Damp blown screed?

[Sythur]

Hi All,

Would anybody mind casting an eye over this and letting me know if im thinking along the right lines?

Ive recently moved into my first house and the screed floor in a small extension (less than a couple years old) has lifted and cracked all over.

I thought it might be damp or condensation from ontop of the slab underneath as ive found a couple signs of slight water damage on one edge of laminate flooring where the old front room meets the edge of the extension.

Had a poke around and the extension back wall has a double layer of damp course 3 bricks apart (possible because my garden in on a steep slope?).
The first layer was compleately supmerged under damp muddy pea shingle used in a 8inch gap between a patio and the wall and the bricks look wet. This looks to me like it would be just under the floor level letting moisture in, while the upper layer of damp course has protected the walls.

Im digging it all out below the membrane to see if it all drys out before getting a professional in to redo the floor.

Do i need to do anything else? And what would you recomend i do about the patio gap so this doesnt happen again?

Thanks for your time.

 

[HERTS P&D]

Pictures of garden would help.

Andy

 

[Sythur]

Pictures of garden would help.

Andy

Done sorry took me a while to figure it out.

I've already dug the stones out so i labeled one of the pictures, the stones were level with the raised patio.

Cheers

 

[HERTS P&D]

That down pipe doesn't help, can that de re-directed?

You also need to remove more stones so that they are 150mm below the dpc.

Andy

 

[Sythur]

That down pipe doesn't help, can that de re-directed?

You also need to remove more stones so that they are 150mm below the dpc.

Andy

Yeah i could move it to the nearside corner so the bulk of the water stays away from that wall. Just checked the water run and while not rapid it does run towards the drain, unfortunetly it seems to drain through a small hole in the concrete the extension is built on rather than make it to the drain...

Starting to feel like im pulling at a never ending thread.

 

[HERTS P&D]

The down pipe should be run into a gully or soak-away.

Andy

 

[tell80]

Maybe get help with someone to draw a few simple, dimensioned wall/ground section views for each elevation ?
You, & anyone doing floor work for you, need a clear mental picture of where your FFL's stand in relation to the ground levels outside.

There also seems to be a damp issue at the knock-through threshold?
Why not post pics showing the extension floor, & the damp laminate flooring area?
It might seem obvious where the damp is coming from but on investigation it might be coming from somewhere else?