Prep for Internal Corners
Here’s the surface prep information for internal corners:
There must be no voids between adjacent walls or the wall & floor. If you are fitting the boards yourself, use an adhesive sealant along the bottom edge of the boards and squash the boards down to the tray/floor. Don’t smear sealant or silicone on the surface, instead, let it ooze out and razor scrape off the excess once it is dry. Use wide, self adhesive skrim tape to bridge the internal corner.
All boards must be well glued and screwed in place. so that any chance of movement has been eliminated.