Written by Colin Showalter
Follow me on Twitter @Colin_PlastiFab
First of all what are bracing/scaffolding systems and what are they used for? These systems support the wall and allow people to work off the ground to reach higher up the walls. They also give you the ability to plumb the wall during and after the concrete pour. After you have installed the third course of blocks it is usually time to install the scaffolding and bracing system. If you are tall enough, you may be able to wait until after the fourth course or you can work from ladders. There are three common types used each will be described below.
The most common type of bracing/scaffolding system used by a one-time ICF builder is wood. Wood bracing usually consists of 2 2×4’s nailed together to form an “L” or strong back. This is attached to the ICF blocks every 5’-6’ screwing into the block vertically every 8”-24”. Screw the braces into the Advantage ICF ties using 3” screws.
Attach scaffold brackets and/or handrail brackets to the vertical braces. These brackets are usually placed roughly 30”-36” below the finish pour height of the wall or whatever height constitutes a comfortable working height to place and finish the concrete.
Turnbuckles are adjustable bracing devices that hold walls steady. Adjust the alignment of the walls before and after the concrete has been poured using turnbuckles. Install the turnbuckle part of the bracing system by attaching the diagonal brace, complete with turnbuckles, to the vertical braces with a short piece of 10M rebar. Before securing the bottom part of the unit to the ground, make sure the turnbuckle is adjusted to a central point. This will make it easier to make adjustments later on.
Metal bracing/scaffolding basically consists of all three of the components described above. The obvious differences are that they are made of metal instead of wood.
Because they are made of metal they are much more durable than wood type scaffolding. They are made specifically for pouring, bracing and adjusting ICF walls. The metal types are typically more adjustable than most other types. You can easily adjust the platform height, and wall plumb and straightness both before and after the concrete pour.
Tube Frame Scaffolding
Typically this type of scaffolding would be used on a commercial job with very high wall heights. It can be adapted to work with an ICF wall under construction. The wall is plumbed true, so it is critical the wall be attached to the scaffolding in a way that it will not move. This can be accomplished using a variety of methods, utilizing the ICF webs. There are also adaptor kits that allow this type of scaffolding to incorporate ICF metal scaffolding for commercial and high wall applications.
Additional information on bracing and scaffolding can be found in the Advantage ICF System Installation Manual pg 24-26. Also see installation video on our website at: http://www.advantageicf.com.
Note: ensure you follow your local OH&S codes when installing scaffolding platforms and hand rails.
Check back for the next Advantage Blog, The Insulated Concrete Form Brick ledge September 5, 2011.