On 23/01/2020 15:35, Anna Bonaddio wrote:


here are some pics - sorry worked out how to do it now!

https://www.flickr.com/photos/186594924@N02/



That brick paving is not waterproof. Water will run through the gaps
between each of the bricks. The gap has probably just been filled with sand.

The metal water drainage gully to the front of the second photo will
only deal with surface water and not any water that has gone down the
gaps between the brick paving.

This means that the layer beneath the brick paving is the bit that needs
to be totally waterproof AND with a means of directing any water that
gets through the bricks to a drain. On the road side the tarmac
pavement is higher than the bottom of your brick paving so the water
cannot escape that way. I see no gutter or downpipe for water in any of
your other photos. I would expected that roof to slope slightly so the
water drains to one end and for there to be an opening to a downpipe to
drain the water away from the roof.

My guess is that the developer hasn't installed a sufficient waterproof
layer under the brick paving, or has installed a layer that is not
robust enough for the intended traffic (the weight of a couple of parked
cars) and the layer has failed and/or the roof doesn't slope
sufficiently for the water to drain to a common point. Every time it
rains you could have a large pool of water under your brick paving that
is probably seeping through any cracks in any waterproof layer and
making the plywood outhouse roof and block walls wet.

If the wooden beams and plywood are the only support for the roof then
now being wet is likly to make the problem worse every time you or you
neighbour parks a car and the wet ply and wood flexes.

Put a spirit level on your brick paving. Is it level or is there a slope?

I doubt if it is condensation.

When the developer later installed the lead flashing was this flush with
the top of the brick paving, was it fitted below the the brick paving or
was it fitted beneath the waterproof layer? If the two former cases it
could have made the problem worse.

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