How important is it to follow the PSP Suntuf general recommendations on product usage?
Very important. Recommendations for the storage, installation and general treatment of Suntuf sheets are drafted to ensure that the product’s quality and serviceability is met to full extent, and following these recommendation ensures that product warranty isn't void.
Do I really need to buy the PSP Suntuf recommended closure strips and screws for corrugated panels?
Yes. PSP Suntuf products are a system that is meant to provide the best possible installation. Proper use of the complete system (sheets, closure strips, fasteners, etc.) greatly reduces the possibility of problems and insures that product warranty will be honoured.
Can I use silicone to seal Suntuf?
Silicone sealers and adhesives can be used if they are the neutral cure type, also check on the tube if they are compatible with polycarbonate plastics.
Why do I have to pre-drill fastener holes in roofing with corrugated panels?
Pre-drilling the holes insures the panels will have room to expand and contract properly with temperature change. Skipping this step can lead to distorted or warped panel.
How many fastening options are there? And what is best for my installation.
The PSP Suntuf fastening range covers all options, from the self-drilling and expansion hole cutting SupaDrive Multi to the basic Suntuf DIY roof fasteners and wall fasteners. Available in galvanised and Stainless Steel finishes. For those high wind areas we provide a fastener that have a pre fitted metal contoured storm washer, this fattener is also designed for use with the Suntuf Skylighting sheets.
Do Suntuf sheets keep the "heat" out?
To a certain extent! Standard Suntuf sheets are available in a variety of colours each with its own heat and light transmission properties. While all Suntuf sheets block 99.9% of harmful UV radiation, there are variations in heat and light transmission. Clear sheets allow most solar light and heat through while opaque colours are more reflective. In cases where excessive heat build-up is a concern, we offer CoolTech™ tints that outperform conventional 'light to heat ratio', such as CoolTech Ice™ & CoolTech Grey™. For more information go to the CoolTech™ page.
How long do Suntuf Sheets last?
Suntuf has a lifetime warranty that covers light transmission for 25 years and hail & breakage for 15 years
The actual life expectancy can be as much as 30 years +, depending on professional installation practice and environmental factors like air pollution, winds, and erosion by sand particles etc.
How do I cut Suntuf sheets?
Suntuf sheets may be cut with either a circular saw (using a very fine blade, e.g. Irwin Marathon PVC blade.) or a fine bladed jig saw. For best results it is often better to cut a few sheets at a time to reduce vibration. Sheets may also be cut by hand by carefully using tin snips, heavy duty scissors or a utility knife. For further information please refer to the Suntuf installation manual.
What should I use to clean my panels?
Warm water with a mild household detergent should be sufficient to clean SUNTUF sheets. Wipe off any remained dirt with a soft cloth and wash again. Water blasting is also suitable only when the nozzle is kept at least 500mm from the sheet. NEVER use a solvent based cleaners (ammonia, etc.). NEVER wipe the sheets when dry. AVOID using sponges or brushes that can scratch the sheets surface.
My building inspector says I need to know your flame spread rating. Can you provide this information?
Yes. We can provide test reports and other such documents. Please contact your local PSP office if you require this data.
Do Suntuf Flashing accessories come in all of the same colours as the sheets?
No. Suntuf flashing accessories are only available in clear, when installed over coloured or tinted sheets they will take the colour of the underlying sheet.
In roofing with corrugated panels, what are purlins?
Purlins are cross members running across the rafters of your structure.
In roofing with corrugated panels, where should I start?
You can choose to install left to right, or right to left, or start at the middle and continue to both sides.
It is recommended to Always advance against the dominant wind at the site.
Never start at both sides, or at any two separate points.
In roofing with corrugated panels, should I insert screws at valley or crest points?
Crest fixing always.
Is it OK to fix screws by a power drill or screwdriver?
Adjustable electric drill or screwdriver are allowed, provided you set the torque to the minimal needed, in order to prevent over-tightening and local deformation of the panel.
Is it OK to walk over roofing sheets while in storage, during or after installation?
No. use crawling boards placed above the purlins and follow all current safety practices.
What is the weight of typical Suntuf panels?
SUNTUF® 76/18 Corrugated Iron
Thickness - 0.8mm
Area weight - 1.08Kg/m2
SUNTUF® 76/18 Corrugated Greca
Thickness - 0.8mm
Area weight - 1.20Kg/m2
Note: contact your local PSP office or visit the www.suntuf.co.nz website for additional sheet profiles and data.
How should I store packed Suntuf sheets?
Store packed sheets in a protected, shaded, ventilated site, with no direct exposure to sunlight and winds. In outdoor temporary storage cover with opaque protective film, and avoid PVC films and heat-absorbing materials.
Note: Surface protective films that cover sheets are highly sensitive to heat and direct sunlight. Excessive heat and direct sunlight before taking off the film can cause gluing of that film to the sheet surface, after which it will not be practically possible to remove it from the sheet!
Why is there a printed strip on the top side of Suntuf sheets and should I peel it off?
The printed masking strip on Suntuf sheets, is an identification marker - this way up notice and general information list, used to carry important information to the installer and final customer.
The indication of the UV protected side that should be installed facing outwards is extremely important.
It is recommended to peel off the information strips and labels only after installation. In case this will not be feasible and the film will be peeled off before laying the sheets, it must be remembered to at least mark the UV protected surface, so that the sheet will not be installed upside down.
Note: wrong installation damages are not covered by the Suntuf warranty.
Please also note: Information films that are attached to the sheets are highly sensitive to heat and direct sunlight. Excessive heat and direct sunlight before taking off the film can cause gluing of the film to the sheet surface, after which it will be practically impossible to remove it from the sheet!
Can the Suntuf sheets be curved?
Yes. Sheets can be cold-curved and serve in arched shapes, provided the relevant Suntuf specifications for minimum radius in cold curving are followed. These specifications can be found in the Installation Instructions of the relevant sheets. Corrugated sheets can be arched so that the corrugations themselves are curved (lengthwise).
Curving is not recommended across the ribs direction.
Can these sheets catch fire?
Yes. In principle all plastic materials are flammable, and will catch fire in presence of exterior flame.
The ignition temperature of polycarbonate sheets is 490ºC (915ºF) Polycarbonate materials are self-extinguishing, and fire will decay when the exterior flame source is removed.
Do the sheets expand in heat?
Yes. Plastic sheets expand with heat, and shrink with cold.
Being a thermoplastic, Polycarbonate demonstrates an expansion/contraction characteristic, causing a change in dimensions. The use of enlarged screw holes in corrugated sheets are standard methods that should be followed. Always use the guidelines in the Suntuf installation instructions.
Example: A 5 meter long SUNTUF sheet will add up 3.25mm when the temperature is raised by 10ºC.
Do Suntuf Polycarbonate roofing sheets really block UV radiation?
Yes .Polycarbonate sheets are practically opaque to UV radiation, making them a perfect barrier against this harmful radiation. Suntuf Sheets do let in good radiation the type that promotes plant growth, therefore a perfect greenhouse product.
If polycarbonate sheets block UV radiation, why is there a ‘UV side’ to face outwards?
Suntuf Polycarbonate blocks UV radiation by absorbing it. This absorption mechanism might degrade the material, and the sheet has to be protected against it. Protection to the sheet is achieved by coating it with a special material that converts the UV radiation into heat that emits to the external air layer.
In order to protect the sheets, they must be installed with the marked UV protective layer facing outside.
Should I paint the topside of structural rafters and purlins with any paint?
Yes, but be sure to paint only with light or white colour.
Do not use dark colours like black or brown that can absorb and reflect intensive heat, causing scorching on the underside of the sheets.