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We have started painting the garage and found that this garage was poorly converted from a carport by the previous owner. After heavy rainfall (Cyclone Alfred) , water ingress occurs, and some water pools on the floor near the wall. However, the issue is not very serious.
Please see the attached interior and exterior images.
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We are considering the possible sources of the leak:
1. The fence is screwed into these boards, and water may be seeping through the screw holes.
2. The exterior paint has peeled off, leaving the boards exposed to moisture.
3. Hairline cracks in the exterior paint may be allowing water to penetrate.
4. Water is collecting on the window rail. (We already sealed the edges of the window on all four sides a long time ago.)
We understand that the most effective solution would be to demolish the garage and revert it back to a carport, but we simply cannot afford that.
Is there any DIY solution we can try to fix this issue?
