Place form liners accurately to provide finished surface texture indicated. Provide solid backing and supports to maintain stability of liners during placing of concrete. Coat form liner with form-release agent.
Maintain molds to provide completed architectural precast concrete units of shapes, lines, and dimensions indicated, within fabrication tolerances specified.
Form joints are not permitted on faces exposed to view in the finished work.
Select one option from below; show details on Drawings or revise description to add dimensions. Sharp edges or corners of precast concrete units are vulnerable to chipping.
Edge and Corner Treatment: Uniformly [chamfered] [radiused].
2.15 THIN AND HALF BRICK FACINGS
Retain this Article if using thin or half brick facings on architectural precast concrete units.
Place form liner templates accurately to provide grid for brick facings. Provide solid backing and supports to maintain stability of liners while placing bricks and during placing of concrete.
Securely place brick units face down into form liner pockets and place precast concrete backing mix.
Clean faces and joints of brick facing.
2.16 STONE FACINGS
Retain this Article if stone facing is required. Refer to Division 4 Section “Dimensional Stone Cladding” for precast veneer.
Accurately position stone facings to comply with requirements. Install spring clips, anchors, supports, and other attachments indicated or necessary to secure stone in place. Set stone facings accurately, in locations indicated on Shop Drawings. Orient stone veining in direction indicated on Shop Drawings. Keep reinforcement a minimum of ¾ inch (19 mm) from the back surface of stone. Use continuous spacers to obtain uniform joints of widths indicated and with edges and faces aligned according to established relationships and indicated tolerances. Ensure no passage of precast matrix to stone surface.
See Division 7 Section “Joint Sealants” for furnishing and installing sealant backings and sealant into stone-to-stone joints and stone-to-concrete joints. Apply a continuous sealant bead along both sides and top of precast panels at the stone/precast interface using the bond breaker as a joint filler back-up. Do not seal panel bottom edge.
Retain one of two subparagraphs below if sealing dowel holes. Use sealant if a flexible filler is required; use epoxy if a rigid filler is required.