suspended wooden floor joists

[Seanalexander]

Hi All,
I would like to ask a question to anyone that may be able to point me in the right direction, my house is a solid wall 1905 build terrace )
I discovered to my horror that I didn't have any vents to my subfloor, as well as the ground outside the front of my house had bridged the DPC.

I have two sleeper walls that break up the length of the room, the wet rot has effected the third that is to the outside wall both joists and flooring.

I have placed two vents in the front wall as it is the only wall that it can be done on as an extension was placed on to the rear of the property for the kitchen, as well as cleared the bridge to the DPC,
Now heres my question from the second sleeper wall to the front the joist are about 3 meters. The previous owner built a block wall 6 inches in front of the mall wall for support but then filled it with building debris.
1. I want to remove the block wall so the subfloor can breath better, but the joists are supported by this wall,
so can I use use direct face heavy duty joist hangers with resin bolts to mount them to the wall?

2. I'd like to sister the the original joists to the new ones ( after cutting out the wet rot sections and treating the subfloor level)

Please be gentle lol, (I cannot afford to get a trades person in) I come from a builders family so can do most things. I just need some guidance please.
Sean

 

[Deleted member 323070]

Can you not just honeycomb the block wall to allow ventilation through that wall?
That is how it should have been built.

 

[Seanalexander]

Can you not just honeycomb the block wall to allow ventilation through that wall?
That is how it should have been built.

I've had to cut sections in between joists in three sections to remove all the building debris that was almost up to floor level and its only celcon block, plus in the corner near the chimney breast front wall hes hidden some poor brick work connecting my Party wall to my neighbour and until i remove that section I will not know what has to be done. So rather that try to rebuild the block wall and as I have to replace the support beam on top on the block as its rotten joist hangers with resin bolts seemed like the easiest path.
My original sleeper walls were not Honeycombed either so i put 900mm concrete lintels in to allow more air flow to the back of the floor level as i still have to insulate the floor before the end of the year.

Sean

 

[Deleted member 323070]

This is all the honeycomb that is required to provide ventialtion in the sub floor.
It doesn't require the sleeper wall to be rebuilt, just remove a brick here and there.