Hi,
I'm in the process of replacing my ground floor floorboards with 22mm t&g chipboard. This is as a result of having to rip the previous floor up to remedy issues with various services.
During the process I've discovered evidence of an historic damp issue which has left a joist end, and the portion of wall plate it was sat on, rotten.
This joist is situated under the area where the sink was located, by the rear wall. I need to replace that portion of the joist to ensure adequate support of the chipboard. The rest of the joist runs the width of the kitchen and seems fine. It is supported at intervals by dwarf walls.
I'm no builder so I'm looking for advice. I think my options are;
The other issue I have is that the mortar under the brick in this area has crumbled, effectively leaving a brick floating in mid-air as shown below.
The lime seems to have been washed out leaving just sand which has crumbled out.
I was planning to fill the void with gravel, as the void is around 120mm deep, and then pack it out with a sharp sand and lime mix. I've never worked with lime before. I haven't even seen it at the merchants before but my understanding that since these are solid walls, l should be using lime mortar rather than cement, especially near ground level.
As ever, advice based on experience is welcomed.
Cheers
I'm in the process of replacing my ground floor floorboards with 22mm t&g chipboard. This is as a result of having to rip the previous floor up to remedy issues with various services.
During the process I've discovered evidence of an historic damp issue which has left a joist end, and the portion of wall plate it was sat on, rotten.
This joist is situated under the area where the sink was located, by the rear wall. I need to replace that portion of the joist to ensure adequate support of the chipboard. The rest of the joist runs the width of the kitchen and seems fine. It is supported at intervals by dwarf walls.
I'm no builder so I'm looking for advice. I think my options are;
- Run a new piece of timber in parallel from the dwarf wall to some concrete blocks placed on the oversite - possibly using mortar to get the appropriate levels.
- Cut the existing joist at the dwarf wall and butt join a new piece that runs into the void in the wall where the previous joist was positioned. The issue which this option is that the wall plate at this location has rotted leaving a void. There is enough remaining, I believe to support a replacement.
The other issue I have is that the mortar under the brick in this area has crumbled, effectively leaving a brick floating in mid-air as shown below.
The lime seems to have been washed out leaving just sand which has crumbled out.
I was planning to fill the void with gravel, as the void is around 120mm deep, and then pack it out with a sharp sand and lime mix. I've never worked with lime before. I haven't even seen it at the merchants before but my understanding that since these are solid walls, l should be using lime mortar rather than cement, especially near ground level.
As ever, advice based on experience is welcomed.
Cheers