As per our Shipping and Returns Policy, custom cuts and fabricated parts are non-returnable. If you need an over- or undersized item, note it under "Comments" during Checkout. Cut-to-size orders have an acceptable cut tolerance of 1/8" (0.125"), so clarify if the adjustment is to be made on the (+) or (-) side of the saw blade.Please review our full return and shipping policy here.
Measure Twice, Cut Once
Since custom cuts and fabricated parts are non-refundable, be very careful while measuring your dimensions. As each cut is nominal, even the slightest miscalculation could be costly.
How to Use a Measuring Tape
Extend your tape measure several inches to find the 1 and 2 inch markers. In between the inch markers you’ll find 16 equally spaced tick marks.
Measure by counting the increments beyond the nearest inch. As the increments decrease, so does the length of the mark. For example, 1/2" has a bigger mark than 1/4" which has a bigger mark than 1/8". The smallest mark follows at 1/16". Please be aware that some measuring tapes may have even smaller increments.
Features of a Measuring Tape: Sliding End Hook
The sliding end hook is designed for two different types of measurements. An outside measurement (where the hook of the tape hangs over an edge), requires the hook to slide out a bit to account for the thickness of the material. When making an inside measurement (where the hook will push up against a surface), the clip slides in, again, accounting for its thickness. The measuring tape self-adjusts to guarantee an accurate measurement (as far as the tape is concerned).
Sanitizing Acrylic and Polycarbonate Sheet [X]
Acrylic and Polycarbonate Sneeze Guards and like products require special care while cleaning and disinfecting. To maintain the optical clarity of sneeze guards and other acrylic or polycarbonate items, use an acrylic or polycarbonate safe cleaner like Novus Plastic Polish #1, Brillianize Plastic Cleaner, or a mild soap solution.
Please reference the following compatible cleaners when DISINFECTING acrylic and polycarbonate items. The use of commonly available commercial alcohol or ammonia-based disinfectants may cause crazing and damage.
All sales on twinwall are FINAL. No returns or refunds will be accepted once the material ships.
Twinwall polycarbonate from Interstate Plastics provides an endless range of glazing and roofing applications, for extreme weather conditions, and is known for its light-transmitting and reflective qualities. Twinwall is attractive, durable, easy to install, and has the impact resistance and UV protection to withstand anything you can throw at it. Twinwall's notorious double paneled sheets serve to trap air, therefore increasing the product's insulation strength. Insulation properties will increase depending on the material's thickness.
Twinwall's surface is protected from the degradation effects of UV radiation by a proprietary co-extrusion process. Beneficial infrared light passes through the material promoting an ideal growth environment. UV-resistant Twinwall is twelve times lighter versus glass and the resins comprising the material are specially developed for excellent flame retardant properties.
Note: We recommend only using Interstate Plastics' Aluminum Vent Tape with twinwall and multi-wall polycarbonate. 6mm (.236") and 8mm (.315") wall should be used with 1"x108' tape. 10mm (.394") and 16mm (.630) wall should be used with 1.5"x108' tape.
Fold back the printed sheet protection film 10 cm. on each side.
Attach ventilating edge tape to the lower edge and sealed edge tape to the upper edge.
Preparing the End Profiles
Use a metal saw to cut the aluminum edge profiles into pieces matching the width of sheets to which they will be attached.
Drill drainage channels to allow for the flow of condensed water along the profiles used for the bottom section of the building's roof.
Attach the edge profile to the sheet within the short side on the top of the sheet.
Preparing the HPC Connecting Profiles
Cut the base profile and the cap to the length required. For curved roof buildings, cut the connecting profile cap 2 cm longer than the base.
To anchor to non-metal structures, drill 7 mm holes 50 cm apart in the base for the beam structure or according to the position of the purlins.
Installation Instructions for Roofing a Beamed Structure
Step 1: Use screws to attach the base connecting profiles to the roof beams. Make sure that screws do not bend, tear or exert excessive pressure on the profile.
Step 2: Place the sheet on the top of the base profile support edges, with the side covered by the printed protective film facing upwards.
Step 3: Slide the base under the sheet and attach it to the beam.
Step 4: Place the side spacer profile onto the roof beam and attach the cap to the base by hammering into place with a rubber mallet.
Steps 5 to 7: Continue adding sequentially, a sheet (step 5), a base connecting profile (step 6) and a cap (step 7) until reaching the end of the building. After completing installation, remove all the printed protective film from the sheets.
How to Clean Polycarbonate Sheet
General Cleaning 1. Rinse surface with warm water to loosen preexisting dust, dirt and grime. 2. Gently wash surface with a mild soap and a soft microfiber cloth or sponge. 3. Rinse thoroughly with lukewarm water. Dry completely with a soft, dry cloth.
Removing Oil and Tar 1. Rinse with warm water to loosen preexisting dust, dirt and grime. 2. Gently rub the surface with a 50/50 isopropyl alcohol and water mixture using a soft, non-abrasive cloth. 3. Immediately rinse material with water and dry using a soft, dry cloth.
Removing Heavy Markings (e.g. graffiti, paint, marker, inks, glazing components) 1. Rinse with warm water to loosen preexisting dust, dirt and grime. 2. Gently rub the surface with Naphtha VM&P grade, isopropyl Alcohol, or butyl cellosolve, using a soft, non-abrasive cloth.
Removing Adhesive-Backed Labels 1. Stubborn adhesives can be removed using isopropyl alcohol, Naphtha VM&P grade or kerosene.
Removing Scratches 1. Deep scratches and gouges made by sharp objects such as keys, screwdrivers and knives cannot be repaired. 2. Fine scratches can be cosmetically hidden by using our Novus 2, followed by a polishing agent such as Novus 1.
Special Note: Always rinse edges of polycarbonate with generous amounts of warm water, as the edges of polycarbonate sheet are not protected with an abrasion and chemical resistance hard coating.
Planning and Creativity
Planning In good architectural planning elements of the environment in which the structure will be placed must be taken into account. In outstanding architectural planning, the environment becomes an integral part of the structure.
Creativity Twinwall Polycarbonate sheeting harnesses nature to create the interior atmosphere by enlisting nature's qualities for the creative process. Realizing that the creative process in building depends on the ability to adapt the materials for the design concept, Polycarbonate Twinwall offers architects a raw material that can bring many architectural and design projects to fruition.
Polycarbonate Wind Load Charts
These charts show wind loads and sheet deflection that should be taken into account when designing a covering. Use of the graph indicators is quick and easy, and is intended to provide information of a type generally acceptable in civil engineering. Each chart provides data for 3 different sheet widths with the maximum proportional deflection being 1:20 or 5% of the specific width.
The right-hand area, where the curves become more horizontal, measures specifically and only sheets clamped at 2 sides. The left-hand area measures specifically sheets glazed in frames with supports perpendicular to the sheet ribs. For structures built in areas with variance in meteorological conditions, the use of adequate safety factors is recommended in order to reduce risks.
The data and information in this section is given in good faith but only as basic technical support for engineers of various structures. In no way can this information be substituted for the responsibility and liability of the designing engineer of a structure as determined by law. The information pertains to the roofing material only and does not in any way determine the strengths required in a supporting structure or in various glazing systems.
Bending is done by cold forming along the direction of the flutes. Bending guides are available.
Bonding ("gluing") can be done with Weld-On 55 adhesive.
Material Warnings
WARNING: This product can expose you to chemicals including Bisphenol A, CAS 80-05-7 , which are known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Warning: This product may have sharp edges and points. Contact may result in injury. Handle with care.
Disclaimer: Interstate Plastics makes no representations about any of its products that are modified in any way after they leave its possession, nor do its representations apply when any of its products are improperly used or stored.
Each customer of Interstate Plastics bears full responsibility for making its own determination as to the suitability of each material, product, recommendation or advice provided by Interstate Plastics. Each customer of Interstate Plastics must identify and perform all tests and analyses necessary to assure that its finished parts incorporating materials from Interstate Plastics will be safe and suitable for use under end-use conditions.
Major in construction and agricultural industries as well as many DIY applications. Polycarbonate has an impact strength 200 times greater than glass and 8 times greater than Acrylic. A solar grade co-extruded layer protects the sheets against yellowing and surface wear from extended UV exposure.
Endless applications for architectural design, roofing, windows, and installations
Hurricane and storm window/roofing protection
Greenhouse roofing
Light dispersion and transmission applications
Insulation applications
Date
Review
2021-06-11
I called and got a rather cold reception from other end. Then I was told there is a 16 week wait time for materials or it can be subcontracted. I found another Greenhouse Supply company that didn't charge $300 delivery. In fact it was free. Ordered Thursday and being delivered Sunday. Yes Sunday.
2021-02-15
Good customer service - agents willing to listen. After delivery delay, company representatives worked out a resolution that helped to remedy matters for me. Thank you.
2021-02-12
BE AWARE THERE MAY BE SHIPPING ISSUES - First review was deleted, so I'll just quote from my email to the company rep -
I am not sure of all of the details of your summary, but I have worked out a solution with ____(independent shipping company rep) here in __ to have the materials shipped to an alternative address where I will have crew to take the crate off the truck.
I have returned every communication that was made to me, but it has taken me a few steps to do this additional coordination here in __.
I may have missed the fine print of the disclaimer on our website, but I know I selected and paid additional cost for a residential delivery, and I do not know of many residences with loading docks.
____ and I worked out a solution last week, but we have been experiencing inclement weather here this week. We?ve had an ice storm and an emergency declaration due to it, and I haven?t been in a position to ensure that the crew I have hired would be available to receive
2020-06-02
need to make to make 30" for greenhouse proble 5" sections w/ a40" --42" front panel to open with a hinge you got some ideas
2020-02-25
I am trying to find good quality PATTERN PLASTIC for my job. I am a seamstress. I have been trying to find Pattern Plastic that I will be able to use over and over I have copied my pattern out. Any ideas?
2019-09-06
Just wanted to give some props to Robert. I have been trying to find sheets of poly-carbonate and channel for several days. Upon calling interstate plastics Robert was very informative and eager to land the sale. He took accurate notations of the products I needed and in a very short amount of time had emailed me a complete bid with shipping and packaging included. He also let me know of a sale on a higher grade product and provided me with a nice little discount. In my book the service was first rate and feel Robert went above and beyond to help a guy out on a late Friday afternoon.
Thanks,
Dow G.
2019-02-21
I am trying to replace one twin wall panel in my 15-year-old greenhouse. I need 48"long and over 27+ inches wide. The last panel I tried to purchase was 37 inches wide, which is fine because I can make the cuts. I could buy even wider panels to have extra. I thought it was 6mm, but that is too thick and most of the kits like it are 4mm. Do you carry this thickness in twinwall?
2017-09-06
Quick service.
2017-08-29
Question.....
I'm wanting to build a solar kiln, for drying wood. I plan on basically building a greenhouse with black plastic over wood, and fans circulating air, and dehumidifier. It will be getting pretty warm, but probably not over 140-150 degrees........The question is, can this product handle that much heat?
2016-03-17
Interstate Plastics has a very helpful staff, thank you to your entire team. They helped us work on a large greenhouse project for our farms and are very happy with the results.
2015-11-10
What a headache it was to figure out all the sizes and caps and screws I needed for a fairly large greenhouse project. Thankfully Interstate Plastics did everything they could to make this as easy as possible. Much thanks to your crew!
2015-10-12
Beautiful, well made product. Professional service too
2015-08-31
Great product with lots of support from the team at interstate plastics. They have all the extra bits and pieces needed for roofing and glazing. Top notch service.
2015-03-17
Great instructional PDF and reference video. Thanks for all your help in making our concept work!
2015-02-16
sourcing 3,000,0000 pcs of 7" x 10" twin wall polycarbonate per year or something similar - must be flexible in all directions and very strong. Price/pc needs to be $.04/pc. Is this feasible?
2014-11-05
Great material, great support. Had a little trouble tracking down end caps. It turned out they do indeed sell them but it was not on the website so be sure to call in.
2014-10-29
I was given very helpful information throughout the painstaking process of new roofing for our deck. Interstate Plastics made it easy and simple! (At least from the ordering aspect!) Fast responses especially over the phone. I was never put on hold for more than 30 seconds!
2014-06-05
Although some sizes are unavailable online, I appreciate the helpful service Interstate Plastics provided me and my wife over the phone about hurricane protection.
2014-05-13
Superb superb. Great shipping time for being on the east coast. Quality material at a fair price.
2014-05-09
Strong flutes, indestructible. Great material with helpful service to boot.
2014-04-15
This looks very cool on our carport. Ordering and having it shipped were super simple!
2014-04-14
Great product at a great price. It's very flexible yet strong, and it looks fabulous as an awning!
2014-02-27
Long sheet sizes with excellent protective shipping. No damage over multiple orders. Overall a pleasant experience ordering.
2014-02-18
Beautiful material and great service.
2013-11-01
Customer service was very helpful in placing my order. The twinwall arrived in flawless condition. Very happy with our overall experience.
2013-10-15
Word to the wise - twinwall is not for window replacement! I ordered the wrong stuff so what can I say, but the shipping cost and times were very reasonable.
2013-03-11
We were pleased to find that this holds well for roofing on an outdoor playhouse. Our children have managed to stay dry and it wasn't very expensive.
2012-10-16
We used a twinwall material several years ago, for a special purpose. We were not able to find this recently, but found it on this website, with pictures, so ordered it. What we received was not what was pictured: the product sent had 3 walls. Other companies listed this product as multiwall. The salesman said this was not refundable, as it was custom cut. Misleading on-line catalog.
2012-10-08
Got my material, thanks for the quick service.
2012-10-02
I ordered this for my greenhouse project and it has worked perfectly! Insulates well and easy to install. Material arrived within a week and was in great condition. Once I got it I needed to cut it and was able to call for advice on the best way to cut it which was extremely helpful.
4 stars based on 30 Review(s)
WARNING: This product can expose you to chemicals including Bisphenol A, CAS 80-05-7 , which are known to the State of California to cause birth defects or other reproductive harm. For more information go to 
