Flat Roof Design Information
Fixing Details
For Non-Cyclonic Areas
Two 12 x 20mm self drilling screws per pan at each support and two 3.2mm sealed aluminium rivets per pan at the back channel. If decking runs parallel to the back channel, secure to channel with rivets at maximum 200mm centres. All screws are to have neoprene washers.
For Cyclonic Areas
Three 12 x 20mm self drilling screws per pan at each support. For deck spans less than 3600mm, two self drilling screws per pan are to be used on fascia beam. Three 4.8mm sealed aluminium rivets per pan (or 150mm centres if sheets are parallel) to be used at the back channel. All screws are to have neoprene washers.
Roof Sheeting
Stratco Roof Deck
Polycarbonate Panel - Stratco Rooflite
Structural Sections
Design Considerations
Gable Units Attached Between a Flat Unit and an Existing Structure
Gable Units which are attached between a Flat Unit and an existing house, shall only be considered attached if the Gable Unit is attached to the existing house (C) for its full length (L) and the longest side of the combined unit (B) does not exceed twice the Gable length (L). The Flat Unit in this case can be considered attached. This style requires all coloumns to be embedded into footings.
Gable Units Attached to Flat Unit One or Both Sides
Gable Units which are attached one or both sides to Flat Units must be attached to an existing house for at least 75% of the gable opening length (O) to be considered attached. Flat Unit/s must be deemed attached as detailed in the Flat Unit section below to allow the Gable Unit to be considered attached.
Gable Units are considered attached both sides if both Flat 1 and 2 comply with attachment rules for Flat Units as detailed below. Gable Units are considered attached one side if only one Flat Unit exists and it complies with the attachment rules for Flat Units as detailed below.
Flat Units
A Pergola, Patio or Carport is deemed to be freestanding unless it is attached to an existing house (C) for at least 75% of the length of its shortest side (A), and its longest side (B) does not exceed twice the length of its shortest side.
Design Options
When designing a Pergola, consideration should be given to both roof sheet direction, and the orientation of any openings and overhangs involved. These are often determined by appearence and drainage requirements. The following chart shows some of the normal options used, but contact Stratco if assistance is required.
| Gable Pergola |
| Attached to Flat Unit One Side & Wall or Fascia One End |  |
| Attached Both Sides to Flat Unit & Wall or Fascia Opposite Side |  |
| Attached to Flat Unit Both Sides & Wall or Fascia One End |  |
Flat Roof
Choosing a Design
Available as either a freestanding structure or attached to the home the Stratco Flat Roof can be used as a pergola, patio or carport. With the addition of the Stratco Rooflite™ you can supply filtered light to the underside. The beams can span up to 8.4 metres and are available in either 120mm or 150mm sizes.
There are four configurations to choose from. Type One has a 4.5 metre maximum span and only requires an outside beam to support the structure, although most units use perimeter beams on all sides to provide the best appearance. Type Two is the same, but with an overhang at the front to increase the span to 5.1 metres. Type Three has support beams across the span so the roof sheets can run horizontally for a different appearance. Type Four has extra support beams and a purlin through the middle to give it a span of 8.4 metres.
Uncomplicated by design, the Stratco Flat Roof is the ideal do-it-yourself project, with everything supplied as a package and all the assembly instructions provided.
Invest In Quality
Available in a wide range of high gloss colours to complement your home, the Stratco system utilises the unique Stratco Roof Deck, a steel roofing sheet with a smooth underside that has a 'ceiling-like' finish. It can span up to 4.5 metres, allowing the support beams to be placed well apart for a clean, uncluttered finish. The structure is formed with strong and elegant, chamfered and fluted beams and columns. Matching gutters tie the system together, while hidden fixing points and concealed brackets complete the smooth and refined appearance.
The durable Stratco Patio or Carport will be a lasting investment. It is protected by a fifteen year structural guarantee (conditions apply) and, when installed by an Authorised Stratco Dealer you are covered by a one year installation guarantee. The Stratco range has been engineered and tested to comply with all relevant New Zealand Standards. The major components are made from strong high tensile steel, while the fixings and brackets are galvanised for a long useable life.
3D Design Visualisation
Have a 3D visualisation of your new Stratco Pergola designed using our Pergola Design Software. Let us help you see what a difference a Stratco outdoor living solution can make to your home.
