Design Instructions
- The set out of the fascia support brackets are shown in the construction details in Section 3.4.4 of the Dimond Roofing & Cladding Technical Manual.
- Level or sloping soffits up to 22.5° pitch can be used.
- When installing Fascia rafter brackets for a shingle roof over ply on top of the rafters the set out is
Fascia | Dimension "B"* |
|---|---|
147 Fascia Panel | 145 |
185 Fascia Panel | 175 |
Using these dimenstions allows for a 10-12mm gap between the fascia and underside of the ply
* Refer Installation Instructions for the location of Dimension “B”
- 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. Refer to Section 3.1.4 for the method.
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 riveted 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.
