Metal Roof Insulation - High R, Vapor and Radiant Barrier

metal roof with Prodex Total Insulation

Insulating A Metal Roof - Solving Condensation, Cold and Heat

Prodex Total Metal Roof Insulation = Insulation  + Radiant Barrier Vapor Barrier + Air Barrier

All in One Product. One solution to Cold, Heat and Condensation - You'll be warm in winter, cool in summer and dry all the time.

prodex insulation cross sectionProdex Total Insulation - 5mm (0.2") closed cell polyethylene foam covered on both sides with reinforced reflective foil facing. Roll Sizes : 

Prodex Total 10M New TagProdex Total 10M - R22. Twice as thick as regular Prodex Total.  10mm (0.4") closed cell polyethylene foam covered on both sides with reinforced foil facing. 

Any roof that uses fiberglass insulation rather than Prodex Total will have moisture issues (typically hidden behind facing), Loss of R-value (consequence of the moisture) and heat gain.


metal roof insulation - Prodex

Condensation - It can seem like a tropical rain forest inside an unprotected metal roof. It's worse on those days where there is a greater contrast between temperatures at night vs. day. The morning sun hitting the cool metal sheeting will create a drip. When warm air comes in contact with the cool metal roof sheet, condensation occurs. A temperature difference between the outside and inside of your building creates condensation - Similar to what happens when you have a cold can of beer outside on a hot day.

Radiant Heat - Mid-summer sun rays hitting the metal roof sheeting radiates downward (inside). It can make it unbearably hot and humid inside. The metal skin magnifies the heat of the summer and frigid temperatures of the winter. Metal is a very good conductor of heat and cold. In hot weather, metal framing and sheeting rapidly radiate the sun's heat into a building.  

Cold - Winter temperatures turn metal roof sheeting cold. The cold sheeting chills the inside of your building making it like an ice box  - colder inside the building than out.

Under Metal Roof Insulation That Loses R-value Due to Moisture

Once fiberglass insulation gets wet (and it will get wet, due to condensation) it will lose R-value! Water trapped between fiberglass insulation and the exterior of a building will also cause mold, fungus growth, rust and oxidation - Conditions that will degrade the metal and shorten the service of the structure. In addition, fiberglass insulation does not prevent radiant heat transfer (the primary source of heat-flow in and outside your building).

Take a look at the white vinyl facing the next time you're under a metal roof - It will be either sagging, or sagging and flaking. This is due to the added weight of water. Behind the white vinyl is a wet, mold filled blanket that will eventually cause the white vinyl to crack and fall off. At some point, when you're exposed to the toxic fibers, you'll be forced to remove the insulation - Hopefully before it does too much damage to the metal sheeting or framing. If you insist on using fiberglass, use it in conjunction with Prodex Total, so the Prodex can keep the moisture out of the fiberglass.

Once metal sheeting gets cold it creates a situation where it's colder under the roof than above. To combat this you need an insulation that doesn't lose its thermal protection (like fiberglass) when you need it most - Cold damp conditions!

Insulation For Steel Roofs That Doesn't Protect Against Radiant Heat Transfer

Like fiberglass, spray foam insulation doesn't protect against radiant heat transfer. Without a radiant barrier, when your roof gets hot it radiates solar-generated heat down. This often results in it being hotter in your building  than out. Since open cell foam providers suggest you supplement open cell foam with a vapor barrier. Why not get the vapor barrier, insulation and radiant barrier all in one product?

Prodex Total Roof Insulation Solves Condensation, Heat and Cold Challenges

Prodex Total Eliminates Condensation Under Metal Roofs

condensation in metal building

Prodex eliminates the moisture (condensation) from forming under the roof metal sheeting. It does it by making the temperature of the metal sheeting on the building approximately the same on the inside as the outside. When the heat or cold from outside comes through the metal skin it hits the outside aluminum facing of Prodex and is reflected back upwards through the underside of the metal sheeting. This process keeps the metal sheeting temperature consistent on both sides. In addition, the inside layer of aluminum in Prodex reflects away the heat (heater) or cold (air-conditioning) from inside the building, from getting to the metal skin. This also helps in preventing condensation. 

Prodex Total Prevents Radiant Heat Transfer Through Metal Roofs Buildings

Prodex reflects 97% of the radiant energy (primary source of heat flow) that strikes it - Which also protects your animals from Black Globe Effect. Prodex also reflects back the heat inside your steel building. Each unit of radiant heat energy that is reflected away from your barn in the summer, and each unit that is reflected back during the winter, means less operation of your heating and air conditioning system - Less wear and tear on your equipment - Less money you pay in utility costs. Fiberglass and spray foam insulation do not prevent radiant heat transfer.

Prodex Total Keeps You Warm Under Your Metal Roof

The Prodex Total R-value is not affected by humidity. This feature cannot be over emphasized. There will always be some humidity in a metal building and your insulation must work in these conditions.

What Makes Prodex Total Insulation Superior to Fiberglass and Spray in Metal Roofs?

  • R-value unaffected by humidity
  • Prevents 97% of radiant heat transfer
  • Vapor barrier
  • Prevents condensation
  • 90 degree Celsius (194 Fahrenheit) contact temperature rating
  • Does not promote mold or mildew
  • Does not provide for nesting of rodents, bugs or birds
  • Seals around nails (no leak)
  • Made with 100% recyclable virgin raw materials. 

Comparison Chart Of Metal Roof Insulation

chart comparing metal roof insulation

How To Insulate A Metal Roof - Install Instructions

It's a lot easier and less expensive to install a 5mm roll of Prodex than a bulky 6 inch roll of fiberglass or spray foam. Pinching 6 inches fiberglass between the framing and sheeting is not easy. It's really tough having to use a wire mesh to hold fiberglass in place on an existing building. Spray foam is not DIY friendly.

Prodex Total can be installed before or after your metal sheeting. For fastest and easiest installation, install before applying your sheeting.

New Roofs: lnstall the insulation over your purlins and girts (sandwiching it between the sheeting and the purlins/girts). Existing Roofs: lnstall the insulation on the underside of your purlins and girts.

Installation methods I-beam frames : Installing Over Wood Decking

More benefits of Prodex Total Insulation

Protects Content From Vapor

Prodex is a class 1 vapor barrier. A vapor barrier (moisture barrier) refers to any material that prevents moisture from passing through the walls or roof of a building. This material can be plastic or better yet, Prodex Total Insulation - 0.2 inch (5mm) and 0.4 inch (10mm) closed cell polyethylene foam covered on both sides with .0012-inch (00.03mm) reflective foil facing. Prodex Total Insulation (Vapor Barrier, Class 1. perm<0.1 ).

Prodex Insulation Prevents Rodents, Bugs and Birds from Nesting

Unlike fiberglass insulation, Prodex does not provide for the nesting of rodents, bugs and birds. Rodents, bugs and birds aren't able to digest the aluminum.

Prodex Total Deadens Sound of Rain and Hail

Metal roofs exaggerate the sound of rain and hail. Prodex does an excellent job of deadening this sound.

Increased Lighting Efficiency

Prodex provides a bright, attractive finish to your building. It reflects the light, making it easier to light the building interior.

How do I know this is a great product?

Prodex Total is ICC-ES recognized. BBB link bottom right of every page. Real-time customer comments on every product page. Independent reviews (bottom right of every page).

To meet the unique insulation requirements of a metal roof you need a total insulation system -  Prodex Total Insulation = Insulation + Radiant barrier + Vapor barrier.

Prodex Metal building insulation - grey frame Prodex insulalation in metal roof - under construction insulation quonset hut - metal building

prodex insulation cross sectionMetal Roofing Insulation Rolls

48 Inch (4 ft. x 175 ft., 700 sq. ft.) 
72 Inch (6 ft. x 100 ft., 600 sq. ft.) 
Fast Action (4 ft. x 175 ft., 700 sq. ft.). Fast Action is identical to 48 Inch with the exception of having adhesive running 175 ft. on one side of roll. The adhesive is not for attaching the insulation to the surface - It is for sealing the seams. No need for seam tape. 

White (4 ft. x 175., 700 sq. ft.)

10M (4 ft x 85.3 ft., 341 sq. ft.) Twice as thick as regular Prodex Total. 
24 Inch (Two rolls of 2 ft. x 175 ft., 700 sq. ft.)  
16 Inch (Three rolls of 16 in. x 175 ft., 700 sq. ft.)

5 Reasons To Buy Prodex Total Metal Roof Insulation

  1. Independent reviews at Site Jabber. Site Jabber is the leading community of online business reviewers. The community helps consumers find great online business and avoid scams. The community has grown to over 850,000 members and has reviewed over 58,000 online businesses. Site Jabber was developed in part with a grant from the National Science Foundation.
  2. BBB report. For over 100 years, BBB has set the standard for ethical business behavior. We're proud to maintain an "A to A+" rating. This rating takes into account a company's size in its relation to complaints. We're proud to maintain an "A to A+" rating. We've been accredited since March 15, 2004
  3. Prodex Insulation Reviews on every product page
  4. ICC-ES Recognized - ICC-ES is an evaluation service that takes independent test data for a variety of products and analyses it against a uniform Acceptance Criteria that is recognized internationally.
  5. Over 4 billion square feet sold worldwide.

Reviews - What to Believe

rooofr1: Monday, May 13, 2013

We have been using your roof insulation for the past few years with great satisfaction-we use it under all metal roofs applied to deck with furring strips between metal and roof deck.unbelievable difference in heat and outside noise-we also use this behind any siding we install using same installation process. i have been in the roofing business for over 45 yrs in south texas and highly recommend this product and company. my orders are filled and shipped at what i would say a high rate of speed. thanks

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 Metal Roof Insulation Cost

  • Roll Pricing on every product page
  • Shipping calculator on every page in blue bar
  • For Discount volume metal roof insulation cost or to order click the "Order Here or Get A Quote" button 

metal building insulation prices 

Updated April 24, 2019


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