3.15 REBAR PLACEMENT

Rebar Placement

Reinforcing steel needs to be installed as per specifications and plans. All reinforcing steel needs to meet local codes or site engineering.

Place required rebar into proper slot as per plan/engineering. Formed rebar holders are available on all Greenblock systems. Be sure to check for necessary code required overlaps. Normal overlapping is 40x the rebar diameter.

It is common for below grade rebar to be placed to the tension side of a wall and to the center of the wall above grade. Alternating rebar in the web slots can provide an area to drop vertical rebar thus orientating the vertical rebar in the center of the wall.

TIP: Mark the vertical footing dowels on slab, footing, or bottom course of Greenblock with paint, chalk, or felt tipped pen. This provides a guide to install your vertical rebar, ensuring proper alignment of the same.

Horizontal Rebar Placement

Horizontal rebar should be laid as required during placement of the block in each course. Make certain you lay it with the correct overlap lengths, normally 40 times the diameter. As each course with horizontal rebar is laid, remember to offset it to the previous course. Continue alternating the rebar this way for the entire structure. Rebar is usually placed in the webs rebar holders/slots.

Horizontal below and above grade requirements can be found by checking with local codes, ACI 318, engineering or PCA prescription method.

Lintel Steel Placement

Lintel steel needs to be positioned above doors and windows to support the load over these openings. Check local codes for overlap and concrete coverage requirements.

Lintel rebar depends on many factors and should be calculated by an engineer or taken from PCA’S Prescription Method; or to local codes.

Vertical Rebar Placement

REMINDER - Prior to laying the 1st block you might want to place a small PVC ring around each footing/slab wall dowel to provide a ‘catch’ for vertical rebar placement after the wall is erected.

If you use this method, after the walls are up, drop a vertical rebar from the top of the wall into each collar at the bottom of the wall. There should be a vertical rebar next to each dowel that comes out of the foundation. Thread the vertical bars between the horizontal bars, tying each vertical rebar to the top horizontal rebar or to a connector web. This will keep them securely in the center of the wall. Remember, vertical rebar needs to be cut to be approximately 3 inches below the pour height. If you are continuing on with another story of Greenblock ensure you use rebar long enough for the required overlap into the next wall section. Check local codes or engineering specifications for requirements.

Reminder: Greenblock recommends 2 horizontal runs of rebar in any top course or any horizontal courses that connect additional stories.

Reminder: If this is the final course of building with Greenblock, use a vertical rebar that will be under the top of the wall or sill plate, allowing for sill plate thickness if necessary.