Overview of Timber Treatment for Radiata pine and Douglas fir
For full details check B2/AS1
Where timber treatments are used | ||
Level | Species | Building Element |
Floor framing protected from weather but exposed to ground atmosphere | ||
H1.2 | Radiata pine Douglas fir |
Jackstuds, subfloor braces, wall plates, floor joists to the subfloor, blocking, walings and battens, nogs and diagonal boards |
H1.2 | Radiata pine Douglas fir |
Interior solid wood flooring for ground floors |
Enclosed roof framing and trusses | ||
H1.2 | Radiata pine Douglas fir |
Sarking and framing not protected from solar-driven moisture through absorbent cladding materials |
H1.2 | Radiata pine Douglas fir |
Enclosed flat roof framing and associated roof members |
H1.2 | Radiata pine Douglas fir |
Enclosed skillion roof framing and associated roof members |
H1.2 | Radiata pine Douglas fir |
Valley boards and boards supporting flashings for box gutters, roof penetrations and upstands to roof decks |
H1.2 | Radiata pine Douglas fir |
All roof trusses, including gable end trusses, roof framing, ceiling and eaves framing, purlins and battens |
Enclosed wall framing protected from the weather | ||
H1.2 | Radiata pine Douglas fir |
Framing and other members within or beneath a parapet |
H1.2 | Radiata pine Douglas fir |
Framing and other members within enclosed decks or balconies (see H3.2 for cantilevered decks) |
H3.2 | Radiata pine | Framing and other members within enclosed cantilevered decks (including joist trimmers, nogs and blocking) |
H1.2 | Radiata pine Douglas fir |
Framing and other members supporting enclosed decks or balconies (including for cantilevered decks) |
H3.1 | Radiata pine | Battens used behind cladding to form a cavity (H3.1 treatments can be either solvent-based or boron. H3.1 boron treatments supplied grey primer-painted) |
H1.2 | Radiata pine Douglas fir |
All other exterior wall framing and other members including exterior and boundary joists |
Internal Wall Framing | ||
H1.2 | Radiata pine Douglas fir |
Internal walls |
Mid-floor framing | ||
H1.2 | Radiata pine Douglas fir |
All mid-floor framing, including boundary joists, ceiling framing and ceiling battens and double top plates |
Interior flooring | ||
H1.2 | Pinus species Douglas fir |
Interior flooring |
Other framing | ||
None | Radiata pine Douglas fir |
Wall framing and roof framing (including trusses) protected from the weather, in unlined and unoccupied farm buildings and outbuildings, except buildings with high internal humidity, such as saunas, spas etc |
H3.2 | Radiata pine | Framing exposed to the weather and above ground |
H4 | Radiata pine | Framing, such as fence posts and landscape timbers, that is exposed to the weather and is in contact with the ground |
H5 | Radiata pine | Framing, such as house piles, poles and crib walling, that is exposed to the weather and is in contact with the ground. |
Note 1: For structural use of other species, refer to NZS 3602:2003 Tables 1 and 2.
Note 2: For non-structural use of radiata pine, Douglas fir and other species, refer to NZS 3602:2003 Table 3.
Note 3: A higher treatment level also satisfies the level specified in this table.