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Installation over Concrete
Resilient Floor Tile

Builder 3&2 Volume 02 - Construction manual for building structures
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Figure 6-6.—Wind block (parquet) laminated flooring. anchored to the existing slab. Shims can be used, when necessary, to provide a level base. Strips should be spaced no more than 16 inches on center (OC). A good waterproof  or  water-vapor  resistant  coating  on  the concrete before the treated strips are installed is usually recommended  to  aid  in  further  reducing  moisture movement. A vapor barrier, such as a 4-mil polyethylene or similar membrane, is then laid over the anchored 1- by 4-inch wood strips and a second set of 1 by 4s nailed to the first. Use 1 1/2-inch-long nails spaced 12 to 16 inches apart in a staggered pattern. The moisture content   of   these   second   members   should   be approximately the same as that of the strip flooring to be  applied.  Strip  flooring  can  then  be  installed  as previously  described. When other types of finish floor, such as a resilient tile, are used, plywood underpayment is placed over the 1 by 4s as a base. WOOD BLOCK FLOORING Wood block (parquet) flooring (fig. 6-6) is used to produce a variety of elaborate designs formed by small wood block units. A block unit consists of short lengths of flooring, held together with glue, metal splines, or other  fasteners.  Square  and  rectangular  units  are produced. Generally, each block is laid with its grain at right angles to the surrounding units. Blocks, called laminated units, are produced by gluing together several layers of wood. Unit blocks are commonly produced in 3/4-inch thicknesses. Dimen- sions (length and width) are in multiples of the widths of  the  strips  from  which  they  are  made.  For  example, squares assembled from 2  1/4-inch strips are 6 3/4 by 6 3/4 inches, 9 by 9 inches, or 11 1/4 by 11 1/4 inches. Wood  block  flooring  is  usually  tongue  and  groove. UNDERLAYMENT Flooring materials, such as asphalt, vinyl, linoleum, and rubber, usually reveal rough or irregular surfaces in the  flooring  structure  upon  which  they  are  laid. Conventional   subflooring   does   not   provide   a satisfactory  surface.  An  underpayment  of  plywood  or hardboard is required. On concrete floors, a special mastic  material  is  sometimes  used  when  the  existing surface is not suitable as a base for the finish flooring. An underpayment also prevents the finish flooring materials  from  checking  or  cracking  when  slight movements  take  place  in  a  wood  subfloor.  When  used for carpeting and resilient materials, the underpayment is usually installed as soon as wall and ceiling surfaces are  complete. Hardboard  and  Particleboard Hardboard   and   particleboard   both   meet   the requirements  of  an  underpayment  board.  The  standard thickness  for  hardboard  is  1/4  inch.  Particleboard thicknesses range from 1/4 to 3/4 inch. This type of underpayment material will bridge small  cups,  gaps,  and  cracks.  Larger  irregularities should  be  repaired  before  the  underlayment  is  applied. High spots should be sanded down and low areas filled. Panels should be unwrapped and placed separately around the room for at least 24 hours before they are installed. This equalizes the moisture content of the panels before they are installed. INSTALLATION.—  To install hardboard or particle- board, start atone corner and fasten each panel securely before laying the next. Some manufacturers print a nailing pattern on the face of the panel. Allow at least a 1/8- to 3/8-inch space next to a wall or any other vertical surface  for  panel  expansion. Stagger the joints of the underpayment panel. The direction of the continuous joints should be at right 6-4







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