Fix a bodge. Closing cavity with timber floor

[Chaser]

Although I'm sure this should have been done differently, and I suspect there might be several wrongs in it, rather than start all again I need to rectify it so that I can finish the chipboard floor to the door opening.

Suspended timber floor which is bolted up to the inner leaf. Top of the Inner leaf is approx 40 below top of joist height. Cavity isn't filled between it.

[img]https://thumbsnap.com/s/hHoIoTtX.jpg[/img]|https://thumbsnap.com/hHoIoTtX
[img]https://thumbsnap.com/s/cMlk5dV1.jpg[/img]|https://thumbsnap.com/cMlk5dV1

The timbers are insulated between with 75mm foil backed insulation so ideally want to finish over this with some insulation to prevent cold bridging but don't want to introduce damp.

Whats the best way to do this? DPM is directly under door.

 

[noseall]

No one can click on the images...?

 

[SFK]

https://thumbsnap.com/s/hHoIoTtX.jpg

https://thumbsnap.com/cMlk5dV1.jpg

 

[noseall]

I can tell you what should have happened, i.e....

Inner skin taken down to floor joist level....joists onto DPC on inner skin but 50mm short of external skin...polythene DPM turned up the outer course....50mm insulation butted against outer course and DPM.

Those bolts are not gaining a lot from that top course and are likely to fail in time.

You are probably going to have to place a timber into the cavity, tight against the inner leaf and bolt right through from that pole plate bearer, using polythene and insulation as a barrier...somehow.

 

[noseall]

Whats the best way to do this?

The other alternative would be to remove the inner leaf masonry down to joist level and remove the bolts and bend those jiffies back out of the way. Then fix a pair of say two additional 8" x 2"s (whatever the joist thickness) along the wall and bolt right through the lot including the existing plate.

Add an additional 25mm batten to catch the remainig floor board and fill the gap to the external wall with say 50mm foil board insulation. The chipboard above will carry the 50mm.

The whole trough should be lined with DPM and with DPC on the masonry, prior to timber fixing.