Making old garage watertight

[Maceoid]

My garage (an old livestock shed) is about 30 years old. Two exterior walls are single brick, rendered and whitewashed on the outside, bare brick inside. Roof is great - not a drip comes through. Floor is concrete. Door is brand new, up-and-over, watertight.

Remaining wall is breeze blocks that have just been whitewashed - no render or other covering inside or out.

Problem is, inside there's damp patches on the floor all around the edge at the bottom of each wall. In heavy rain, shallow puddles form.

I'd like to convert it into a gym/workshop.

Is there an easy way to waterproof the brick/floor inside? Some sort of paint? Should I render the breeze blocks inside and out too?

Scratching my head on this one. Any help much appreciated.

 

[Deluks]

I think the most effective option would be to install adequate drainage on the outside of the walls. Does water pool up against the building when it rains?

 

[Maceoid]

Not really any 'pooling' around it - although there is a small raised bank of earth (an old veg plot I think) on the back wall which I was going to remove, leaving the wall clear...good idea?

 

[Fluffster]

Def a good Idea to remove the earth. If you cannot stop the mositure penetrating at source next best thing is to repel it.
Water resistant soloutions can be painted on the breese blocks and main external wall.
Pitch black a liquid bitumen is good if painted on blocks but you will still need somewhere for the retained water to exit poss via drain holes.
Pete