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.
