulty getting around two sides of the shed because of the proximity of the shed to two fences. I also am unsure if rain that gets onto any of the base I do not cover will seep in under the roofing felt.
Any suggestions please?

 

[noseall]

This subject has been discussed many times on here and it is one of my gripes.

A search should throw up a few answers.

 

[Norcon]

That's one of the inherent problems with precast sections. Difficult to seal and overall provides a weak structure!