Advantages of MICF Lintel:
1/2" diameter pvc crossties take up less area leaving more space for concrete fill.
1/2" pvc crossties can act as rebar seats for multiple layers of rebar exactly positioned where you want them.
1/2" diameter pvc pipe can be cut to any length to create any width lintel required.
2x6 pressure treated header acts as temporary construction support until concrete lintel is poured and cured.
2x6 header can act as attachment point for door or window construction.
2x6 header can be replaced with up to a 24inch wide LVL for any width lintel, including multiple width CMU.
Header can be lined with roofing felt to protect wood against concrete contact.
Crossties are screwed directly to header thru pvc pipe to hold cmu shells in place until concrete lintel is poured.
Headers stop short of 8" bearing both ends so vertical end core reinforcing can extend thru lintel.
CMU shells with wood header bottom provides the best possible appearance as a continuation of block construction.
CMU shells with MICF crossties can be stacked multiple courses high to create any depth lintel you required.
Exterior shell can be lined with rigid insulation as part of an Insulated Masonry Concrete Form.
This Form system can be stacked on top of precast lintels to increase the depth of precast concrete lintels.
Why have a lintel that looks different than the rest of your wall? Your lintel can be a continuation of your
Poured in Place CMU Lintel W/ 2x Header Hidden in Bottom
Poured in Place CMU Lintel W/ 2x Header Exposed on Bottom
(2) L5x3 1/2 Lintel Hidden in CMU shells supported by Plastic Crossties
(2) L2 1/2x3 1/2 Composite Lintel Hidden in CMU shells w/ shear studs
Plastic Crosstie Lintel form Used to Extend Height of Concrete Lintel
A Better Masonry Block Lintel
Precast Concrete Lintels are strong but seeing concrete above each opening takes away from the appearance of running bond masonry walls.
Bond beam blocks and U shaped lintel blocks are one solution to retaining the running bond appearance over openings. But now there is a better solution.
You want to create a concrete lintel that is concealed within masonry shells to maintain your running bond pattern. Lintel blocks and bond beam blocks do this job but the masonry bottoms in lintel blocks or the remaining webs in bond beam blocks take away from the strength of your concealed concrete lintel by interfering with the concrete beam that you pour in place.
What if you could use a plastic 1/2” strong pvc pipe as the web members to hold together two masonry shells along with a wood bottom to create a concrete lintel form that has the minimal interference with your concrete pour while still being strong enough to hold the shells in place until your concrete lintel cures? The wood bottom can be hidden inside the masonry shells or the wood bottom can be exposed on the bottom to attach finishes or the wood bottom could be removed after the concrete lintel has cured.
The 1/2” pvc pipe would only interfere 7/8” into your 7 5/8” concrete lintel providing support for the masonry shells to resist the concrete lintel pour with the least subtraction from the concrete possible. At the same time 1/2” pvc pipe is inexpensive and can be cut to any length so you can create any width lintel you want.
The 1/2” pvc pipe can be screwed to the wood bottom with standard screws to hold the assembly in place and the wood bottom can rest on wood jambs to act as temporary shoring until your concrete lintel cures. Since the wood bottom does not extend past the wood jambs, the vertical bearing reinforcing bars can cross the horizontal lintel reinforcing for a concrete lintel integrated with the cmu posts on either side of the opening.
Dovetail channels spaced at 4 inch center in the masonry shells of your concealed concrete lintel would assure excellent bond between the shells and the hidden concrete lintel. The unused dovetail channels could be used for a secondary 1/2” pvc cross tie to act as a reinforcing bar seat that can be positioned up and down in your masonry form so you can locate your lintel reinforcing at any height that you want.
This is all possible with my patented dovetail crosstie connectors fashioned to attach masonry shells with dovetail channels formed in them with 1/2” pvc pipe crosstie web members. A better hidden poured in place concrete masonry lintel is now possible.
Links to More MICF Connector Ideas
Cast in Place Concrete Lintels
Round Corner in 12 Inches
Combine 2 Shells and Cube It
Dead Weight Soil Retaining
Replace Steel beam w/ Cast Concrete Beam
Masonry Structural Insulated Panels, M-SIPS
A Better Flexible Masonry Bond Beam
Let's Get Artistic with MICF
1/2" PVC Crossties: Let the Air Flow!
Poured in Place Prestressed Concrete Wall
ZigZag Running Bond Control Joints
Eyebrow Concrete Pilaster / Column!
Air Insulated Concrete Wall
Jump Ideascale Perfect House Wall
NCMA PHX Slideshow