Polycarbonate roof sheets are durable, lightweight, and known for high light transmission. They come in various thicknesses (typically 4mm to 25mm) and offer good insulation. However, they can scratch easily, yellow over time due to UV exposure, and require proper support and sealing during installation. Maintenance includes regular cleaning and UV protection. Alternatives include glass, acrylic, and metal roofing materials.

Aspect	Information
Material	Polycarbonate (a thermoplastic polymer)
Thickness	Typically ranges from 4mm to 25mm (thicker options available)
Common Uses	Roofing, skylights, greenhouse panels, carports, and more
Strength	Impact-resistant, strong, and durable
Transparency	High light transmission, often used for natural lighting
UV Resistance	Vulnerable to UV damage (UV-resistant options available)
Insulation	Provides good insulation properties
Weight	Lightweight compared to glass
Installation	Requires proper support structure, fasteners, and sealing
Pre-Drilling	Recommended to pre-drill holes before attaching
Walking	Should not be walked on to prevent damage
Thermal Expansion	Expands and contracts with temperature changes
Overhang	Typically has an overhang of 300mm to 450mm
Span	Spacing between supports typically 600mm to 900mm
Slope	Minimum slope of about 5 degrees for proper drainage
Color Options	Clear, tinted, and colored sheets available
Maintenance	Regular cleaning and UV protection may be needed
Lifespan	Can last 10-25+ years with proper care and maintenance
Disadvantages	Susceptible to scratching, yellowing over time, and UV damage
Alternatives	Glass, acrylic, metal roofing, traditional roofing materials
Cost	Cost varies based on thickness, size, and brand

FAQs

How many polycarbonate sheets do I need? The number of polycarbonate sheets you need depends on the size of your project and the dimensions of the sheets. To estimate, measure the area to be covered and divide it by the area of one sheet.

What thickness solid polycarbonate should I use for the roof? For a typical residential roof, a thickness of 10mm to 16mm is often used. Thicker sheets offer more insulation and strength.

How do you calculate square meters for roofing sheets? To calculate square meters for roofing sheets, measure the length and width of the area you plan to cover and multiply the two dimensions together.

How far can polycarbonate roofing span? Polycarbonate roofing sheets can span a distance of approximately 600mm to 900mm between supports, depending on the thickness and specific product. Beyond this span, they may sag or lose structural integrity.

Do you need to pre-drill polycarbonate roofing? Yes, it’s recommended to pre-drill holes in polycarbonate roofing sheets before attaching them to prevent cracking. Use a drill bit slightly larger than the screw diameter.

What is a major disadvantage of polycarbonate sheets? One major disadvantage is that polycarbonate sheets can scratch easily, reducing their clarity and aesthetics over time.

Is 4mm polycarbonate OK for the roof? 4mm polycarbonate is relatively thin and may not provide sufficient insulation or structural support for a roof. Thicker options are usually better for roofing.

What is the minimum slope for a polycarbonate roof? The minimum slope for a polycarbonate roof is typically around 5 degrees to ensure proper water drainage.

What are the disadvantages of polycarbonate roofing? Disadvantages include susceptibility to scratching, potential for yellowing over time, and the need for proper support and installation to prevent sagging.

What is the formula for roofing calculation? The formula for calculating roofing area is Length x Width. For more complex roofs with different sections, break the roof into smaller rectangles and calculate each separately, then sum them up.

How many square meters is the roof on a 4-bedroom house? The square meterage of a 4-bedroom house roof can vary significantly based on the design and size of the house. As an estimate, it could range from 150 to 300 square meters or more.

How do I figure out how much roofing I need? Measure the length and width of each section of your roof, calculate the area of each section, and then sum the areas together to determine the total square footage of roofing material needed.

Do you need purlins for polycarbonate roof? Purlins or supports are typically needed for polycarbonate roofing, especially for larger spans or to meet local building codes.

How do you screw down polycarbonate roofing? Use screws with rubber or neoprene washers designed for roofing. Pre-drill holes in the polycarbonate sheets and attach them to the supports, ensuring a snug but not overly tight fit to allow for expansion.

Can you walk on polycarbonate roofing? Polycarbonate roofing is not designed for walking on. It can be fragile and may crack or break if walked on.

Does it get hot under a polycarbonate roof? Polycarbonate roofing can get hot in direct sunlight due to its heat-absorbing properties. Proper insulation and ventilation can help mitigate this issue.

Do I need vertical closure strips for polycarbonate roofing? Vertical closure strips may be needed to seal the ends of polycarbonate sheets and prevent debris or insects from getting in. Their use depends on the specific installation.

How much overlap on polycarbonate sheets? A typical overlap for polycarbonate sheets is about 150mm to 200mm (6 to 8 inches) to ensure a watertight seal.

How do you waterproof a polycarbonate roof? Waterproofing a polycarbonate roof involves proper installation with overlaps, sealant at the edges, and using appropriate flashing and closures.

Does polycarbonate crack easily? Polycarbonate can be more impact-resistant than glass, but it can still crack or break upon significant force or stress.

Which color polycarbonate sheet is best? The best color for a polycarbonate sheet depends on your specific needs. Clear sheets allow maximum light transmission, while tinted or colored sheets offer shading and privacy.

What is better than a polycarbonate roof? Alternative roofing materials include glass, acrylic, metal, and traditional roofing materials like asphalt shingles or tiles.

How many screws in polycarbonate roofing? The number of screws needed depends on the size of the sheets and the manufacturer’s recommendations. Typically, screws are spaced about 300mm to 450mm apart along the support structure.

How far apart are polycarbonate roof sheet supports? Supports for polycarbonate roofing sheets are typically spaced 600mm to 900mm apart, depending on the thickness and load-bearing requirements.

What is the purlin spacing for polycarbonate roofing? Purlin spacing can vary based on factors like the thickness of the polycarbonate sheets and local building codes. It’s often between 600mm to 1200mm apart.

Does polycarbonate roofing bend? Polycarbonate roofing can bend to some extent, especially thinner sheets. Proper support and installation can minimize bending.

Are polycarbonate roofs cheap? Polycarbonate roofing materials vary in cost, but they can be more cost-effective compared to some alternatives like glass. However, installation costs can vary.

How thick does polycarbonate need to be? The required thickness of polycarbonate depends on factors like the intended use and load-bearing requirements. For roofing, 10mm to 16mm thickness is common.

What is the minimum slope for water drainage on a roof? The minimum slope for proper water drainage on a roof is typically around 2% or 1/4 inch per foot.

What is the best pitch for a roof? The best roof pitch depends on factors like climate and design preferences. A pitch of 4:12 (18.43 degrees) is a common standard.

Do polycarbonate roofs leak? Polycarbonate roofs can leak if they are not properly installed with adequate overlaps and sealing. Proper installation is essential to prevent leaks.

Does polycarbonate roofing cause condensation? Polycarbonate roofing can cause condensation in certain conditions, especially if not adequately insulated. Proper ventilation and insulation can help reduce condensation.

Does polycarbonate roofing become brittle with age? Over time, polycarbonate roofing can become more susceptible to brittleness and UV damage. UV-resistant coatings can help extend its lifespan.

Can I measure my roof from Google Maps? You can get approximate roof measurements from Google Maps, but for precise measurements, it’s best to physically measure or consult with a professional.

What is a roof pitch calculator? A roof pitch calculator is a tool that helps determine the angle or slope of a roof based on its rise and run measurements.

What is the average square footage of a roof? The average square footage of a roof can vary widely based on the size and design of the structure. It could range from a few hundred to several thousand square feet.

How much do roofers charge per square meter in the UK? Roofing costs in the UK can vary, but as of my last update in 2021, the average cost per square meter can range from £40 to £120 or more, depending on the type of roofing material and complexity of the job.

How much does a flat roof cost per m2 in the UK? The cost of a flat roof in the UK can vary widely based on factors like materials and location. As of 2021, it could range from £40 to £100 or more per square meter.

Can I get a grant for a new roof in the UK? In the UK, there are government grants and programs available for certain roofing and insulation improvements. Eligibility and availability may vary.

How many square meters is a 10×10 roof? A 10×10 roof would have an area of 100 square meters.

How many square feet is an 8×12 shed roof? An 8×12 shed roof would have an area of 96 square feet.

How many square feet is a 12×16 shed roof? A 12×16 shed roof would have an area of 192 square feet.

How do you join polycarbonate sheets? Polycarbonate sheets can be joined using connectors, H profiles, or ridge caps designed for polycarbonate roofing. These accessories help create a watertight seal between sheets.

What is the overhang for a polycarbonate roof? The overhang, if desired, can vary based on design preferences but is often around 300mm to 450mm (12 to 18 inches) beyond the support structure.

What is the rafter span for polycarbonate roofing? The rafter span for polycarbonate roofing depends on factors like sheet thickness and load requirements. Typical spans range from 600mm to 900mm.

Does polycarbonate crack when drilled? Polycarbonate can crack if not drilled properly. It’s essential to use the correct drill bit, apply even pressure, and avoid excessive force.

How do you cut polycarbonate smoothly? Polycarbonate can be cut smoothly using a circular saw with a fine-toothed blade or a specialized polycarbonate-cutting tool.

What causes holes in polycarbonate roof? Holes in a polycarbonate roof can be caused by drilling or puncturing during installation or by impact damage.

Which side of polycarbonate sheet goes up? The UV-protected side of a polycarbonate sheet should face up when installed to protect against UV damage.

How do you secure polycarbonate roofing sheets? Polycarbonate roofing sheets are secured using screws with rubber or neoprene washers. Pre-drill holes and attach the sheets to the support structure.

How do you fasten polycarbonate roofing panels? Fasten polycarbonate roofing panels using screws, ensuring that they are properly seated and not overtightened.

What is the minimum angle for a polycarbonate roof? A minimum slope of about 5 degrees (or 1/12 pitch) is often recommended for polycarbonate roofing to ensure proper water drainage.

How do you bond two pieces of polycarbonate? Two pieces of polycarbonate can be bonded using compatible polycarbonate adhesives or sealants.

What is the expansion gap between polycarbonate sheets? An expansion gap of about 3mm to 6mm (1/8 to 1/4 inch) is recommended between polycarbonate sheets to allow for thermal expansion and contraction.

Can you double up polycarbonate sheets? You can double up polycarbonate sheets to increase insulation or strength, but proper support and installation are essential to prevent sagging.

Should I seal the ends of polycarbonate sheets? Yes, sealing the ends of polycarbonate sheets with appropriate closures or tapes helps prevent dust, debris, and moisture from entering.

Can you pressure wash polycarbonate roof? It’s generally not recommended to pressure wash a polycarbonate roof, as high pressure can damage the sheets. Use a gentle wash with a garden hose instead.

Does polycarbonate break down in the sun? Polycarbonate can be susceptible to UV damage over time, which can cause it to become brittle or discolored. UV-resistant coatings can help mitigate this.

What can destroy polycarbonate? Polycarbonate can be damaged by excessive UV exposure, scratching, harsh chemicals, or high impact forces.

Does white polycarbonate turn yellow? White polycarbonate can yellow over time due to exposure to UV radiation. UV-resistant white polycarbonate is available to reduce yellowing.

Does all polycarbonate turn yellow? Not all polycarbonate will turn yellow, but it can be susceptible to yellowing over time with UV exposure.

What is a cheaper alternative to polycarbonate? A cheaper alternative to polycarbonate for roofing might be corrugated fiberglass or certain types of acrylic.

Is thicker polycarbonate better? Thicker polycarbonate generally provides better insulation and structural strength, making it suitable for some roofing applications.

How do I calculate how many roof screws I need? To calculate the number of roof screws needed, determine the spacing required (as per the manufacturer’s instructions) and multiply it by the total length of the roofing panels.

Do you need closure strips for polycarbonate roofing? Closure strips are often used to seal the ends and edges of polycarbonate roofing sheets for proper installation.

How much support does polycarbonate need? Polycarbonate roofing requires adequate support, including purlins and rafters, to prevent sagging and maintain structural integrity.

What thickness polycarbonate should I use for the roof? For roofing, a thickness of 10mm to 16mm is common, but the specific thickness depends on factors like span and load requirements.

What is the spacing for rafters for 10mm polycarbonate roofing? The spacing for rafters when using 10mm polycarbonate roofing typically ranges from 600mm to 900mm, depending on local building codes and design considerations.

Can you walk on polycarbonate roofing? Polycarbonate roofing is not designed for foot traffic and should be avoided. Walking on it can cause damage.

Does polycarbonate roofing become brittle with age? Over time, polycarbonate roofing can become more brittle due to UV exposure. UV-resistant coatings can help extend its lifespan.

Does it get hot under a polycarbonate roof? Polycarbonate roofing can get hot in direct sunlight due to its heat-absorbing properties. Proper insulation and ventilation can help mitigate this issue.

What is better than a polycarbonate roof? Alternative roofing materials include glass, acrylic, metal, and traditional roofing materials like asphalt shingles or tiles.

Is 4mm polycarbonate OK for the roof? 4mm polycarbonate is relatively thin and may not provide sufficient insulation or structural support for a roof. Thicker options are usually better for roofing.

How strong is 12mm polycarbonate sheet? A 12mm polycarbonate sheet is relatively strong and can withstand moderate impacts. However, specific strength can vary depending on the manufacturer and product.