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840 STRUTTING TO FLOOR JOINTS
• Type: One of the following:
- Herringbone strutting: At least 38 x 38 mm softwood.
- Solid strutting: At least 38 mm thick softwood and at least three quarters of joist
depth.
- Proprietary metal strutting: approved types only.
• Fixing: Between joists as follows:
- Joist spans of 2.5 to 4.5 m: One row at centre span.
- Joist spans over 4.5 m: Two rows equally spaced.
- Strutting must not project beyond top and bottom edges of joists.
• Outer joists: Blocked solidly to perimeter walls.

910 EAVES SOFFIT VENTILATION
• Soffit boards: Fixed to leave a continuous ventilation opening not less than 10 mm
wide for full length of eaves.
• Insect mesh: A 3-4 mm mesh screen fixed across the opening to prevent large
insect entry.

RotF generic (intermediate) NBS 2014 6118-AEW-XX-XX-NBS-A-01