The Greenblock Design

2-2thegreenblockdesign_page1_3Web-Ties on 6” Centers:

The most essential design feature when comparing ICFs; web ties on 6 inch centers create a much stronger block requiring less secondary operations than the majority of ICF blocks with ties on 8 inch centers or wider. 6″ centers also means there is less unsupported foam in a Greenblock wall which greatly reduces wavy walls, bulges and blowouts…And, more webs per block provides more attachment points for interior and exterior finishes. Greenblock ICFs allow for greater pour heights, utilize less labor and reduce valuable construction time.


2-2thegreenblockdesign_page1_4“Lego-Type” Interlocking Connection System:

Our unique friction-fit “nub system” creates a tight male/female connection course-to-course which helps eliminate “lifting” during concrete placement and minimizes the need for gluing, taping or zip-tieing joints. Water dams between nubs prevent water seepage which insures proper concrete cure and reduces the possibility of moisture infiltration.



All Greenblock ICFs are “Directional” (non-reversible)…by design…meaning that they will fit together course-to-course in only one direction. Our block was specifically designed this way to reduce or eliminate movement, lifting or “floating” of the wall during concrete placement (pour). The interior surfaces of our blocks have vertical “dovetail” channels running top to bottom. Each channel has a small “shelf” at the bottom which fills with concrete during the pour creating downward pressure so that the ICF block/wall doesn’t float or separate course-to-course.

Some ICF manufacturers offer reversible ICFs which are designed to be used up or down, left or right, and are typically vulnerable to lifting and separation since there is no integral design structure to hold them down during concrete placement. Reversible ICFs typically require gluing and/or zip ties to secure the blocks together horizontally, course-to-course. These types of secondary operations result in additional time, material and labor expenses.


Flat-Wall Design:


Greenblock’s flat-wall design produces an uninterrupted thickness of concrete, evenly distributed throughout the block, thus reducing voids and “honeycombing”, adding to the overall strength and rigidity of the wall.


2-2thegreenblockdesign_page2_312 Inch Blocks:


12″ high blocks provide optimum wall strength and rigidity because there is less unsupported foam when compared to the majority of ICF blocks on the market that are 16″ to 24″ tall. 12″ blocks also allow for 12″ horizontal rebar placement where design specifications call for maximum strength in hurricane, tornado or earthquake prone regions for example. 12 “ blocks stack faster , are easier to handle, require less cutting and produce less job site waste than larger ICFs. Plan take-offs are easier and less time consuming because the majority of walls, both residential and commercial, are in one foot increments.


Web Design:

Greenblock’s sub-surface, 100% recycled polypropylene furring strips are thicker and wider than most, providing greater block strength and stability. Clearly marked on the face of our block, the strips provide for easy, efficient attachment of interior and exterior finishes. The webs are also designed to hold rebar in place during concrete placement.

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