Kerabit Roof Shingle
The underframe of the roofing must be solid and even. The underframe can be rough tongue-and-groove boarding or moisture resistant construction board. The thickness of the substrate material depends on truss spacing. If the substrate is old felt roofing, it must be flat, dry and tight. In storage the shingles must be protected from rain and sunshine. If the fitting temperature is below +5 ºC the shingles and fitting material must be stored in a warm place before fitting.
Before starting the installation, check that the ventilation of the underframe is sufficient and working.
Possible color variation in the roofing shingles and fitting material will even out within a year by the effect of ultraviolet radiation from the sun. To even out color variation mix the shingles from at least five packs. The roofing shingles can be installed to a roof with a minimum pitch of 1:5.
- Start the fitting by attaching the RoofAquaGuard underlay membrane. underlay membrane can be installed on top of an old felt or tile roofing, but the best result is achieved by fitting the underlay membrane directly on the underframe material. See item 7 before installing the underlay membrane.
Install the underlay membrane parallel with the eave. The upper edge of the membrane is nailed up with 15-20 cm spacing. The next membrane sheet is placed with a minimum overlap of 10 cm on the previous sheet and nailed down to the underframe. Remove the protective plastic covers of the adhesive edge and attach the adhesive edges to each other. Seal the overlaps with Kerabit jointing glue if the underlay membrane has no adhesive edges.
- Install an eave moulding on the lower eave. The moulding is nailed down with felt tacks using a zigzag pattern. At extensions the mouldings are lapped over for 3 cm. Check that the felt tacks do not go all the way through the eave plank. Next install the self-adhesive eave strip on the lower eave moulding. Remove the plastic cover of the under surface and press the strip in place.
Alternative method of installing
The upper edge of the eave is rounded. Remove the protective plastic cover of the eave strip, bend 1.5 cm over the lower edge of the eave, and press the strip in place. At extensions the strips are lapped over for 5 cm. Nail down the strip with 5 cm spacing to the side of the eave plank.
- The gable eave moulding is fitted in the same way as the lower eave moulding. If the gable eave is built as shown by the details in the figure, the RoofAquaGuard membrane must be installed on the wooden mouldings in such a way that it extends 1.5 cm below the underside of the underlay boarding.
- The valley is fitted with adhesive eave strip 1.1 x 10 nailed down with 10 cm spacing or alternatively with Kerabit 10+ surface membrane attached at the edges with jointing glue and nailed down with 10 cm spacing.
When installing shingles to a valley, cut their ends parallel with the valley using an alignment board; attach the shingles with jointing glue and leave a 15 cm free area on the bottom of the valley.
- Start the installing by fitting one shingle on both sides of the centre of the lower eave. Thus the effect of the length tolerance (±3 mm) of the shingle is eliminated. Remove the plastic cover of the shingle before installing. The shingle is attached with six felt tacks 2 cm from the upper edges of the notches or with wide (min. 1.6 mm) staples. The length of the nails and staples is determined by the thickness of the underlay material. When the first row of shingles has been nailed, install the next row in such a way that the lips of the shingles are at the upper edges of the notches covering the nails of the shingles. To check the straightness use a pane length alignment board or wire. Monitor the symmetry of the pattern during installation.
- Cut the shingles to the level of the gable eave and attach 10 cm of their ends to the eave plate with jointing glue. If the gable eaves are made as shown in figure 3, the shingles are attached on the wooden moulding in such a way that they extend to the outer line of the eave. The eave plate is installed on top.
- Triangular battens are installed in order to round off the corners at the base of the chimney stack or a large lead-through. Raise the underlay membrane 30 cm against the lead-through and attach the raised up membrane with glue. Do not, however, attach the raised-up membrane to the lead-though in structures where the movements of the roofing underframe structure and the lead-through are different, such as log buildings.
Install the shingles under and on the sides of the lead-through to the upper edge of the triangular batten. Cut strips of membrane to the base of the lead-through and raise them 30 cm against the sides of the lead-through. Below and on the sides of the lead-through, lap over the strips on top of the shingles, and above the lead-through, under the shingles at least 15 cm. The strips are attached entirely to the underlay membrane and shingles with jointing glue. Secure the attachment of the shingles above the lead-through with jointing glue. The membrane strips raised against the lead-through are protected with sheet metal which prevents water from entering between the membrane and the chimney. Round lead-troughs are easier to seal with prefabricated sealing the shape of the lead-through.
- The ridge is covered with ridge shingles. 4 shingles cover one meter of ridge. Remove the plastic cover, press the ridge shingle in place and attach with four nails in such a way that the nails are overlapped by the next shingle. The last ridge shingle is not nailed.
- Roof maintenance instructions
All Material must be installed in compliance with applicable codes and ordinances.
Manufactured by: Nordic Waterproofing Oy, PL 10, 04361 Tuusula, Finland