The Tstud™ is a thermally broken, insulated wall stud assembly for use in exterior walls and in party walls.






Mold, ROt & Termite


With just ONE product, the Tstud™ raises the bar on 5 major construction concerns:
thermal breaksstructural strengthwind loadssound transmission and fire/life safety.

The Tstud™ is a new building product that uses two machine stress rated (MSR) or #2 lumber members, an internal truss system and a frothed-in-place closed-cell foam. These extremely straight, uniform studs make square construction a breeze. Conventional 2x6 lumber needs a 5-12% cull rate to avoid bowed, warped and cupped boards. Using Tstuds™ the cull rate is virtually zero.


It's quite easy to replace traditional 2x lumber with the Tstud™.
With little to no additional training.

Progressive Engineering, Inc of Goshen, Indiana, has tested a prototype of the Tstud™ vs a traditional 2x6 used in framing of an exterior wall. The tests were performed for a length of 10’-0” in straight down vertical compression to see how much a single stud could hold before failure vs a Tstud™ of a similar length. A #2 select 2x6 held 4,300 pounds on average while the Tstud™ held an astounding 12,655 pounds.

All dimensional lumber, that is used in exterior wall construction, fails testing on the “x” axis (the 1-1/2” direction) as it does not have the ability to stop the deflection from that direction as more weight is applied. Because the Tstud™ has been designed to stop deflection on the “x” axis or the “y” axis, the only way for the Tstud™ to fail is from straight down compression of fiber upon fiber. Thus maximizing the strengths of the Tstud™ as a structural wood member. Because of this design, all testing has been completed at 24” on center framing spacing - proving that all exterior walls can be constructed with superior structural capacity and at that spacing. Saving builders thousands of dollars in labor, lumber, nails, staples, and screws, from using 20% less framing members needed to construct a wall. A builder can also use the Tstud™ at the standard 16” or 19 diamond spacing.

Because of how the Tstud™ is constructed, it is also a mini header when used as a top plate. Only one Tstud™ is required when used as a top plate compared to two 2x6’s or 2x4’s in traditional framing which has been done for centuries. 

Because of the testing capacity of the Tstud™ in the plank direction, as in headers and top plates, less lumber is required to be used - again saving builders time and money!

The Tstud™ is potentially stronger than LSL (laminated strand lumber) or LVL (laminated veneer lumber) stud sized lumber in most applications up to 16’-0” in height. See the wind load tables in the Technical Evaluation Report (TER and compare to LSL and LVL studs without lateral bracing). The Tstud™ is able to be used in walls up to 16’ in height.


A built-in foam core gives the Tstud™ three times the insulation of a conventional wood stud.

In construction, the R-value is the measurement of a material's capacity to resist heat flow from one side to the other. In simple terms, R-values measure the effectiveness of insulation and a higher number represents more effective insulation.* The R Value through a typical 2x6 wood stud is 6.88. Any wood member causes there to be a transfer of heat and cold from the exterior of a home or a building to the inside of the same space; known as conduction. The only way to stop the transfer of heat or cold from one side of a wall to the other side is to purchase and install thick enough rigid insulation to the entireexterior perimeter of the structure.

The Tstud™ is the same depth as a 2x6 but offers an impressive stated R Value of 18 and has a 99.23% complete thermal break** through the stud. Meaning that there isn't a need for continuous rigid insulation to meet and exceed the 2015 Energy Code in all of the climate zones in North America.

Typically, the maximum R Value of any continuous insulation is only 5 and is ¾” to a maximum of 1” in depth.

The Tstud™ has approximately 2-1/2” of rigid insulation and we are using a stated R Value of 14.25.  Add in the R Value of wood at 1.25 per inch, times 3” of wood, and you get a combined wood and foam R Value of 18.

Why we say “stated” R Value: In preliminary testing, our foam tested out at an amazing 8.24 per inch, but this was an “unaged” R Value. Meaning that not all of the gases created in the process of turning liquid foam into a final rigid insulation product, had escaped the foam.  It was also at 1.9 pounds per square inch (psi) density. The density in the 8’ Tstuds™ is roughly 2.2 psi; which is less than what is used in the 16’ long Tstuds™. The standard  R Value of foam is 6 per inch and we have discounted that value down to 5.7 per inch. It's also impossible to know the depth of the actual foam or to know for sure how deep the wood members are. A 1-1/2” depth of wood can be anywhere from 1-3/8” to as much as 1-5/8”. So, in order to do our best to not overstate the R Value of the Tstud™, we have elected to do our best to understate than to overstate the facts.


Regarding the 99.23% complete thermal break through the Tstud™:

The proprietary truss system that holds the 2 wood members together accounts for .77% of a thermal transfer of heat and/or cold.

The truss is non-metal and is fully encased in foam. Continuous rigid insulation is attached with metal nails and still has up to .5% of conduction through the foam, depending on the diameter of the fastener.

By using the thermally broken Tstud™ Wall Assembly, a reduction of 4-7 points on the HERS numbering system is garnered thus yielding the building an approximate 18% improvement (depending on heating or cooling degree days and the climate zone energy code currently in force) in energy efficiency over standard 2”X 6” wall construction. The Tstud™ will be an excellent LEED (Leadership in Energy and Environmental Design) product.

This increase in the R factor is significant as there is not another solution that acts alone to offer as aggressive of an outcome. 

Therefore, with incentives to both builders and consumers being offered by way of rebates through government and utility providers, there is an opportunity to drive change to build with more energy efficient components to meet the new rigorous energy code legislations and net zero effect initiatives.

A test was performed by placing a commercial grade hot iron on one of the wood members. That wood member was heated up to 194 degrees in an effort to see how fast that temperature would conduct through the wood, through the foam, and increase the temp on the opposing wood member in order to replicate a wall comparable to one in San Antonio, Texas.  After 1.5 hours, the temperature of the opposing wood member raised by only 3 degrees, which we think happened by convection and not conduction. Proving, that the Tstud™, has a significant benefit in southern cooling zones and in northern heating zones.

 Thermal imaging of a shed constructed with Tstud™walls, floor and roof shows heat loss only through the door.

Thermal imaging of a shed constructed with Tstud™walls, floor and roof shows heat loss only through the door.


Hurricane and Seismic testing has been calculated and passed at 16” and 24” on center spacing. All builders we have spoken to, to date, have agreed that the benefits of the Tstud™ Wall Assembly have the ability to significantly improve the structural integrity of a structure, even at 24” on center framing. All of those builders have historically built at 16” on center are now considering making the switch over to using less studs to potentially save hundreds of dollars on building costs.

The amount of lumber required to build the average size house in America of 2,450 square feet at 24” on center framing is 58 less wall studs on average, which in turn, saves over 2000 fasteners that coincide with those 58 studs. In any case, continuing to frame at 16” on center is totally acceptable as well.

The Tstud™ Wall Assembly comprises all of the members needed to build an exterior or interior wall, including the top plates, bottom plates, sill plates under windows, all wall studs and cripples, and most headers used in construction today up to an 8’ wide opening (without snow load). The Tstud™ is constructed of two opposing wood members with a foam core, and the two wood members are held together with a proprietary truss, which gives the Tstud™ its strength.

See the Technical Evaluation Report(TER) which has been completed to make the Tstud™ Code Compliant, and able to be used in all wall assemblies in North America. Click here. 

 Lumber saved by switching to Tstud™

Lumber saved by switching to Tstud™

 Fasteners saved by switching to the Tstud™

Fasteners saved by switching to the Tstud™

Besides offering a “complete” thermal break through the wall assembly, the Tstud™ also offers an impressive ability to minimize the vibration of sound through a wall.

The Tstud™ has been tested by USG (United States Gypsum) in their state of the art sound proof testing facility. The Tstud™ Wall Assembly provided an STC (sound transmission class) rating of a +6, which is equivalent to a wall being constructed with RC (resilient channel) being applied to both sides of a wall.  This is a key benefit for structures being built next to noisy freeways, commercial locations, railroad tracks, etc. Equally important, the Tstud™ has many applications for use in interior party wall construction where STC ratings are important to minimize the transmission of sound from one room to the next. As in hotels, motels, apartments, senior housing, and in commercial or industrial applications. 

The Tstud™ foam core provides an impressive amount of sound proofing, equivalent to using resilient channel to both sides of a wall.

The foam is constructed using EPA-approved blowing agents. With life safety protection in mind, it is designed to char rather than melt and spread flames like other insulators in today’s market. Both of these properties make the Tstud™ the ideal choice for party walls that require a fire rating, as well as for interior walls around utility rooms, or exterior walls next to high traffic areas.

It can cost thousands to add resilient channel to both sides of wall to reduce sound vibration. The same sound transmission rating is free with a Tstud™ wall.


The foam core of the Tstud™ is currently used in the SIP (structural insulated panel) industry and already has industry acceptance. The adhesive that is used to secure the nonmetal truss inside of the wood members of the Tstud™ is also currently used in the construction industry and passes ASTM D2559, as a heat and moisture resistant adhesive. The ASTM D2559 is required for use in members that could and would be used in headers and top plates, for the protection of fire personal and the inhabitants of the occupied space. Underwriters Laboratory (UL) has tested a prototype of the Tstud™ and has concluded that the Tstud™ passed as a Class A fire rated member. A testing program is being implemented with UL for use of the Tstud™ as a Fire Class Rated Assembly.

Until a E119 Assembly Test is completed, and additional E84 Steiner Tunnel tests are completed, the Tstud™ cannot be sold with a fire rating. More updates will follow.

 Burn Test: Tstud™ (left) vs a 2x6 (right).

Burn Test: Tstud™ (left) vs a 2x6 (right).

More information coming soon! 

The Tstud™ offers protection from the harmful effects of mold, rot (fungal decay) and wood ingesting insects including Formosan termites. The Tstud™ is made to be used on concrete and in infestation areas of North America.

Greater energy efficiency means smaller furnaces and air conditioning equipment. By replacing traditional framing with Tstud™ framing, homeowners can reduce their utility bills by as much as 12% - easily covering the extra cost of building with the Tstud™ in two years or less.

Also, the Tstud™ minimizes sound transmission, providing a 90% improvement in noise control over 2x6 framing. That means no extra cost for noise control measures in exterior walls next to roadways or interior walls around bathrooms or laundry rooms.


 Burn Test: Tstud™ (left) vs a 2x6 (right).