DIY INSTRUCTION VIDEO
DRILLING a PILOT hole into the treads for dense timber types. All stringers in the kits come pre-drilled ready to assemble (the stringers are the side timbers that hold the treads). For dense timber types such as Merbau or Spotted gum, when the tread is located in the stringer you can use the pre-drilled hole in the stringer as a guide to drill a pilot hole into the tread. While not required, it does make assembly easier.
OSK stair kits are made from quality timbers which will benefit from stain or paint. For extra protection, painting or staining the kit before assembly especially where the treads are screwed into the stringers will ensure longevity. Treated pine kits will benefit from the application of a stain or paint.