Damp or mould

mikey72

What's in the picture in the corner?
Is that the floorboard that looks rotted at the bottom of the same shot?

justjohn

dahac wrote: »

What will they do just so I have some idea, injection dpc

remove rotting joist, splice or renew(protect ends from damp). drill holes and inject dpc chem both sides of wall. remove plaster 1m up in infected area. They will also test for damp further along wall. They may also treat for other things. (dry rot,woodworm etc)

Maybe more depending on the prob.

justjohn

You said you have had floor up...

What are the joist ends sitting on/in?
Is any of the joist in contact with the earth at any point?
how deep is the void under the floor?
You said you seen a repair ..was it spliced?

dahac

I have had it up, the joist aren't in contact with any earth and they sit on bricks with damp proof protection, they also go into the joining wall. It's 500mm void space under floor and yes the replace joist has been spliced the old and new.

justjohn

if a joist is wet ...its acting like a sponge. joist should never be wet..

joist should be protect as it goes into wall also.

Did you splice the other joist or previous owner?
Is the previous repaired joist damp (use damp meter)?

dahac

The joist aren't wet just really soft. No this was already done. I think that it's in the cavity that's the problem as I have already cleaned this once but maybe not enough. The gas pipe is coming in from outside to in so I might try cleaning cavity to the pipe as there isn't any point in dpc unless these are clear as the floors inside are the same level as the outside street.

mikey72

So is that the gas pipe and gas meter in the shot?

justjohn

damp proof company will at least dpc that external wall and splice the joists.

Whats on the other side of that external wall?(blocked down pipe/drain/gutter down pipe would be nice lol)

dahac

Yes that's the gas pipe coming up from under the floor. Inside timber floor lelvel is the same level as the front street which is large concrete flag stones which isn't part of our property as its the front street.

cyclonebri1

Well it's definitely rising damp.

I still didn't think they did cavity walls 100 years ago, I thought they came in about 1930?

OP, is there any sign of a physical DPC apart from the chemical treatment you can see on the outer skin? lead or slate would have been used at that time ifthey fitted 1.

Well it's for certain now the wallpaper you wanted to save in post #1 is the least of your worries, I'd get the skirting and plaster hacked of that wall to a height of about 18" to start with.

Not quite got a clear picture, but am I right in thinking the floor boards are end on the wall in the pic? that would mean a fair bit of work to expose the issues with the joists.

One thing that springs to mind is that there is a gas pipe that runs through the wall exactly above where you have the main issue.

Is there any chance that is allowing water ingress into the cavity?
Can you check outside, and is it running down or up through the wall?

Try a few more pictures, it helps.;)