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INSTALLATION GENERAL INFORMATION <br />ADD THE BACKnU. <br />Backfill behind the base course and each successive ALLAN BLOCK course with well draining <br />granular fill (sand, gravel, pea rock, mixed soil). Clay and organic topsoil are not recommended. <br />Also fill the voids and pockets In and between ALLAN BLOCKS with granular fill and carefully <br />tamp down. <br />INSTALL ADDITIONAL COURSES <br />Position the second and additional layers of ALLAN BLOCK over the base course by staggering <br />the edges to be in the middle of the block beneath it. The setback angle is automaticaliy <br />established by placing the block tightly against the front lip of the blocks beneath it. Backfill in the <br />same manner as you complete each course. <br />CURVED AND SERPENTINE WALLS <br />ALLAN BLOCK walls are adaptable to complex designs and site conditions. Serpentine and <br />curved walls are built with ALLAN BLOCK'S special angle block. Inside curves are built simply <br />by placing the front faces edge to edge and fanning blocks to meet the curve. For larger outside <br />curves merely alternate regular blocks with angle blocks to form any line. For tighter outside <br />curves (r<3ft) all angle blocks will be needed. After your base course is laid, simply stagger the <br />blocks inthe successive rows above to continue the curved wall and to provide the interlocking <br />strength that the ALLAN BLOCK system is designed to provide. <br />CORNER BLOCKS <br />ALLAN BLOCK'S special comer blocks have a dual purpose. If the erxf of any wall is "stepped <br />down".the right or left hand corners provide a finished end for each layer. For walls requiring 90" <br />comers.the comer block can be alternated or linger grooved* to provide a perfect comer. <br />FOR TALLER, REINFORCED WALLS <br />ALLAN BLOCK'S unique design allows for a variety of installation techniques to achieve strength <br />in taller walls. Earth anchors. GEOGRID fabrics, rebar and poured concrete can be integrated to <br />provide strength for large scale projects. Consult your ALLAN BLOCK distributor for <br />pre^ngineered plans. <br />011/88 <br />h'J • • A ^ II