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TWINWALL is a high quality transparent glazing material. TWINWALL sheets are manufactured from high performance engineering plastics using sophisticated technology. TWINWALL's manufacturers are very particular in selecting only the finest quality raw materials for their product. The chosen resins are processed using co-extrusion technology. This forms a barrier against UV radiation and ensures that PSP's Polycarbonate sheets are very resistant to the elements and ageing.


When compared with glass, TWINWALL has several cost saving features. It is lightweight and, therefore, does not require expensive structural support. Furthermore, it has thermal insulation qualities.
TWINWALL is an ideal material both for professional and 'do-it-yourself' builders. The versatility of this high strength, weather resistant glazing product makes it suitable for many applications.TWINWALL meets the demanding requirements of modern design construction for both simple and complex applications such as:
* glazing for industrial, social and sports buildings
* conservatories
* covered walkways
* curved rooflights
* green houses
* cladding applications
* swimming pools
* patio covers
* gazebos

Fire performance
Multiwall polycarbonate sheets are classed as self-extinguishing. TWINWALL sheets have an exceptional fire performance and importantly do not give off toxic gases. Twinwall has been tested in many countries. In the UK it obtained the requirements of BS476 Part 7 and Part 6, Class 1 surface spread of flame.

Impact Resistance
Although light in weight, TWINWALL is approximately 200 times stronger than glass and virtually shatterproof. This ensures that it has the highest impact resistance of all the thermoplastic products.
A TWINWALL sheet will retain 80% of its impact resistance after a period of 10 years. This excellent resistance to impact damage exists over a wide temperature range and minimises any damage that may occur in handling, transport and installation.

TWINWALL sheets can be cold bent and used in many curved applications e.g. arched walkways. TWINWALL must always be bent longitudinally, never across the width of the sheet.In applications of this nature it is important not to place excessive tension on the sheet. Therefore when TWINWALL is cold curved the minimum radius should not be less than 150 times the thickness of the sheet i.e. 9OOmm.

TWINWALL is supplied with a protective film on both sides of the sheet. The film carries labels that indicate which side of the sheet is co-extruded with UV protective film. This surface should face the sun when installed. The protective films must be kept on whilst installing and working with the sheets. They can be removed when the work is complete. This will help avoid any damage or scratches.


We recommend that sheets are stored in areas not exposed to the sun's rays. This can cause high temperatures to develop inside the sheet and make the protective film difficult to remove. Extreme heat could also cause distortion in the panels.

Sheets can be cut with a stanley knife, a fine tooth saw or a circular saw. Alternatively, a hand saw held at a shallow angle may be used. When cutting polycarbonate sheet it is important to hold the
sheet firmly to prevent stress and vibration.

Drilling and fixing
Sheets can be drilled using normal drills bits, however the sheet must be supported firmly underneath. It is important to allow for thermal expansion, so holes for fixing should be drilled 2mm larger than the screw shaft. Any dust or chippings must be removed from the inside of the sheet using compressed air. PSP TWINWALL fixings should be used to secure the sheets.

Taping and capping ends
The top and bottom ends of the sheet must always be sealed with a breathable aluminium adhesive tape. This tape is available from PSP Limited. The tape should then be protected using PSP's polycarbonate end cap. This procedure will prevent any insects, dust or dirt penetrating the inside of the flutes and will help reduce condensation.


Snap Lock GLazing Bar.
The Snap Lock system employs a two-section polycarbonate joining mechanism to greatly simplify the attachment of TWINWALL sheets. Under this system the bottom half of the two-piece joint is bolted down to a purlin. Twinwall sheets are placed on either side of the joining mechanism and the top half is clipped in place to secure the sheets firmly together. Leave a gap of 3mm between the edges of
the sheet and the glazing bar to allow for thermal expansion.


When installing TWINWALL sheets there are a number of things to consider:
* All sheets must be installed with the flutes running vertically
* Roofs should always have a minimum slope of 100 to allow water to run off
* All glazing systems, sealants, gaskets and other materials must be fully compatible with polycarbonate
* It is imperative that at least one rib of the sheet is engaged and clamped in the glazing system
* A frame of approximately 15mm is normally required when glazing. It is also important to add extra space for thermal expansion
* When drilling holes, thermal expansion must be taken into account (ensure holes are 2mm larger than shaft of screws)
* Sheets must not be fixed or clamped too tightly as this will prevent thermal expansion and contraction and will adversely affect the installation
* Twinwall sheets should normally be fixed to purlins or studs erected at a maximum of 600mm centres. In areas exposed to high wind, spacings should be reduced to 400mm centres.


Do not walk on TWINWALL sheets at any time. Always use a crawling board placed across several supports.

We recommend that TWINWALL polycarbonate sheets are cleaned twice a year. To clean the sheets we recommend using a solution of lukewarm water and an ordinary household detergent or mile soap. A soft Sponge or cloth should be used to remove any dirt and grime from the sheet. Do not scrub the sheet with brushes or sharp instruments and avoid any abrasives or cleaners of a highly alkaline composition.

PSP's TWINWALL sheets carry a ten year limited guarantee (see your glass or builders merchant for details).


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