Rotting wood floor?

[AdamD]

Just noticed this by our back patio doors, seems to have come on quite quickly. Looks a bit odd as it is only in that area of the floor. As it happens it’s the area of the floor we had to take up to replace rotting joints last year, so it’s clearly connected. Seems odd that it would have become damp enough to rot in that time though.

 

 

[ProDave]

So it's right by a door.  You need to look at the detail of that door threshold, I bet water is getting in under that somehow.

[Marvin]

1 minute ago, ProDave said:

So it's right by a door.  You need to look at the detail of that door threshold, I bet water is getting in under that somehow.

+1

[Conor]

That's water ingress, not just damp. My money is on a bodged uPVC door installation or a new patio / surface above the dpc with no perimeter drainage.

[AdamD]

There used to be a concrete patio outside that door, higher than it is now. It is now hardcore decorative stone, at a lower level with better drainage so I’d be surprised if it is that but it certainly looks like it.

[AdamD]

15 hours ago, Conor said:

That's water ingress, not just damp. My money is on a bodged uPVC door installation or a new patio / surface above the dpc with no perimeter drainage.

Thanks. What would you do as first steps to diagnose?