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Carnation Walling - Finishing Forming

Star Implement groove keyway and holes for pipes etc and add extra bracing.




Make external horizontal bracing

These 2x4 planks go on the outside of the wall.  They hold the external vertical 2x4 batons the right distance apart and with padding bits between them and the EPS they help withstand the wet concrete pressure.  Here are the dimensions for the overlap and underlap cases for a convex house wall corner...

<Update drawings to be 2x4>

Ifc Horiz Brace External Convex Bottom Overlap

Ifc Horiz Brace External Convex Bottom Underlap 

And here are the versions for a concave house wall corner...

Ifc Horiz Brace External Concave Bottom Overlap

Ifc Horiz Brace External Concave Bottom Underlap 

The planks also have 3/16" holes on 4" center between the 3/8" holes in order to screw into the padding spacers to stop the padding spacers from dropping out.

<Update drawings to be 2x4>

Ifc Horiz Brace External Convex Overlap

Ifc Horiz Brace External Convex Underlap

The padding spacers used between the horizontal bracing and the EPS are 8-3/8" long to fit into the 8-1/2" gaps between vertical 2x4 batons...

Padding spacer 2x6 

Add external horizontal bracing

Now that you have fitted all the EPS sheets it is ok to add the 2x4 external horizontal bracing.  There is external horizontal bracing at the bottom of the wall and also 4' up the wall.  Fit padding spacers between the horizontal bracing and the EPS, using wood screws to hold them in place.

Squirt foam gap filler in the gap between the horizontal bracing at the bottom of the wall and the foundation polyethylene covered EPS.


Fill gap under 2" EPS with foam

There is no concrete slab under most of the 2" EPS because the slab does not extend out that far.  There's just the EPS that lines the foundation with 6 mil polyethylene sheet over it.  There is nothing much that can support the external vertical 2x4 batons so they rely on being held by the steel threaded rod through the wall.  Use pieces of 2" EPS and foam gap filler to fill under the 2" EPS sheet to the foundation EPS.  It will expand out of the gap but can be broken away later.  It is ok to put foam under the external vertical 2x4 batons as it will easily break away when eventually the batons are removed.  (Never cut away excess foam on the outside because you may damage the 6mil polyethylene sheet.)


Implement groove plank, wood cubes, and walkways





Implementing and bracing pipes through walls



Sewage Pipe Through Wall Y


HRV Vent pipes

Vent Hole Drill Tape Measure 

Vent Hole Drill Locating On Eps 

Vent Hole Drill Location 


Where there are holes to allow electrical, plumbing, utilities, and vents through the concrete wall, it is best to use 4" PVC pipe cut to a length of XX".  This is the right length for the wall width plus two pieces of 2-by either side to brace it.  Where it is the actual 4" PVC pipe that will be used (eg air ducting), make the pipe longer so it can be joined to other piping.

Hole bracing inside 

Hole bracing external 

Full set of ICF holes 

(The pictures show bits of 2x4 to sometimes attach to the vertical bracing, but it is better to just always use Kreg screws to the batons.)

Things not to forget

Through walls

Electrical main feed through back wall

Well water main feed through back wall

Internet through back wall

Propane through south wall

Pressurized rain water through west wall

Power for external wall power outlets

Power for external lights (plan them in AutoCAD)

Motion activated yard zone wires

Water pex to external hose faucets

HRV inlet and outlet 6" vents (two sets as two HRVs)

Combustion air intake and outlet for wood fires

Tumble dryer vents

Bathroom extractor vents

Kitchen extractor vent

Vent from server room

Hot and cold water for external shower

Water pipes through internal walls

Fire sprinkler pipes through internal walls

Muddy water sink pipe to yard

Wall alcoves in internal walls (eg up the stairs)

Bolts for any wall mounted toilets

Central vac though internal walls

Earth wire through west wall

Wires to generator hookup plug

Cat-6 from DSL modem (elsewhere on property)

TV feed

Spare holes

Through ceiling

DWV stack pipes

Toilet holes for floor above

Floor drains for floor above

Shower u bend holes for floor above

Bath u bend holes for floor above

HRV stale and fresh 4" PVC pipes

DWV vent pipes

Hooks for kitchen island roof

Hooks for chandeliers (and swings etc)

Sink pipe from kitchen island sink

Electrical up to floor above

2" water pipe for sprinklers to floor above

Vent from safe room

Trash pipes (eg from kitchen to basement)

Compost pipe (from kitchen to basement)

Fire ash shoot (from living room to basement)

Central vac

Holes under pilasters for floor above


TV feed?

Spare holes



Inspection holes

Inspection hole under window 

Inspection hole under door 

Inspection hole plug 


Additional bracing 

Wherever you think there might be a weak area in the wall it is good to add some extra bracing.  Typically this means some horizontal pieces of 2x4 that are screwed between the vertical bracing assemblies.

Sometimes a long horizontal plank is useful to keep two windows in line.  It also forms a useful shelf for tools and lights.

Bracing shelf across windows

Bracing inside before concrete pour


Install bolts for railings

See here .


Move 6mil polyethylene edges

The large polyethylene sheet that hugs the contours of the EPS flooring blocks currently extends to over the 8" of wall EPS.  The vertical rebar in the walls will be through puncture holes in the sheet.  Just ahead of the concrete pour you need to cut and move the edge to go down the inside of the wall plywood.


During Concrete Pour

The actual concrete pour is handled in the next step, but it is worth noting that immediately after the pour, while the concrete is still wet, it is necessary to check the walls are still accurately vertical and if necessary adjust them using turnbuckles on the angled bracing.


After Concrete Pour

Remove the wall ties

Undo the nuts and pull out the threaded rod.


Remove thick plywood

The construction grade thicker plywood is easy to remove because the thin plywood stops the concrete from touching its surface.  

Squirt PL-Premium into holes in thin ply

As well as filling the holes so they can be sanded and painted, the PL-Premium also secures the plastic pipe to the thin plywood so the plywood is less likely to fall off the concrete wall.


Fill EPS holes from outside

Do this all the way through with foam gap filler .