Metal Tiles and Metal Roofs Fascia Installation
Hip & Gable Roof - Eaves Detail
| Soffit Width mm | 300 | 450 | 600 |
| Dimension 'A' mm | 295 | 445 | 595 |
Note:
- 90x45 soffit bearers used unless stated.
- Soffit bearers fixed to right or left hand side of rafter.
- 10mm clearance allowed for soffit.
Gable End Detail
| Soffit Width mm | 300 | 450 | 600 |
| Dimension 'A' mm | 295 | 445 | 595 |
In heavy snowfall and wind areas, brackets and snow traps must be fixed at 450mm centres.
In medium wind areas it is advisable to fix the brackets at 600mm centres maximum.
Drop Heights (Dimension C in mm) for Roof Pitch and Soffit Width
| Roof Pitch (degree) | Soffit Width 300mm | Soffit Width 450mm | Soffit Width 600mm | Soffit Width 750mm |
| 10 | 95 | 123 | 151 | 179 |
| 12.5 | 107 | 140 | 173 | 206 |
| 15 | 120 | 160 | 200 | 240 |
| 17.5 | 133 | 180 | 227 | 274 |
| 20 | 145 | 200 | 254 | 309 |
| 22.5 | 160 | 222 | 284 | 346 |
| 25 | 173 | 243 | 313 | 383 |
| 27.5 | 188 | 266 | 344 | 422 |
| 30 | 202 | 289 | 376 | 463 |
| 35 | 233 | 338 | 443 | 548 |
| 40 | 268 | 394 | 520 | 646 |
| 45 | 306 | 456 | 606 | 756 |
| 50 | 350 | 529 | 708 | 887 |
Notes for Installers
- To ensure birds cannot enter the roof space, there should be no gap between the bottom purlin and the back face of the gutter after the system has been installed.
- NOTE: Soffit bearers are required on all hip corners and should be cut back 10mm.
- Where loose fill insulation is used, the soffit must be blocked off at the top plate to prevent the insulation coming into contact with the metal fascia.
- Zincalume coated gutters should have a minimum fall of at least 1:500 and should not have permanent ponding. Check with your nearest distributor for further details.
Concrete Tile Roofs Fascia Installation
Hip & Gable Roof - Eaves Detail
| Soffit Width mm | 300 | 450 | 600 |
| Dimension 'A' mm | 295 | 445 | 595 |
Note:
- 90x45 soffit bearers used unless stated.
- Soffit bearers fixed to right or left hand side of rafter.
- 10mm clearance allowed for soffit.
Gable End Detail
| Soffit Width mm | 300 | 450 | 600 |
| Dimension 'A' mm | 295 | 445 | 595 |
In heavy snowfall and wind areas, brackets and snow straps must be fixed at 450mm centres.
In medium wind areas it is advisable to fix the brackets at 600mm centres.
Drop Heights (Dimension C in mm) for Roof Pitch and Soffit Width
| Roof Pitch (degrees) | Soffit Width 300mm | Soffit Width 450mm | Soffit Width 600mm | Soffit Width 750mm |
| 17.5 | 107 | 154 | 201 | 248 |
| 20 | 118 | 173 | 227 | 282 |
| 22.5 | 133 | 195 | 257 | 319 |
| 25 | 145 | 215 | 285 | 355 |
| 27.5 | 160 | 238 | 316 | 394 |
| 30 | 173 | 260 | 347 | 434 |
| 35 | 202 | 307 | 412 | 517 |
| 40 | 235 | 361 | 487 | 613 |
| 45 | 271 | 421 | 571 | 721 |
Notes for Installers
- To ensure birds cannot enter the roof space, there should be no gap between the bottom purlin and the back face of the gutter after the system has been installed.
- Colorflo 185mm External Fascia and Gutter is not suitable on concrete tile roofs with sloping soffits.
- NOTE: Soffit bearers are required on all hip corners and should be cut back 10 mm.
- The use of concrete tiles on the barge ends is not a recommended practice as highlighted in the NZ Metal Roofing and Cladding Code of Practice Section 2 under Compatibility 2.7.2. Should people continue to use this method then there should be some sort of barrier between the two and there is no warranty offered by Pacific Coil Coaters or New Zealand Steel for corrosion if this method is used. This means that all installations should have a bottom batten around the edge of the roof line rather than let the concrete tile rest on the fascia.
- Where loose fill insulation is used, the soffit must be blocked off at the top plate to prevent the insulation coming into contact with the metal fascia.
- Zincalume coated gutters should have a minimum fall of at least 1:500 and should not have permanent ponding. Check with your nearest distributor for further details.
Dimond coated steel fascia systems are available in 147mm and 185mm high panel, roll formed in 0.55mm BMT zincalume with a prepainted finish only. Unpainted zincalume product, copper, stainless steel and aluminium are not available.
The outer edge of the soffit lining is retained at the bottom of the fascia in a rolled groove.
Design Instructions
- Shingle Roof - When installing Fascia rafter brackets over ply on top of the rafters the set out dimensions are
Dimensions "B" | |
147 Fascia Panel | 145 |
185 Fascia Panel | 175 |
Using these dimensions allows for a 10-12mm gap between the fascia and underside of the ply
- Brackets are nailed or screw fixed to the soffit bearer or rafters when sloping soffits are used.
- The recommended set out heights must be maintained to avoid birds and vermin entering the roof space.
- Steel products should not come into contact with concrete and must avoid dissimilar metal contact.
- When selecting the gutter to use with the fascia system it is important to:
i) Consider the catchment area draining into the gutter (called flow load) to ensure the capacity of the gutter (called flow capacity) has not been exceeded.
ii) Ensure the gutter with bracket can physically fit onto the fascia vertical face, laid to a fall of a minimum 1:500 and give an acceptable appearance. If not, select another smaller gutter size.
Construction Instructions
Selection of metal fascias needs to be made before the trusses are manufactured as the set out dimension may vary between the different systems available.
- Builders must ensure the timber soffit bearers are correctly set out using the published guidelines for the roof type being used prior to the fascia installation.
- Fascia brackets are nailed or screwed onto the soffit bearers to a level and true alignment using a string line.
- 6m maximum length of fascia are then fitted to the fascia brackets, cut back in length where necessary, and lengths joined together using normal roofing practice with silicone sealant and 4mm diameter rivets at 150mm maximum centres. Corner soakers are fitted over the fascias and rivetted on to cover corner joints.
- Metal fascia are specialised system that require specialised installers. Metal roofers do not normally install fascia. We do not recommend, support or approve DIY installations. Specialist companies throughout New Zealand install Dimond fascia. Contact Dimond for a list of installers in your area. Phone 0800 DIMOND (0800 346 663).
