I'm looking for an icf block which has more insulation on the outside of the form rather than equal amounts on both sides. I've seen that Quad Lock can do that but do any other manufacturers provide an assembled block that does this?

Most suppliers do this by having you buy a bigger block (one that can hold say 8 inches of concrete instead of 6)

Then you buy foam inserts you slide in to take up the extra 2 inches where the concrete goes.

Nudura has a Plus Series form (extra insulation laminated to the forms at plant) or inserts as described above. Many other manufacturers have the inserts for increased insulation (BuildBlock, Logix, Fox). I know Amvic has a thicker block available, but IIRC it does not have an option with off-set insulation.

I've seen those but seems like an unnecessary extra step.

Any idea what those slip ins cost?

Inserts are available in multiple thicknesses. There would also be a premium for the larger form needed to make room for the insert (ie, if a 6" concrete thickness is needed and you want to add 4" of extra EPS, you would need to use a 10" core thickness - expect to pay more for a 10" form).

Too many variables for me to provide rough pricing. Best bet is to contact your local supplier and have them provide pricing.....sorry I can't help you more.

Polycrete R-Stak™ adds R value. These 2’ X 8’ EPS panels in 2.5” or 4” thickness slip inside the Big Block ICF and boost the insulation value to R31 and R37. No gimmicks, no “Effective R Value” salesman spiel. It’s just more insulation. It’s simple to install, and our proprietary expander clip holds it solid without glue or screws.

Want more insulation? Customization's no problem.You can have as much insulation as you want up to 23" for 6" of concrete and it's just as easy to install. https://www.facebook.com/PolycreteUSA/videos/10152295685945590/

Each 16 sqft Polycrete ICF costs an additional $1 / 2" increase in core thickness, so for the 4" insert, the extra cost of the ICF is 12.5 cents/ sqft and the 4" insert itself costs about $1.80/ sqft.

Thanks Bruce.