The RCC Classroom (Radiant Control Coatings)

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The RCC Classroom (Radiant Control Coatings)

A group where energy professionals can learn about all the different energy saving aspects of RCCs.  I have worked with one particular RCC for 30 years.  I have amassed alot of information I can share.  Everyone knows, accepts and understands how RCCs work as a 'Cool Roof' coating.  However, that seems to be where the knowledge on these products different energy saving applications abruptly stops.  I hope to change that with this group. 

There are over 300 protective coatings out there and they all say they save energy. Out of nearly 4,000 members of this forum, only one has stepped up and said he works with an RCC as well.  I hope others will add their experiences with these coatings as well.

Please understand that I do not place myself above or think I am smarter than ANYONE with what I know.  I am an authority on the coating I have worked with and I am willing to share that experience. 

How this coating performs, my website and archive

 

Members: 16
Latest Activity: May 13, 2015

 

 

Discussion Forum

Rooftop A/C units and exposed ductwork

Started by Hal Skinner. Last reply by Hal Skinner Sep 22, 2014. 12 Replies

How our ceramic based RCC works

Started by Hal Skinner. Last reply by Hal Skinner Oct 9, 2014. 3 Replies

Combining energy efficiency with fire safety

Started by Hal Skinner. Last reply by Hal Skinner Aug 12, 2014. 2 Replies

Perm rating

Started by Hal Skinner Nov 21, 2014. 0 Replies

Our RCC and retaining heat

Started by Hal Skinner Nov 11, 2014. 0 Replies

Our RCC's performance in Yuma, AZ

Started by Hal Skinner Oct 25, 2014. 0 Replies

Improved acoustics

Started by Hal Skinner Sep 21, 2014. 0 Replies

Walmart goes green in Texas

Started by Hal Skinner Sep 17, 2014. 0 Replies

Our RCC to different types of roofs

Started by Hal Skinner Aug 9, 2014. 0 Replies

A little clarification

Started by Hal Skinner Aug 8, 2014. 0 Replies

Using an RCC to stop interior mold.

Started by Hal Skinner Aug 4, 2014. 0 Replies

Comment Wall

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Comment by Kurt Shafer on September 2, 2014 at 4:30pm

Wow, I am very sad to hear about your eyes. 

Would have been super to do that comparison.

Good luck. 

Perhaps I should do this experiment...What RCC do your recommend and can I apply it?

Comment by Hal Skinner on September 2, 2014 at 4:14pm

My dads house has an attached garage.  It was converted to living space around 20 years ago.  The interior walls and ceiling are coated with our RCC.  It is by far the coolest room in the house.  HE has even commented on how much cooler it is than the rest of the house.

I have asked him many times if I could do the same in the rest of the house.  He just cannot understand how it could work on the inside of a building.  He has coated the AC unit and ducts at his church, dropped the air temp coming ion by 12 degrees.  He coated a friends large well water tank.  HE KNOWS IT WORKS ON THE OUTSIDE. 

No room in his attic left to go in and spray.

 

Due to diabetes hurting my vision and two lousy optathamologists missing with their lasers and making me legally blind, I am out pf the active role with this coating.  Cant climb a ladder or walk on a roof anymore, I'll fall off.

Thats why I have the time to be on here.

Hafta pass on that bet, sorry. 

 

Comment by Kurt Shafer on September 2, 2014 at 3:34pm

Hal, do I see a terrific chance for you to show us all the power of your RCC?

Your father's home can be your demonstration platform just as my home is being set up as a demo for radiant foil. 

I propose a wager. You put in your RCC and see what a difference it makes next time it is 98 out. Then put in foil and see what happens. 

I will wager $100 that atticfoil.com foil beats your RCC.

Kurt

Comment by Hal Skinner on September 2, 2014 at 3:08pm

That same RCC, used as paint on the ceiling of living space, will do the same as if it was applied to the roof or the underside of the roof decking.  It will not let that heat energy radiate down into the living space.  THAT is how a Radiant Control Coating is SUPPOSED to work.

Comment by Craig Bird on September 2, 2014 at 2:23pm

Correct, that is exactly what I said

Comment by Hal Skinner on September 2, 2014 at 1:54pm

At 1.7% enterng the structure, that Radiant barrier is now going to allow the R-rated insulation/s to perform their function on a greatly reduced temperature scale.

It was 98 degrees here yesterday.  I went to my 80 year old fathers and watched the Giants game.  About the 4th inning, around 4 pm, it was awful in that old house.  We sweated. 

He has blown in insulation in the attic with 2-levels of what I believe he said was R-30 on top of that.  But the house gets God awful hot and nobody wants to come over because of it.

IOh well.  He's 80 and used to it I guess.

Comment by Craig Bird on September 2, 2014 at 1:35pm

And how much of that 1.7% of the suns energy that got through the RB or RCC gets into the house, will depend on the R-value of the insulation in the ceiling.

Comment by Hal Skinner on September 2, 2014 at 1:14pm

OK.  This might be rudamentary here.  I want to make sure everyone understands how SOLAR REFLECTIVITY (se) and  THERMAL EMISSIVITY (TE) work and why understanding both is so important.

I will explain it as it was explained to me many years ago by an energy lab scientist;

Every material known to man has it's own measurable levels of SOLAR REFLECTIVITY and  THERMAL EMITTANCE. 

A percentage of the heat energy from the sun (the solar load)  is reflected away from the materials surface back into the atmosphere.  The remainder of that heat energy enters the material.  The material then emits a percentage of that energy back in the direction it came from.  If you know the reflectivity and emissivity of the material, its simple math to determine what percentage of the solar load actually enters the structure.

Example;  Reflectivity - 0.83 - (83%) 17% enters the material.

                 Emissivity - 0.90  (90%)  90% of that 17% is emitted back out.

That leaves 1.7% of the sun's heat energy that gets past the material and enters the structure.

Some RCCs carry those nymbers.  Thats why they are so effective.

Some of them are just as effective when used on the interior of buildings vs conductive and radiant heat energy.

 

The RCC classroom

 

 

 

Comment by Craig Bird on September 2, 2014 at 1:04pm

Hal - I would disagree that radiant heat "goes through" fibrous insulation. Radiant heat transfers only through air. When it hits a solid, it is either absorbed or reflected. Since fibrous insulation does not have a very high reflectivity, most of it gets absorbed. At that point, you are battling convection/conduction. This is the reason that radiant barrier savings go down significantly when attics have a high amount of insulation at the attic floor. Research shows that the highest savings from radiant barriers occur when low levels of insulation are present in the attic and lowest savings when high levels of insulation are on the attic floor. The radiant barrier is always going to help but the amount of help depends on how fast that converted radiant heat goes through the given depth of insulation.

Comment by Hal Skinner on September 2, 2014 at 12:43pm

Hi KLurt.

I would isagree with the comment that the attic floor is heated by the convection. 

The R-rated insulation works against conductive and convective heat.  It does little to nothing vs radiant heat and that is what goes through the R-rated insulation and heats the ceiling / attic floor.

 

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