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Metal Building Insulation: High R, Vapor and Radiant Barrier

Thumnail of Prodex on ceiling of metal building

2 Don'ts When Buying Insulation For Metal Buildings


1. Don't buy insulation that loses R-value if wet. Insulation gets wet in metal buildings due to condensation

insulation for metal buildings, wood framing, thumbnailCondensation In A Metal Building

It can seem like a tropical rain forest inside an unprotected metal building. 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 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. 

Condensation Damages Contents In A Metal Building

Protect your valuable contents from damaged caused by moisture.

condensation in metal structures

Using Prodex Total as your metal building or warehouse insulation will eliminate the moisture (condensation) from forming on the 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 reflective 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 reflective layer of Prodex metal warehouse insulation keeps the heat (heater) or cold (air-conditioning) inside the warehouse from getting to the metal skin. This also helps in preventing condensation.

Fiberglass Losing R-value And Cracking In Metal Building

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).

fiberglass torn insulation under metal roof

Take a look at the white vinyl facing the next time you're in a metal building - 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 framing. Avoid an insulation that collects moisture, attracts mold, cracks and needs to be replaced. If you insist on using fiberglass, use it in conjunction with Prodex Total, so the Prodex can keep the moisture out of the fiberglass.

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. 

We repeat! If fiberglass is used as metal building or pole barn insulation rather than Prodex Total, you'll have moisture issues (typically hidden behind facing), Loss of R-value (consequence of the moisture) and heat gain. 

2. Don't buy insulation that that doesn't stop radiant heat transfer. 

Radiant Heat Magnified in a Metal Building

Mid-summer sun rays hitting the metal 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.

Fiberglass and spray foam don'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. Prodex Total steel building insulation solves radiant heat problems. Since open cell foam providers suggest you supplement open cell foam with a vapor barrier. Why not use a steel building insulation that includes a vapor barrier and a radiant barrier? The cheapest way to insulate a metal building is to use one product that includes everything!

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.

Your metal building insulation shouldn't only protect from cold - It also must protect from radiant heat and condensation.

Colder In A Metal Building Than Out

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

Features of The Best Metal Building Insulation 

  • R-value unaffected by humidity
  • Prevents 97% of radiant heat transfer
  • Vapor barrier
  • Air Barrier
  • Prevents condensation
  • 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. 

A Complete Metal Building Insulation System 

Insulation  + Radiant Barrier Vapor Barrier + Air Barrier 


How To Insulate A Metal Building

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

New Buildings: lnstall the insulation over your purlins and girts (sandwiching it between the sheeting and the purlins/girts). 

How to Insulate An Existing Metal Building

Easy - Attach the insulation under the purlins and girts. Visit How to insulate an existing metal building
It's a lot easier and less expensive to install a 5mm or 10mm 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.

Metal Building Insulation Options - Compare Fiberglass, Spray Foam and Bubble vs. Prodex Total

chart comparing Prodex Total  Metal Building Insulation

More Benefits of Prodex Total Metal Building Insulation

Protects Contents 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 closed cell polyethylene foam covered on both sides with reflective reinforced foil facing. Prodex Total Insulation (Vapor Barrier, Class 1. perm<0.1). 

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.

Deadens Sound of Rain and Hail

Metal skin on a building can exaggerate the sound of rain and hail. Prodex has an excellent sound deadening properties. 

Increased Lighting Efficiency

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

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

Confidence To Buy Metal Building Insulation Here

  1. Independent I4L and Prodex Insulation reviews at Site Jabber. Site Jabber is the leading community of online business reviewers. The community helps consumers find great online companies 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 million orders totaling more than 4 billion square feet of insulation sold.

Insulation4Less Reviews Some review sites are pay to play :(

Prodex Total Logo with features

Summary of why is Prodex Total the best metal building insulation?

Prodex Total stops condensation, air and heat transfer. It's R-value not affected by humidity. It installs easily. It does not provide for nesting of birds or rodents. It seals around punctures. AND it does not promote mold or mildew! 

One solution to Cold, Heat and Condensation - Warm in winter, cool in summer and dry all the time. 

Metal Building Insulation For Sale Roll Sizes

prodex insulation cross section

Prodex Total 5M Plus R17. 5mm (0.2") closed cell polyethylene foam covered  on both sides with reflective reinforced foil facing.

prodex insulation cross section

 White Prodex Total 5M PlusR15.3. 5mm (0.2") closed cell polyethylene foam with reflective reinforced foil facing on one side and plastic white finish film on the other side.


Prodex Total 10M New Tag

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


Metal Building Insulation Pricing | Buy Metal Building Insulation

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metal building insulation prices  

Updated October 18, 2019



William Matthews: Saturday, August 15, 2009

I finally completed my 60" X 42" steel building using your insulation between the steel studs and the metal sheeting. I was amazed at the temperature difference. The metal is not allowed to adversely heat the building and the temperature is cooler than under a shade tree because of the breeze created within the door openings. The reflective foil also provides a tremendous amount of light reflection inside the building creating a very bright look inside. I am amazed and presently surprised that the thin foil actually worked so well.

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Customer Reviews
pappyyj: Friday, February 05, 2010

I installed Prodex in my 40'x40'x14' Steel garage when I bought the building it came with the 4" thick 6' wide white vinyl that was hard to work with because of it's weight and bulkiness. The weather was rainy and it was just my wife and I installing the insulation and steel sheeting. Trying to find something easier to work with I found your product I ordered enough to line the entire garage it was grate to work with. When the garage door company cam to install the garage doors on January 02/2010 the temperature outside was 10 degrees and windy. After they had the door tracks fastened enough to hold the doors in place they light there portable gas salamander I was impressed with how quickly it warmed to 40 degrees and healed the heat after they turned it off.

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