This is almost certainly due to condensation buildup on the underside of the panels. The condensation that forms is not a direct result of the Suntuf panels, but rather the surrounding environment in which the panels are installed.
To learn what condensation is, why it occurs, and a few suggestions that can help minimize it, click here to download Palram Tech Brief #5007.
The new guidelines by manufacturers of ACQ lumber call for heavily galvanized or stainless steel fasteners due to the corrosive nature of the ACQ treatment.
You have two basic options for using Palram products with ACQ lumber:
- Use a comparable fastener made from an ACQ approved material. Make sure that such a fastener uses either a neoprene or EPDM washer, and that it is installed per Palram’s recommendations.
- Use Palram’s fasteners. Initial tests with ACQ have shown no adverse effect on our fasteners. This is added to the fact that the fasteners are being used to secure a light weight plastic panel (rather than connect structural members). If you use Palram fasteners, our 10 year warranty will still apply.
DynaGlas branded products are engineered specifically for commercial greenhouse applications. Panel widths, thicknesses, pigments, and special greenhouse-specific features (such as guaranteed condensate control) are consistent with commercial growers' needs.
Aside from commercial greenhouse-specific features, DynaGlas is the same as Suntuf (for equal thicknesses, weights, corrugation profiles, and panel widths). Outside of North America, Palram uses the Suntuf brand instead of DynaGlas.
ThermaGlas branded products are engineered specifically for commercial greenhouse applications. Panel widths, thicknesses, pigments, and special greenhouse-specific features (such as guaranteed condensate control) are consistent with commercial growers' needs.
Aside from these commercial greenhouse-specific features, ThermaGlas is the same as Sunlite (for equal thicknesses, weights, and panel widths). Outside of North America, Palram uses the Sunlite brand instead of ThermaGlas.
Yes, you can paint structural rafters or supports – but be sure to paint only with light or white color. Do not use dark colors like black or brown that can absorb and reflect intense heat.
No. These tapes, used on Sunlite and ThermaGlas products, are for packaging/storage only, and are not strong enough for field service.
After installing multiwall sheets, seal the top end with aluminum foil solid tape, and the bottom end with special ventilating breather tape.
Most Palram polycarbonate products feature a very thin co-extruded layer of UV-resistant resins that protect the entire sheet from UV radiation. In most cases, UV protection is applied to one side. However, two-sided UV protection is available for select products.
Polycarbonate inherently blocks UV radiation by absorbing it and not allowing it to pass through the panel. However, UV also degrades polycarbonate over time. Therefore, Palram adds additional UV protection specifically to protect the sheet, not to block additional UV from getting through the sheet.
To ensure the protection of single-sided UV protected sheets, they must be installed with the marked UV protective layer facing out toward the sun. Although sheet products can also be UV protected on both sides, most of the sheets are protected on one side that is marked clearly.
Some of them do. Rigid PVC and polycarbonate sheets are practically opaque to UV radiation, making them a perfect barrier against this harmful radiation. They actually block UV-A and UV-B radiation better than nearly any sunscreen lotion.
On the other hand, acrylic roofing sheets (which are not produced by Palram) generally transmit a considerable portion of the UV radiation.
Review the technical datasheet for each Palram product for specific UV information.
The protective films in flat (non-corrugated) Palram sheets are for protection against dirt and scratching during the long journey from manufacturing to the job site. In some cases, the film also carries important installation and other product information.
The film will also indicate which side is UV-protected. This side should be installed facing outwards (extremely important).
In most cases, we recommend peeling off the protective films after installation. If this is not possible for practical reasons, always mark the UV protected surface, if there is one, so that the sheet will not be installed upside down.
Important note: The protective films that cover Palram 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 be extremely difficult to remove it from the sheet.
Under no circumstances should you walk, stand or kneel directly on roofing sheets! The risk of breaking the sheets and falling is too great.
If you can't avoid accessing the roof area during installation, always use a crawl board that is strong enough to support the weight of the person. The crawl board must span at least three supporting roof rafters or purlins.
Crest fastening is almost always preferred, but some of our corrugated products do require fastening in the corrugation valley. See the individual installation guide for each product to see specific instructions.
It depends mostly on access to your roof. You can choose to install left to right, or right to left, or start at the middle and continue to both sides.
However, never start at both sides toward the middle, or at any two separate points.
Most importantly – always overlap the panels in such a way so that the wind cannot get under the ends of the panel. This can cause "uplift" and, depending on wind speed, can actually pull the panels off the roof.
Warm water with a mild household detergent should be sufficient to clean Suntuf or Sunlite panels. Gently wipe off any remaining dirt with a soft cloth and wash again.
Never use a solvent-based cleaner (ammonia, etc.), and avoid abrasive sponges or brushes that can scratch the panels surface.
We do not recommend painting our polycarbonate panels. Polycarbonate is a very resilient material, but it is potentially sensitive to chemicals contained in many exterior paints. While we can test a paint for compatibility, we have no way of controlling whether a paint manufacturer will remain consistent with their formulas over time.
Palram products are available in a variety of colors, which varies by product. Each has its own heat and light transmission properties. While all Palram panels block virtually 100% of harmful UV radiation, there are variations in heat and light transmission.
Clear panels allow the most solar light and heat through, while lighter, opaque colors are more reflective. If excessive heat buildup is a concern, our "Solar Control" panels are your best bet. Please see each product page for more information on color offerings, light transmission percentages and warranty terms.
For hobbyists and homeowners, our sister company, Palram Applications, offers easy-to-assemble greenhouse kits. These products are available through many online stores and select garden centers throughout North America.
If you plan to design and build your own home structure, consider our Suntuf corrugated polycarbonate panels or Sunlite multiwall panels. Suntuf is widely available at Home Depot's throughout North America, as well as many independent retailers. Sunlite is available at select Home Depot's and some independent retailers.
For commercial applications, our DynaGlas and ThermaGlas panels are a great choice. DynaGlas and ThermaGlas are available from commercial greenhouse manufacturers and greenhouse supply distributors. Contact our Master Distributor, Green-Tek, for a dealer near you.
You can also contact us with your specific needs and we'll help you make the best decision for your application.
Corrugated and multiwall panels may be cut with a circular saw (using a very fine-toothed blade made for plastic panels, veneer or plywood). For best results, it is often better to cut just a few corrugated panels at a time to reduce vibration. Clamping the panels also helps. (But be careful clamping multiwall to avoid compression.)
If using a standard circular saw blade, better results may be seen by running the blade backwards (remove and turn it over to reverse direction). Depending on thickness, some panels may also be cut by hand by carefully using tin snips or a utility knife.
For other cutting instructions and further details, please visit each product's document page. You can also view our general Corrugated Products Installation Overview video.
The best way is to use Palram-recommended screws fastened through pre-drilled holes that are slightly larger than the diameter of the screw. Pre-drilling insures that the panels will have room to expand and contract properly with temperature change. Skipping this step can lead to distorted or warped panels.
Whatever you do, never use nails. Unlike wood fibers, which compress when a nail is hammered in, Palram's rigid PVC and polycarbonate panels do not compress. That means there is significant risk of cracking and impact damage in the area of the attachment. Also, nailing the panels in place prevents them from safely expanding and contracting with temperature change, resulting in warping of the product.
For exact hole size guidelines and other important installation instructions, see the documents at the bottom of each specific product's web page.
First, do not use adhesives or caulks that contain silicone when working with PVC.
If waterproofing is your primary concern, use a PVC-specific caulk/sealant. Unlike adhesives, PVC caulks are meant to fill gaps and create a water-resistant seal between materials.
If bonding is more important, don't use PVC pipe glue, which is often colored blue. Instead, choose a PVC-to-PVC adhesive such as Weld-On 705, OSI Quad, Christy’s Red Hot or PVC TrimWelder.
First off, don't use PVC cement. PVC cement and polycarbonate do not react well. Also, generally speaking, Suntof/Suntop panels are not recommended to be "glued" together. For sealing polycarbonate, use a 100% silicone caulking.