GJP Floor Sanding uses specially manufactured strips of reclaimed pine, the strips are glued with a D3 PVA glue and hammered into the gaps before being chiselled off and polished back. To give you a more detailed overview of the process:

Step 1:

Re-nail floor, punching all nail heads into the floor 3-4mm deep

Step 2:

Clean joints out carefully, taking care not to catch any electric cables/water pipes, etc

Step 3:

Take the wedges (“Slivers”), place them into the joints (ie. the gaps between the boards) to check that the Sliver ‘seems at home’.

Remove Sliver and put glue down each side.

Now place Sliver into the gap, take a hammer and bounce it up along the Sliver, forcing it into the gap. The further it goes in, the better. The Slivers will squash the boards up