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Suomi Installation instructions
Receipt of goods
Check that all goods in the consignment are there. A report on damage caused by faulty delivery or transportation must be made in the consignment note, and the manufacturer or retailer must be notified immediately. A faulty product must not be used.
Handling
The sheets are unloaded onto an even platform organised by the customer. The piles must be off the ground, and there must be transverse supports at intervals of 1 m. Sheets must be removed from the piles by lifting, not by pulling. The sharp end of a sheet will damage the coating of the sheet beneath when pulled. Thin metal sheets are subject to dents and creases so handle them with care. Tile-patterned profiles are subject to stretching, which hampers installation. They must not be lifted by pulling them from the end, but must be moved to the roof using ridge planks or lifting them into a vertical position from several points at their edges. Stains can be removed using a neutral detergent.
Storage
Galvanised sheets must not be stored in tight piles. The sheets must be covered and stacked by cross-hatching or by putting slats between the sheets. Removal of surface water and ventilation can be done by laying the sheets at a slight angle and opening up the ends. Plastic-coated sheets can be stored without packaging or in their transport packaging in normal weather conditions for a maximum of two weeks. Coated sheets such as galvanised can be stored for longer periods.
Preparation for installation
Sheets must be lifted onto the roof from the ground along strong planks reaching up to the cornice. Avoid handling the sheets in windy weather. The wind will easily take hold of the broad, flat sheets. Any necessary cutting can best be done using a nibbling machine or contour saw. A circular saw must not be used, because the cutting and the shards that it produces can damage the surface of the sheet. The edges and corners of the sheet are very sharp and, after cutting, very jagged. Use mittens and protective clothing. The sheets are also slippery. Damp, wet and icy sheets are extremely slippery. When working on the roof, always use a safety rope and appropriate footwear. Use scafcorrugationing that is of sufficient height and at a suitable working distance. When moving the piles of sheets, always ensure that the lifting equipment is firm and strong. Do not go beneath a suspended pile or suspended sheet.
Roof boarding and measurement
When selecting the thickness of the roof boards, take into account the length of the mountings and the height of the sheets corrugations. The roof boards must all be of the same strength. It is advisable to fit two boards side-by-side on both sides of the ridge. When carrying out roof boarding, the installation of possible snow stops must also be borne in mind. The profile-specific distribution of the boards is done according to the attached table.
Profile sheets are usually delivered cut-to-size, i.e. the same length as the roof. As a general rule, it can be said that the length of the profile sheets is the same as the length of the rafters plus the gable board. Sheets must be installed on the roof so that they overhang the gable board by 20-30 mm. That way, a small ventilation gap is left at the ridge.
When the roof is made of several sheets, there should always be a roof board under the overlapping point. The overlapping distance must be at least 150 mm. Check the order of installation from the diagram.
If sheets of different dimensions are going to be put on the roof, for example over a terrace, for tile-patterned profile sheets the length of the cornice overhang must be divisible by the tile length of the tile pattern (350 mm or 400 mm), otherwise the tile pattern will not match with that of the actual roof. Also at joint sections, the multiplicity of the tile pattern must be borne in mind.
|
Profile type |
Dimension A |
Dimension B |
Dimension C |
Roof board D |
|---|---|---|---|---|
|
Peltitiili |
370 |
350 |
20-30 |
32 x 100 |
|
Otsamokate |
420 |
400 |
20-30 |
32 x 100 |
|
Suorat kuviot |
370 |
300 |
20-30 |
32 x 100 |
Ridge
Profile-shaped sealing tape must be fitted between the ridge capping and the profile sheet. Smooth roof cappings must overlap by at least 100 mm. In addition, the seams must be sealed with sealing compound. The ridge cappings are always fixed to the profile sheets on top of the corrugation, either with screws or pressure-resistant sunken rivets. The interval in between them must be about 300 mm.
Ventilation
With good ventilation and the careful installation of insulation and moisture-proofing, the temperature of the underside of the roof can be kept at the same level as the outside air. Therefore the ventilated space must be connected to the outside air.
Ventilation must be planned so that the ventilation air can flow unhindered from the cornice to the ridge. The air outlet openings must be located at the highest point in the roof: ventilation grilles at both ends of the building, a ventilated ridge capping or ventilation ducts.
In roofs that are difficult to ventilate (insulation near the roofing material), in addition to underlay, either a ventilated ridge capping or ventilation ducts installed in the ridge must be used.
Underlay
We recommend that underlay always be used when the space below the roof has insufficient ventilation. Under tile-patterned profiles in particular, underlay must be used to prevent condensation water from entering the structures. The underlay is fixed to the roof trusses. The roof boards must be nailed on top of the underlay.
Installation of sheets
Installation of the sheets always starts, at the end on ridge roofs, and at the hip point on hip roofs. The capillary groove at the edge of the boards always goes down. Installation can start either from the left or right end. Install the sheets in straight lines down to the lower cornice, with an overhang of about 20-30 mm.
Put the first sheet in position and attach it to the ridge with one screw. After that, fit the sheets firstly from the side seam, carefully checking that they are the same size. Attach the sheets to each other with roofing screws from the ridge, with a maximum distance between the screws of 500 mm.
Fit three or four profile sheets in this way. After that, carefully align the 3-4 sheets that you have laid according to the position of the lower cornice. Attach the sheets to the roof boards and continue installing.
End cornice
The end eaves flashings must at least reach over the first corrugation of the profile sheet. If the profile sheet does not end at the cornice, the sheet must be split or more sheets must be overlapped. The end eaves flashings must be fitted to the profile sheet either with screws or sunken rivets at intervals of about 1,000 mm. The flashings must overlap by at least 100 mm.
Side cornice
The profile sheet must overhang the fascia board by about 20-30 mm. In between the eaves flashing and the profile sheet, it is possible to use profile-shaped sealing tape, but then you must ensure that the ventilation air can pass under the roof through another channel.
Continued overlapping
Continued overlapping can take place at points where the substructure provides sufficient support for it. The sheets must overlap by at least 150 mm. Sealing tape or sealant must always be used at the overlapping seams.
Roof valley
The part of the roof under the roof valley flashing must be completely boarded. The roof valley flashings must overlap by at least 150 mm. The seams must also be sealed with sealing compound. Profile-shaped roof valley sealing tape is used in between the flashing and the profile sheets. The sealing pieces of this tape are slanted. The tape is available in both right and left-handed forms. The flashing is fixed to the substructure with the profile sheets, either with drilling screws at the bottom of the grooves or with nails on top of the corrugations. The interval in between them must be about 300 mm. On the ridge, the end of the roof valley flashing must stretch to underneath the ridge capping and the joint must be carefully sealed.
Outer joint
Ridge cappings are used in the outer joint and they are installed as shown in the paragraph entitled ‘Ridge’. Using the hip’s Y-joint and end pieces, it is easy to make the hip structure sealed and neat. Profile-shaped outer joint sealing tape is used in between the ridge capping and the profile sheets. The sealing pieces of this tape are cut slanted. The tape is available in both right and left-handed forms.
Side flashing
Profile-shaped sealing tape is used between the flashing and the profile sheet, against the corrugations of the profile sheet perpendicular to the front hip. The flashing is fixed at intervals of 300-400 mm. The hip flashing must overlap the profile sheet by at least 100 mm, and the seams must be sealed with sealing compound. The gap between flashing and the wall must be sealed in a manner required by what is underneath.
Exhaust ducts
For the cooker hood ventilator and air conditioner, a sheet-metal roof needs Ø125 mm heat-insulated ducts equipped with adjustable angles and underlay. Ø110 mm uninsulated ducts are required for the drain ventilation pipe.
Exhaust duct flanges
The roots of round pipes, antennae, etc. that go through the roof are best sealed with exhaust duct flanges equipped with LPD rubber. These come in a range of sizes with outer diameters of 40-350 mm.
Mounting using short roofing screws
The sheets are fastened to the cornice and ridge at the base of at least every second corrugation. 6-7 screws are required per square metre. Lateral overlapping on top of the corrugation, max. distance between fasteners 400 mm.
Use sealed roofing screws. A chuck is required for drilling.
The screws must be fitted perpendicular to the surface of the sheet. Then the screw will not slip.
Mounting with long roofing screws or ringlock nails.
Before nailing, the sheets must be punched with a spike or drill. The sheets are attached with ringlock nails over the corrugation and under the corrugation of the profile sheet – except at the cornice where they go over.
The screws must be hammered in perpendicular to the surface of the sheet. Do not hammer in the nails so deeply that dents form in the sheet, through which water can penetrate into the substructure. About 7 nails are required per square metre.
The first nail must be hammered into the base of the corrugation at the upper edge of the sheet (stays under the ridge capping). The sheet is then attached on top of every second corrugation.
The roofing sheets must be attached to each other at each rafter, or at least at intervals of 400 mm.
Roof ladder installation
The raised brackets are fitted to the frame of the roof ladder at roughly the right places, at maximum intervals of 1,400 mm. After that, the raised brackets must be screwed into the roof boards at the upper and lower ends with 7 x 50 HVAC screws; EPDM sealing tape or a rubber washer must be used to seal. The raised brackets in between must then be attached at exactly the right places. At the top of the ladder, ridge fasteners fitted under the ridge capping can also be used.
Wall ladder installation
1. The ladder is dimensioned so that its upper rung is positioned about 100 mm below the height of the cornice. The lowest step is 1,000 – 1,200 mm above the ground.
2. The wall struts of the ladder are dimensioned so that the distance between the centre line of the rungs and the cornice or other protrusion is at least 200 mm. If necessary, the struts can be shortened to a suitable length.
3. The wall struts are attached to the ladder with clips so that the upper pair of struts is as close as possible to the cornice and the lower pair is between the first and second rungs. The struts should always be attached to the wall’s load-bearing structures. The maximum distance between the pairs of wall struts is 3,000 mm.
4. Attach the cornice supports to the wall struts and cornice structures. The purpose of the cornice supports is to prevent the ladder from swaying.
5. Fit the ladder bows to the ladder. If necessary, the ends of the bows going towards the roof can be shortened. The ladder bows can be attached either to the roof ladder using a stirrup bracket or to the roof using an L-shaped bracket. The bows of the roof bridge must be connected using jointing sleeves.
Roof deck installation
As a support, the roof deck requires the same slope adjusting plate as the snow stop. The support for the roof deck is made by combining the snow stop mounting and the slope adjusting plate. The adjusting plate is adjusted so that the roof bridge is horizontal. The roof deck is fixed to the adjusting plate. The decks can be extended by joining them together with lap joints and tightening their bases. 8 x 16 mm bolts are used for this. The roof deck supports should be fitted at 1-metre intervals. The holes at the base of the supports must be sealed with adhesive sealing tape. Attachment to the roof boards at the upper and lower ends is done with 7 x 50 HVAC screws.
Snow guard installation
Snow guards prevent potentially dangerous situations caused by ice and snow falling from a roof. They can also protect structures located on the roof. The snow stop should be positioned as near to the cornice as possible, so that the weight of the snow is transferred to the load-bearing structures.
As a general rule when measuring for a snow guard, it can be said that, for a roof measuring less than 6 m, one row of snow stops should be installed at the cornice and another row halfway up the roof (max. 12 m). Over doors, special attention must be paid to the fitting and measuring of snow guards. For example, when installing a 3m snow guard over a door, at least four mountings must be fitted, so that the ends of pipes or profiles do not exceed the mountings by more than 100 mm.
When installing a snow guard on a tile-patterned sheet-metal roof, special snow guard mountings for tile-patterned roofs must be used. The holes at the base of the supports must be sealed with adhesive sealing tape. The supports must be fitted to the base of the corrugations under the transverse corrugations by screwing their top and bottom ends to the roof boards with 7 x 50 mm HVAC screws. The gap between screws must not exceed 1.2m.
Roof installation instructions
When you change the old roof of your house for a new steel roof, you should bear in mind the following things:
- check the slope/incline of your roof and select a suitable profile for it
- check the load-bearing structures of your old roof, the roof boarding and rectangularity
- make the necessary corrections
- underlay
- ventilation under the roof
It is easy to install a new roof on top of a carefully constructed roof boarding.
A. FOR OLD PROFILE ROOFS
1. Leave the old profile sheeting where it is
2. Nail vertical battens the same height as the profile (min 32 mm) at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Attach new profile sheets to the roof boards
5. Fit seals and flashings
B. FOR OLD TRIANGULAR ROOFS
1. Leave the old triangular roof in place
2. Nail vertical battens at least as high as the triangle at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Fit new profile sheets to the roof boards
5. Fit seals and flashings
C. FOR OLD SMOOTH FELT ROOFS
1. Leave the old felt roof in place
2. Nail vertical battens (min 32×50 mm) at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Attach new profile sheets to the roof boards
5. Fit seals and flashings
D. FOR OLD ASBESTOS ROOFS
1. Dismantle the old roof down to its boards and fit underlay if it has not already been done
2. Nail vertical battens (min 32×50 mm) at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Fit new profile sheets to the roof boards
5. Fit seals and flashings
E. FOR OLD TILE ROOFS
1. Dismantle the old roof down to its boards and fit underlay if it has not already been done
2. Nail vertical battens (min 32×50 mm) at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Fit new profile sheets to the roof boards
5. Fit seals and flashings
F. FOR OLD SEAMED SHEET-METAL ROOFS
1. Leave the old roof in place
2. Nail vertical battens at least as high as the seams (min 32 mm) at the position of the roof trusses
3. Fit new roof boards at intervals dictated by the profile sheets
4. Fit new profile sheets to the roof boards
5. Fit seals and flashings