Chloe Zhang
Plastic roof cladding is a popular choice for those looking for a long-lasting and low-maintenance roofing solution. It is lightweight, strong, and easy to install, making it an attractive option for DIY enthusiasts. The versatility of plastic panels allows them to be used in various applications, from garden sheds and patios to agricultural greenhouses and decks. This guide will provide an introduction to the process of fitting plastic roof cladding, covering essential steps, tips for proper installation, and the materials required to ensure a durable and weather-resistant finish.
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What You'll Learn
Choosing the correct thickness
Choosing the right thickness of plastic roof cladding is critical to the strength and longevity of your roof. Polycarbonate sheets come in a variety of thicknesses, ranging from 0.4mm to 15mm or more, depending on the manufacturer and specific product. Thinner sheets, such as 6mm and 10mm twin-wall polycarbonate, are more cost-effective but may require rafter support at narrower centres. On the other hand, thicker sheets provide more strength and durability but are more expensive and may require longer, specialised fixings.
The thickness of the sheets will depend on the type of structure and the expected use. For example, thicker sheets are recommended for structures with frequent residential use, such as conservatories, with common variations including 25mm, 32mm, and 35mm polycarbonate sheets. For commercial roofing and skylights in areas with high rainfall, a solid flat sheet thickness of 6mm or above is recommended to reduce noise and prevent resonance.
When selecting the thickness of your plastic roof cladding, consider the weight that the frame can support. Thicker sheets will require a stronger frame to bear the load. Additionally, the spacing between rafters will impact the required thickness of the sheets. If you use a wider spacing, such as 24", thicker sheathing material may be necessary to prevent sagging.
The choice between solid and twin-wall polycarbonate sheets will also affect the thickness you choose. Solid sheets, being heavier, should be thinner, typically ranging from 3mm to 6mm. In contrast, twin-wall polycarbonate sheets provide better insulation and structural rigidity, with thicknesses ranging from 4mm to 25mm.
Finally, the location of your project and the pitch of the roof should be considered. Thicker sheets are generally recommended for exposed areas to provide more strength and durability. However, it's important to note that narrower sheets are easier to install, especially when fixing them with glazing bars. Therefore, choosing thicker sheets at narrower widths, along with strong rafters, can provide a good balance between strength and ease of installation.
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Cutting the plastic sheets
Cutting plastic sheets is a straightforward process, but it requires careful planning and the right tools. Here is a step-by-step guide:
Step 1: Prepare the Sheets for Cutting
Place the plastic sheet across sawhorses, ensuring it is stable and secure. If the sheet wobbles, use clamps to hold it in place. This step is crucial to ensure a straight and precise cut.
Step 2: Choose the Right Cutting Tool
The type of cutting tool you use will depend on the thickness and quality of the plastic sheet. For thinner sheets, a simple pair of garden shears or scissors may suffice. However, for thicker or higher-quality sheets, a fine-toothed saw is recommended. A high RPM circular saw with a fine-tooth blade (such as a 140-tooth blade) is an excellent choice for most plastic sheets.
Step 3: Cut with Precision
When using a saw, cut slowly and do not force the tool. This will help you achieve the cleanest and straightest cuts. If you need to make special cuts or intricate details, you can use tin snips or a fine-toothed handsaw. Always follow the manufacturer's instructions for the specific product you are using.
Step 4: Safety First
When cutting plastic sheets, it is important to take the necessary safety precautions. Wear gloves and safety glasses to protect yourself from any debris or sharp edges. Additionally, if you are drilling or cutting, it is recommended to wear a filter mask to prevent inhalation of any plastic particles.
Step 5: Consider Pre-drilling and Fasteners
While not directly related to cutting, it is worth mentioning that pre-drilling holes for fasteners can make the installation process easier. These holes should be eight to ten millimetres in diameter and slightly larger than the fasteners to allow for thermal expansion. Use special roofing fasteners with a waterproof seal to prevent leaks.
Remember to adapt these steps as needed based on the specific requirements of your roofing project and always refer to the instructions provided by the manufacturer of your plastic sheets.
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Installing purlins
Step 1: Spacing and Alignment
Before installing purlins, it is important to determine the correct spacing and alignment. Purlins should be spaced no further than 1.2 meters apart when using sheeting with a thickness of 0.7mm and 1 meter when using 0.5mm sheeting. For corrugated roofing, the purlins should not be spaced more than 36 inches apart. The spacing will ensure that the weight of the roofing sheets is adequately supported.
Step 2: Preparing the Purlins
Prepare your purlins by cutting them to the required length. Purlins can be joined together by slotting one section inside another or by using short sleeves for longer sections. Ensure that the purlins are straight and true, as any warping or twisting could affect the final roof cladding.
Step 3: Installing the Purlins
Attach the purlins to the roof trusses, ensuring they are level and correctly aligned. Use appropriate fixings and spacers to secure the purlins in place. Check that the purlins are firmly attached and can bear the weight of the roofing sheets.
Step 4: Inspection and Adjustment
Once all the purlins are installed, conduct a thorough inspection to ensure they are correctly spaced, aligned, and level. Make any necessary adjustments if you spot any errors. This step is crucial, as incorrect purlin installation can render the roofing sheets useless and cause damage.
Step 5: Additional Considerations
For a quieter roof, install noise reduction tape to all the purlins before installing the sheets. This will minimize the noise created by the expansion and contraction movement of the sheets. Additionally, painting the tops of the purlins white can help prevent heat build-up.
By following these steps, you will be able to successfully install the purlins for your plastic roof cladding, providing a strong and secure framework for the rest of the installation.
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Using the right fasteners
When fitting plastic roof cladding, it is important to use the right fasteners to ensure a secure and attractive finish. The type of fastener you use will depend on the type of corrugation and understructure material. Typical fasteners include weatherproof nails or wood screws with neoprene washers, self-tapping screws, and grommet-type fasteners. It is recommended to use special roofing fasteners rather than standard screws, as they have a waterproof seal underneath the head that prevents leaks.
If you are using screws, it is important to space them evenly apart. Screws should be placed near the edges of the roof panels, both vertically and horizontally. For horizontal placement, screws should be placed every six to eight inches apart, and for vertical placement, they should be placed every two feet.
When installing corrugated roofing sheets, the fasteners should always be fixed on the corrugation crests. In multi-panel runs, the number of fasteners can be reduced at mid-purlins unless conditions demand otherwise. The remaining fasteners should be evenly positioned, adjoining the main corrugations of the specific panel.
To make the installation process easier, it is recommended to drill the holes for the fasteners in advance. The pre-drilled holes should be eight to ten millimeters in diameter and two millimeters wider than the fasteners to allow room for expansion when the roof is exposed to heat. You can use a stick with a hole drilled in it as a guide, and it is easier to drill from what will be the underside of the roof.
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Weatherproofing and sealing
Pitch of the Roof:
The roof should have a minimum pitch of 10 degrees or one inch per foot to allow for proper water drainage. If your roof has a shallower pitch, consider additional weatherproofing measures, such as using gutters to manage rainwater effectively.
Overlapping Panels:
When installing the roofing panels, ensure they overlap by about 3 to 4 inches (7.6 to 10.2 cm). This includes overlapping the trims and caps by the same amount. The overlap helps create a durable seal and protects against leakage and air infiltration.
Sealant Application:
Once you've installed the panels and overlapped the seams, seal any visible seams with a suitable sealant. This step ensures that the joints are watertight and prevents leaks. Follow the manufacturer's instructions for the specific sealant you are using.
Flashing:
Use flashing, or edging, to improve the seal, especially if your plastic roof adjoins another building. Install the flashing on the eaves of the roof, allowing it to overhang any gutters by about 0.25 inches (0.64 cm). Overlap each section of flashing by 0.25 to 0.5 inches (0.64 to 1.27 cm) and apply a line of caulk to the edge of the bottom flashing to seal it.
Fasteners and Screws:
Use special roofing fasteners with a waterproof seal underneath their heads to prevent leaks. Aim to place the fasteners at the high point of every fourth corrugation. Pre-drill the holes for the fasteners to ensure a neat finish. For added security, use screws near the edges of the roof panels, both vertically and horizontally, spaced about 6 to 8 inches apart horizontally and 2 feet vertically.
Drip Edge:
Install a drip edge to protect the roof's edges from water damage. The drip edge guides water away from the structure, helping to prevent water damage to the roof.
By following these steps, you can effectively weatherproof and seal your plastic roof cladding, ensuring a long-lasting and durable roof.
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Frequently asked questions
Some types of plastic sheets can be cut using garden shears or scissors, but for others, you may need to use a fine-toothed saw or a high RPM circular saw. If you need to make special cuts, you can use tin snips or a fine-toothed handsaw. Remember to wear gloves and safety glasses when cutting.
Corrugated plastic sheets typically range in thickness from 0.6mm to 2.0mm. For a balance between price and performance, 1mm thick sheets are recommended. Thinner sheets may be flimsy, while thicker sheets are more rigid but less flexible.
It is recommended to start installing the sheets from the bottom up and work your way to the left or right. Overlap the sheets by about 3-4 inches as you install them, and use roofing fasteners or screws to secure them in place. Pre-drill holes for the fasteners to make installation easier, and seal any seams with sealant tape or closure strips.
