After 25 years covered with bitumen backed tiles(Heuga)I had our Burmese teak parquet refurbished last summer. However, over the winter, gaps have opened up (at least 5mm in some places) mainly along the runs of the underfloor C/H pipework. I am reluctant to lift/repair at this stage in case it simply happens again !! I think the gaps are too wide and will look very unsightly if I just fill. Also the bitumen adhesive 'bond' has broken down in some places. Should I cut my losses and resort to a new floor?