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Fastening 'Fastener Position ~ Detail F + Detail G WC-3636 Acceptable fasteners include galvanized nails or plated self-drilling wood screws. Nails should be spiral or ring shank design with a neoprene gasketing under the head. The corrrect way to nail is to drive the fastener through the stee~so the nail washer is compressed securely against the metal. Refer to Detail "C". However, , DO NOT OVER.DRIVEthe nail and dimple the steel. If this is done, water may collect in the dimpled area and leak through. Under-driving can also allow leakage to occur around the nail shaft. Wood screws with combination metal and neoprene washers should be mechanically driven into the valley or the bottom fIat of the profile. Refer to Detail "D". When using nails, the nails should be two inches long to penetrate approximately 11,4 inches into the purlin when driven through the rib. Screw length should allow a penetration of one inch. When installing panels over insulation board, increase the above lengths by the amount of insulation thickness. Select nail lengths for roofing and siding that do not completely penetrate through purlins or girts. Never drive nails or screws through the drain chan. nel, as the result may cause leakage and ruin the effec.- tiveness of the drain channel. Detail "E" shows the proper fastening through the lap joint. Correct Under-Driven Detail C Detail D Nail Fasteners As illustrated in Detail "F" CENTURYDRAIN roofing should be attached through the top of each major rib into each purlin. If the roof purlins are spaced less than 18" on center, an alternate fastening pattern is through every major rib on every other purlin and nailing only !\~ center rib on alternating purlins. When using nails, attachment along the ridge and eave purlin on the roof should be through the bottom flat of the sheet instead of the top flat of the main rib. (Detail "G"l. ~ + . . D-96-SP-20M Over-Driven Detail E When using nail fasteners and attaching CENTURY- DRAIN wall panels to girts, either a pattern attaching every major rib over wall girts or in the bottom fIat sur- face next to each major rib may be used. (Detail "F" or "G"l. Screw Fasteners When using screw fasteners, it is recommended that screws be placed in the bottom flat surface immediately adjacent to the major rib on one side or the other for both roofing and siding panels. {Detail "G"I. + + + + - Printed in U.S.A.