Constructing your walls
When a ICF form is cut, it can be identified using tabs and webs. If using LOGIX ICF you should always try to keep at least one side of your form a factory end with the offset interlock. If using NUDURA, the block is reversible and the only requirement is to cut at 4” past a web to be able to reuse it.
ICF Quick tip: A cut form with a factory end, two webs, and two tabs can be referred to as a “2+2”. This keeps measurements consistent and creates clear communication with your team.
By establishing a systematic form pattern that takes the building dimensions into account, maximum efficiency will be achieved.
Always install ICF blocks with interlock knobs facing up.
The First Row
Begin at a corner. Set corner block so the outside panel of the block is on the chalk line.
Go to adjacent corner and place an opposing corner there. When using a nonreversible ICF form, alternate between left hand (LH) and right hand (RH) corners from one to the next. (ex. Row 1 has 6 90 deg corners. Use 3 left and 3 rights) For reversible blocks such as NUDURA ICF, this is recommended as well, however, the blocks are reversible so no specific attention is required to grabbing the correct block.
Work towards the center of the wall placing standard (straight) ICF forms in place in an end-to-end fashion, zip-tying or using horizontal hooks to secure them together appropriately.
A cut will need to be made when the ICF forms are within 4’ (LOGIX) or 8’ (NUDURA) of one another. Ensure both corners and the standard forms are set properly on the chalk lines.
Cut a standard form to fit the space remaining between the ICF forms. The cut may not line up with a line. This is ok and is referred to a stack seam. Leave this seam to run vertical each row to the top of the wall. - Reinforce this joint with a piece of plywood or lumber and screw into the ties on each side of the joint. This will reinforce the joint to make sure it does not blow out when pouring concrete. - Make sure this is done on both sides of the wall.
Continue around the wall in this manner until the first row is complete and dimensions are verified.
Place necessary rebar in first row as specified and according to local code and as per the manufacture engineering requirements.
(Don’t have this? Please contact ICForming and we will be happy to email it to you). We recommend placing rebar in the groove furthest inside, to avoid hitting the footing dowels which should be close to the center of the blocks.
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