Stable and safe environmental protection.
We were first in Sweden to offer our customers a roof frame hatch (tongue and groove hatch) that was type-approved for strength grade C14. The hatch is sold under the name Derome Hatch.
The Derome Hatch is available in five versions. STANDARD: can be ordered in untreated, primed and undercoated variants. TIMBER-PRESERVER TREATED: treated with Grön-Fri on the grooved side to minimise the risk of microbial growth during the construction period. EAVES BOARD: a primed variant made from extra fine board of G4-2 grade. The paint used for priming is Tikkurila Pinja Protect S.
Our roof frame hatches are type-approved for C14 (∫mk=14 MPa), thereby easily meeting the strength requirements demanded by the industry. The lowest strength values described in current standards are for strength grade C14 (∫mk=14 MPa). When designers do not specify a strength grade they generally assume the lowest values. This means you can feel confident in using the type-approved Derome Hatch. For choice of thickness of the Derome Hatch, eaves overhang and a stability calculation, consult the designer of the building.
The roof has to protect your building for many years. Tongue and groove board, in combination with a second sealing layer, provides environmental protection that is more stable and reliable than most other alternatives. Roof frame hatches (tongue and groove hatches) save time and money during assembly compared to loose tongue and groove boards.
Painted with one of the market's leading paints, Tikkurila Pinja Protect S. Painting is performed in accordance with the paint manufacturer's instructions. A painted hatch provides greater protection for the product and saves more time on the construction site. The primed hatch is given one coat of the paint system above, while the undercoated product is given two coats.
A product that is approved and inspected during manufacture meets the requirements specified in applicable Swedish laws and regulations. Type approval means that the product's characteristics have been verified via tests at a competent test body or on the basis of calculations. The manufacturing process has been subject to inspection for the purposes of quality assurance. Inspection means that the manufacturer has systematised and documented the manufacturing process, thereby resulting in fewer defects and lower costs.
(Source: SP SITAC website)