1. SETTING OUT Please adhere to the maximum spacing of purlins according to roof pitch
charts in this document. Distance between purlins must be the same.
Sheets are fixed directly on purlins.
2. CUTTING First
mark out the sheet then cut with an oiled coarse-toothed handsaw, or
preferably a power saw.
3. SHEET LAYOUT
Start fixing sheets at the opposite end of the roof from
prevailing winds. Cut a sheet in half vertically, and use to lay sheet
courses in a broken bond pattern.
4. FIXING Use
Onduline recommended nails or screws. Check you have the correct sheet
side lap and sheet end lap. Use a string line to keep fixings aligned.
Always fix on top of corrugation.
5. FIXING ORDER See
larger drawing in this document about fixing order and fixing details
6. EAVES DETAILS The
maximum sheet overhang at the eaves is 7cm. Reduce the distance of the
first purlin from the facia accordingly.
7. RIDGE UNIT FIXING Fit
ridge board and support purlin. Fix second purlin, its position being
dictated by the roof pitch. The sheet /ridge can then be fixed.
8. RIDGE FIXING UNIT Start
fixing the ridge at the opposite end of the roof from prevailing winds,
and form a minimum of 12.5cm overlap. Use a string line to align. See
detailed relevant drawing in this document.
9. HIP DETAIL Fix
hips before ridges. Lay support board and trimming purlins. Fix ridge
units to trimming purlins, cut and dress units and overlay with ridges.
10. VERGE FIXING Fasten
barge board level with the top of finished Onduline roof. The Onduline
verge units are then overlaid and fixed into position. Use Onduline
verge or Onduline ridge as verge.
11. VERGE FIXING (ALTERNATIVE) Alternatively,
fix barge board level with the underside of the Onduline corrugation
and overhang corrugation. Fold down and fix in position.
12. SIDE WALL ABUTMENT Form
side wall flashing to Onduline roof, using Onduline Reparo flashing
tape or similar, and fix separate cover flashing to the wall.
13. END WALL ABUTMENT Use
Onduline pre-formed apron flashing to seal end wall abutments. Use
separate cover flashing to the wall to allow for movement.
14. ONDULINE TILE EFFECT Cutting
Onduline sheets into 50cm lengths and fixing with a 20cm overlap easily
creates a pleasing tile effect shadow line.