I don't have a drainpipe at the front either - there's actually 4 of us sharing the same drainpipe! I had a blockage at the back where you have pointed out the dark patch. I think the person I got to unblock it must've damaged it because I have noticed it leaking.I know nothing about building but it looks like you don't have a drainpipe out the back and your gutter has a low point at the join just next to the small window. Maybe it overflows in heavy rain onto the roof below, hence the dark patch on the wall at that point? This probably doesn't help matters and it would be a simple thing to fix. Good luck with this project!
Ive been told they should've put piping down to vent the rest of the kitchen when they poured the concrete, but I guess I won't know until I open the subfloor. Kitchen does seem alright though, Its only the chimney breast which has been coated in gypsum skim and I think cement before that.No problems. Take your time. Here's a few things I've noticed.
The underflooring conditions for rot and condensation are partly due to lack of through ventilation under the floor. The front air bricks seem to be too high set above the finished floor, & the back air bricks might have been blocked by the floor of the extension.
The front bitumen dpc has been bridged by the plinth and probably rubble in the cavity. The inside wall dpc should have been just below the joists.
If you re-use the joists then you will have to do bolt-ons. Any joist with dry rot then it must go. Dig into all joists looking for live bugs. Installing a suspended floor is not a difficult job.
First floor T&G floor boards can be lifted but might have bugs and will need a bit of skill to do it. They will be nailed through the tongues.
Remove the timber lintels above the meter box and use an angle iron or concrete lintel to brick up on top of. The gas pipe going up the wall should be in a corner safe zone with metal capping cover.
The wobbly look of the back of the house. Is there a large span breakthrough from the house to the extension.
The arch over the fireplace begins 17 courses up, about 54".
From floor level to ceiling Knock off plaster on all doubtful walls and when ready use sand and lime to make good. When its dried it can be painted or paper. Dont mess with lime putty plaster.
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