Bight marks occur in linoleum where a continuous sheet loops over poles in the drying oven while it's curing.

The bight marks at the top are cut out at the factory and the discarded material is recycled.

However, the marks at the bottom of each loop are left in the sheet.

In the finished roll they often appear as a slight ridge across the sheet, about 150 mm wide.

With products that are 2.0 to 2.5 mm thick, the ridge can be stuck down in the normal way as long as the site is warm and the bight mark is well rolled both across and then along the sheet.

But with 3.2 mm material, or if the temperature is cool, you may need to either cut out the bight mark or use the following technique:

1. As you feed the sheet into the wet adhesive and reach the bight mark, lean gently on the mark and rock it in and out of the adhesive, making sure there is a complete transfer of adhesive onto the hessian backing.

2. When the loop of material being fed into the adhesive clears the area of the bight mark, immediately roll it with a 68 kilogram roller and remove any bubbles or trapped air.
   
   
3. Continue to roll the bight mark every 15 minutes until it has fully bonded to the subfloor.

An alternative method is to use contact adhesive on the subfloor where the bight mark falls. For more information on this process, see the Forbo Floorcoverings Installation Guide'

Removing end curl

The end of the linoleum sheet also needs to be laid carefully, to make sure that the hessian backing beds well into the adhesive.

If you fold the corner back diagonally and use a 'bouncing' action as you place it into the adhesive, it will help to relieve the tension in the end of the length.

Then roll the sheet thoroughly with a floor roller.