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20 Bucks are installed as a guide for stacking at openings as well as providing support for the lintel blocks above the openings. As was discussed earlier, the preferred method is to fasten windows and doors directly into the wall form material. The End Blocks and Half Blocks are designed to build openings as they have smooth ends to which windows can be fastened with screws. Alternatively 2x lumber frames can be built and fastened to the Wall forms to provide permanent bucks (typically pressure treated) for window and door fastening. If permanent wood bucks are used, an option is to make two frames with a gap to create a thermal break between frames. An alternative to using 2x lumber is to use 3/4"plywood. Temporary window and door bucks need to remain in place at least 12 days for curing of the concrete before removal. 4.7.2 Set the Corner Wallforms Using a laser level, or transit, set the Corner Wallforms in mortar at the exact outside dimensions of the building, at exact level. They must be placed in the proper orientation for the tongue and groove interlocking to work out around entire perimeter during lay-up (see section 3.8.1). After the fast course mortar has set, full lay-up may begin. The corners will be built up higher than the center courses. Then, string lines can be pulled which will enable rapid positioning of the course in between. The strings are easily secured to the corners by small screws in the wallforms. 4.7.3 First Course Walfform leveling Setting the first course properly is absolutely essential for the construction of a level,plumb, and square structure. Footings and slabs are never 100% level and true. After setting the corners at exact locations, build from the corners into the center of each wall run on a mortar bed. The last wallform in the course will need to be trimmed to fit. (Figure 3). Or,using plastic shims, shim the block to level the entire first course. When using the shim method, fill the cores of the first course of wallforms with a runny mortar mix. The mortar will fill the gaps between the footing and the wallforms. If choosing to lay a mortar bed for the first course as opposed to shimming the first course work 10'-15' sections of a wall at a time in order to avoid working with an excessively thy mortar mix. Check positioning of wallforms frequently to assure control of all three planes. . ShelterWorks General Application and Technical Information(GATI)version 2.5