Uses for OSB/3 in Roofs and Walls

Instructions for Installation in Roofs

  • When installing boards outdoors, make sure to cover them immediately afterwards to protect them from the weather.
  • Leave expansion gaps where boards abut other structures.
  • When covering surfaces more than 10 m long or wide, leave an expansion joint in the middle. With even larger surfaces, multiple expansion joints may be required.
  • When laying on joints or rafters, the joints on the narrow sides of the boards must lie on the substructure.
  • Check beforehand to make sure that rafters or frames are straight and run parallel to one another.
  • If boards become wet from the rain, immediately dry and cover them with cardboard or roofing tiles, sheeting or shingles.
  • Unheated spaces under the floor or roof must be well-ventilated. The area of the ventilation openings must amount to at least 1/150 of the base area of the space being ventilation.
  • Lay roof boards with their long sides at right angles to the rafters. Joints between the shorter sides must rest on the rafters.
  • Leave expansion joints at least 3 mm wide between straight edges.
  • Each board must rest on at least two supports, and the joints between boards must always be on a support.
  • When laying roof boards, workers must stand and walk on rafters or frame elements only and observe all relevant safety and accident prevention rules.
  • When making apertures for chimneys, leave gaps between boards and the chimney as required by building regulations.
  • Fix boards using either wood screws or screw or ring-shank nails with a length that is at least 2.5 times the thickness of the board being attached.
  • Observe all general standards and regulations that apply to the application at hand.

Installation Instructions for Walls

  • When installing boards outdoors, make sure to cover them immediately afterwards to protect them from the weather.
  • Make sure to leave expansion joints at least 3 mm wide between boards and door and window openings.
  • Leave expansion gaps where boards abut other structures.
  • The recommended wall board thickness in frame houses is 12 mm for board lengths up to 62.5 mm and 15 mm for board lengths up to 83.3 mm.
  • Use storey-high formats. Joints in the middle without back-blocking are not allowed (this also applies to T+G) when boarding has a reinforcing or stiffening function.
  • Observe all general standards and regulations that apply to the application at hand.
  • Wall boarding must meet the requirements of the Eurocode 5 National Application Document.

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