Water seeping along downpipe

Water seeping along downpipe

Water seeping along downpipe

I've laid down a rubber roof for a shed and water-tightened this downpipe that goes through the shed (via its roof). Here are some pictures of that in case it's relevant:

I've also done two other soil pipes too. All of these were fine for the first two weeks and we had some rain over these two weeks but the above has now failed. Water is seeping through and I can feel it along the pipe inside the shed.

I have noticed that there is water seeping out of...

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by Jupiter01

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