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5. SPECIAL INSTALLATION PROCEDURES <br /> SPECIAL INSTALLATION PROCEDURES No. 12 <br /> SEVERE WEATHER/SNOW AREASNALLEY DETAILS <br /> \\ \ \ 18"wide,double <br /> splash diverters. <br /> + FILLER STRIP(1"x2") <br /> Underlayment / Ice <br /> and water shield is <br /> applied under the <br /> valley and up and <br /> over the valley side <br /> walls. <br /> ° CHIMNEYS AND/OR ROOF-TO-WALL <br /> \ Fascia metal shall be Where the roof file meets a chimney or <br /> trimmed to fit around wall, install counter flashing to insure full <br /> valley exit point to weather protection. (See Illustration.) <br /> allow water to flow <br /> a freely over the entire SHAKE AND MISSION TRIM <br /> 18•MIN. width of the valley. For severe weather conditions, it may be <br /> jnecessary to use a pliable type flashing <br /> material to provide a weathertight seal at <br /> FLOW LIN <br /> Y OW LINE ER AT THE %'MINIMUM trim intersections.CLOSED GERARD VALLEY/SOLID PAST FASCIA \ <br /> SHEATHING ICE/SNOW MEMBRANE <br /> Gerard recommends an Ice-dam <br /> protection membrane be installed where <br /> the average temperature is 25°F <br /> VALLEYS Store the panels used for cut sections (-4"C)or less. <br /> RE-ROOFING OR SOLID SHEATHED inside, or warm them prior to cutting and <br /> ROOF DECKS: bending. To prevent leakage from the freeze/thaw <br /> An adhesive "self stick', "Ice/Snow" type ice and snow build-up along the fascia <br /> of underlayment beneath valley metal is SNOW GUARDS(SNOWFALL AREAS) perimeter. Membranes for this purpose are <br /> recommended. It should extend a PURPOSE: generally manufactured from rubberized- <br /> minimum of 9"(230mm) past the edge of To prevent large sections of snow and ice type material in rolls 3 feet wide(900 mm) <br /> the new valley metal. Valley metal width from sliding off the roof. Commercially it is recommended they be installed up all <br /> shall be a minimum of 18' (450 mm)wide available, steel-type snow guards can be valleys. <br /> with two 11h" (38 mm) splash diverters. secured to the Gerard panels out of the <br /> Valley end laps should be sealed and be a main water channel with sheet metal a When installing Gerard in severe wind <br /> minimum of 6' (150mm). Make valley screws and then sealed. Follow the snow or snowfall areas,special fasteners may <br /> panel(cuts)as long as possible to eliminate guard manufacturer's installation be required. <br /> laps close to the valley pan. This valley specifications for the correct spacing. <br /> metal can be used for new construction. A Generally, these special details will <br /> SEVERE RAIN AND SNOWFALL AREAS apply for Gerard Shake panels as well as <br /> WOOD/STEEL OPEN RAFTER/TRUSS In heavy rain or snowfall areas, it is Gerard nom. ff in doubt contact the <br /> FRAMING: important to take special care when Gerard Technical Services division. <br /> In addition to the above requirements, installing Gerard. The following <br /> when open framing is used a reinforced preventative measures may be required: <br /> self supporting underlayment shall be <br /> applied around the fascia perimeter and <br /> down the valley to prevent sagging of the <br /> ice/snow water barrier material. (See <br /> Important Note on page 1) <br /> Open valleys are recommended in freeze- SEALANT r SLOT CUT INTO <br /> thaw conditions to prevent ice damming. 2 x 2 BATTEN (50 x 50mm) COUNTER FLASHING i WALUCHIMNEY <br /> EXTREME COLD CONDITIONS TILE <br /> Gerard panels have been installed in <br /> various cold climates the world over with <br /> no detrimental affects to the surface <br /> coating. During installation extreme care is <br /> needed when nailing the panels on the 1 x 4 COUNTERSATTEN <br /> roof. Hand-nail the last 1/4' (6mm) of the EXISTING ROOF (25 x 100mm) <br /> nail or use a nail punch to seat the nails. <br /> 0 Gerard Roofing Technologies,2001-03-01 Page 67 MWERABIr <br />