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Ive got an engineered oak floor in the kitchen that I put down 4 years ago. T&G glued joints and the whole thing is floated over a chipboard subfloor with the foam underlay. 90's house, no issues with damp or movement etc. oh - and its unfinished oak with Osmo polyX applied after fitting.
im now ready to put down the same in the hallway. instead of using a threshold strip id like to attempt to join onto the existing to get a continuous floor. Im aware this might not work buy my logic is if the joint fails, I can route out a channel and put a threshold in in the future and im no worse off for trying
Ive mocked up and dry fitted the boards shown. ive got a biscuit jointer so my plan is to put 3 or 4 biscuits across the board and glue the joint with either the D4 wood adhesive ill use on the other joints, or a thixotropic gel adhesive, then give that 24 hours to go off before I continue with the rest of the floor - sensible??
under that bit of board i could just use foam to match the adjoining board but I was wondering if it would be worth setting in on a bed of gripfill or similar to make sure the board has zero deflection to stress the biscuits? I also thought I could isolate the board from the glue with a layer of masking tape or baking paper so that it remains free off the subfloor - good idea or am I overthinking it?Â
It sounds like you've got it all figured out really well to be honest.Â
To get pressure onto the join, you could screw a temporary batten to the chipboard so that you can tap some wedges against it to push the board sideways onto the joint.Â
Otherwise, everything you say sounds really good I reckon.Â
Ah yes temporary baton and some wedges is a great shout thanks kayakÂ
If you've got some really thin packing to do to get everything level, and the plastic shims you can buy are all the wrong thickness, just get yourself a pack of playing cards. Thin, moisture resistant, non-compressible and easy to trim.
FYI.
We had a floor that was already fitted when we bought the house (thick, engineered not oak), spanned 3 rooms in one run/go. In the heat it would expand and raise the floor by 1 or 2cm! (Some cut a gap and shoved a threshold in the gap and that solved the expansion problem).
Make sure you have enough expansion.