FarmTec
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FarmTec Corrugated Polycarbonate Rooflight Installation Guide

Introduction FarmTec polycarbonate roof lights are a high-performance corrugated sheet offering superior light transmission. Suitable for use on agricultural buildings. These are classified non-fragile class C but should be treated as fragile at all times. Technical data UV resistant polycarbonate sheet Fragility rating Fire rating Colour Clear Light transmission

General information & safety measures • Roofs should always be designed with a minimum slope of 10° to allow adequate rainwater run-off. • Ensure that all sealants and tapes are compatible with polycarbonate. • All accessory products should be light coloured, preferably white. • Sheets which span up to two purlin spacings are of optimum length to cope with thermal movement • Maximum recommended sheet length for FarmTec polycarbonate rooflights is 3050mm. Note that sheet lengths have to be limited so that excessive thermal movement does not make end laps unweatherable or hole diameter...

Installation Storage Roof lights should be stored on a flat, horizontal and dry surface. Stack height should not exceed 1m. It is recommended that sheets are stored indoors where possible. If sheets are being stored outdoors, they must be covered with an opaque cover, tightly secured, to protect from wind, rain and sun. Transport and handling Rooflights should be transported horizontally on flat, sturdy pallets, equal to or longer than the longest sheet. Short sheets should be stacked on top of the longer ones. All panels should be secured and properly fastened to the pallet during...

Cutting When cutting the sheets, you must support the sheet to avoid stress and vibration. The blade should only protrude through the sheet by about 10 mm. If the blade is too far through the sheet, the blade ‘chips’ at the sheet producing a bad cut. Cutting multiple sheets can be achieved but extra care must be taken. Polycarbonate sheets can be cut with a variety of tools: • Fine tooth hand saw: hold the saw at a shallow angle and cut with slow steady strokes. • Jig saw fitted with a metal cutting blade • Band saw fitted with a high-speed metal cutting blade • Circular saw fitted with a...

Installation Filler blocks Sealant Polycarbonate sheets must be sealed using a 10mm diameter butyl strip sealant. Place a row of sealing strip either side of the purlin centre line, separated by about 10mm at the end laps and top of the polycarbonate sheets (so the fixing is in between the 2 strips of butyl). Side laps are single sealed, with the butyl strip positioned outside the line of side lap laplox fixings. (Ensure that butyl strip being used is compatible with polycarbonate.) Pre-drill oversize holes 200mm endlap Filler blocks Mitring The polycarbonate sheets do not require mitres,...

Installation Panel orientation When installing Eternit polycarbonate rooflights, you must ensure the clearly marked UV protected surface is on the outside, this is identified with a removal strip along one of the corrugations. Polycarbonate rooflights must always be installed with the corrugation running vertically, or up slope.

Chemical resistance & fire hazard FarmTec polycarbonate rooflights, in general, have excellent resistance to most chemicals; resistance to specific compounds depends on concentration and temperature, duration of exposure and stress within the sheet. Contact with plastisol coated metal sheets, wet wood preservatives, solvents and alkali cleaners should be avoided. However, FarmTec polycarbonate rooflights have good resistance to acids, aliphatic hydrocarbons and alcohols; common environmental pollutants and marine environments do not have a detrimental effect. An important feature of FarmTec...

Chemical resistance Good Little or no reduction in physical properties. Note: Values are only indications and should not be interpreted as absolute proof of resistance of any part against a certain substance. Testing under actual exposure conditions will provide a better indication of performance. Some reduction in physical properties after long exposure. Poor Significant change in physical properties after short exposure. Good Poor Poor Poor Good Fair Formic (HCOOH) Good Fair Poor Poor Poor Poor Good Fair Poor Good Fair/Poor Poor Good Poor Poor Thermal Movement Good Good Fair Good Good...

Iso-octyl alcohol Phenyl-ethyl alcohol Propargyl alcohol Good Poor Good Poor Thermal Movement 2-amino-ethanol (H2NC2H4OH) Methanol (CH3OH) Butylene glycol Fair (crazing) Poor Fair (crazing) Poor Sodium hydroxide (NaOH) Fair (crazing) Poor

Poor Good Good Poor n.d. Poor n.d. Good n.d. Good Good Good Good Good Fair Good Good Good Copper chloride (CuCl2) sulphate (CuSO4) Good Good Iron chloride (FeCl3) sulphate (FeSO4) Good Good Magnesium chloride (MgCl2) sulphate (MgSO4) Good Good Good Good Poor Good Good Good Good Good Good Good Good Good Good Good Good Good n.d. Good n.d. n.d. Good Good Salts Ammonium fluoride (NH4F) chloride (NH4Cl) sulphate ((NH4)2SO4) sulphite ((NH4)2SO3) nitrate (NH4NO3) Aluminium chloride (AlCl3) oxalate sulphate(Al2(SO4) 3) Barium chloride (BaCl2) bromide (BaBr2) Calcium chloride (CaCl2) nitrate...

Fruit & vegetable juice Beer, cognac, whisky, gin, vodka, wine, rum Milk, coffee, chocolate Mineral water Butter, margarine, sauces & vinegar Cooking oils All spices except: Nutmeg Clove oil Good Poor Poor Salt, sugar Ketchup, tomato puree Fish, meat Chemical resistance Food Stuffs Thermal Movement Mobil 10 W 40 Drill Oil Brake Fluid (ATE) Fair Fair Poor Poor Good Poor Fair Fair Good Good Good Good Good Diesel oil Terpene oil Gasoline Super Test Gasoline Refined oil Gasoline normal Soy bean oil, peanut oil, castor oil Spindle oil, dynamo oil, turbine oil, machine oil Refrigerator oil...

Fruit & vegetable juice Beer, cognac, whisky, gin, vodka, wine, rum Milk, coffee, chocolate Mineral water Butter, margarine, sauces & vinegar Cooking oils All spices except: Nutmeg Clove oil Good Poor Poor Salt, sugar Ketchup, tomato puree Fish, meat Thermal Movement