Asked by: Samual Lenhart
home and garden indoor environmental quality

Does spray foam stick to radiant barrier?

Last Updated: 13th February, 2020

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Check your shingle manufacturer's warranties as some void or limit warranties or require special roof details when foam is used on the underside of the sheathing. Spray foam insulation doesn't protect attic spaces from radiant heat, but does protect them from convection and conduction.

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Beside this, can you spray foam over radiant barrier?

By combining radiant barrier foil with spray foam insulation you create two defenses for reducing heat flow into your home. So you can't just glue it to the shingles and add the foam afterward. The barrier reflects only radiant heat, which forms only in an air space.

Additionally, does spray on radiant barrier really work? The best radiant barrier spray spray is only available to commercial contractors, and is an environmentally safe, water-based low-e paint called HeatBloc-75, Radiance e. 25 or Lo/MIT. When the paint is installed correctly, it will reflect about 75% of the radiant heat and can be a very good product.

Then, is spray foam better than radiant barrier?

Open-celled spray-in foam insulation is by far superior to a traditional radiant barrier which is a foil-like thing that you can either tack to the rafters or lay on the floor of your attic. Radiant barrier laid on the attic floor is better than painted on radiant barrier.

Do I need a radiant barrier with a metal roof?

If you are installing any type of roof that has an air space (either built in by the shape of the tiles or because of a batten system), then you should most definitely install a radiant barrier! These types of roofs are usually clay tile or slate roofs, metal shingle roofs & some standing seam metal roofs.

Related Question Answers

Reatha Oggionni

Professional

Is Radiant Barrier worth the money?

Some studies show that radiant barriers can reduce cooling costs 5% to 10% when used in a warm, sunny climate. The reduced heat gain may even allow for a smaller air conditioning system. In cool climates, however, it's usually more cost-effective to install more thermal insulation than to add a radiant barrier.

Bertran Bekshansky

Professional

Which way should radiant barrier face?

Research by the Florida Solar Energy Center (FSEC) found that radiant barriers work best when installed with foil-face down (towards the building interior) and applied under the roof sheathing.

Mbarek Egues

Professional

Does Radiant Barrier need air space?

Because a radiant barrier needs an air space on at least one side, installing it directly below felt and shingles will NOT allow the radiant barrier to block any radiant heat. Instead, the heat from the shingles and felt will conduct all the way through the barrier, into the attic, and eventually in the living spaces.

Yusif Nicuesa

Explainer

What is the R value of radiant barrier?

What is the R-value of your radiant barrier? Radiant barrier on its own has NO R-value; R-value is attributed to materials slowing conductive heat. AtticFoil™ works to block radiant heat (97%) coming in to the attic by stapling it to the rafters, but it has no R-value.

Dimka Rahletzky

Explainer

Do you need insulation with radiant barrier?

Insulation is great at reducing convective heat transfer, while also reducing some radiant and conductive heat transfer as well. This allows the radiant barrier to reduce heat gain in the summer and heat loss in the winter, thus reducing the net heating and cooling needs of the structure.

Ganesh Heydenblut

Explainer

Is attic spray foam worth it?

Spray foam insulation is an incomplete name. It really should be called spray foam insulation and air barrier. A properly done spray foam job not only insulates but also greatly reduces the air leakage of a home. If you leave the existing insulation in the attic, it interferes with the foam installation.

Zi Chim

Pundit

How much is radiant barrier cost?

Typical costs: Rolls can cost about 10 to 25 cents per square foot for single-sided radiant barrier, or $150-$375 for enough for a typical 1,500-square-foot attic; and it can run 15 to 50 cents a square foot for double-sided radiant barrier, or $225-$750 for 1,500 square feet.

Shuwei Streitburger

Pundit

Does radiant barrier sheathing work?

When utilizing OSB radiant barrier sheathing, you can reflect up to 97% of solar radiation which translates into an attic heat reduction of up to 30°F. Radiant barrier roof sheathing helps to improve comfort in the building interior during the warm summer months and reduces energy costs.

Chaimae Abels

Pundit

Kallie Delages

Pundit

Does radiant barrier damage shingles?

By blocking the mass insulation from absorbing heat and emitting it back to the roof, a radiant barrier can decrease the roof temperature at night by over 5 degrees. In short, radiant barrier should not void any shingle manufacturer's warranty and will not damage roof shingles or any other roofing material.

Rifat Bouquet

Pundit

Is there such a thing as insulating paint?

Paint additives that claim insulating qualities have been marketed since the late 1990s, but energy research organizations have not confirmed their insulating value. For its part, the U.S. Environmental Protection Agency (EPA) does not recommend using paints or coatings in place of traditional bulk insulation.

Liguang Buitrago

Teacher

Do insulating paints work?

“Scientific studies show” is also a go-to phrase used by the insulating paint market. It is claimed that thermal insulation paint works in a different way to traditional insulation techniques, in that it prevents heat from leaving the room.

Arielle Ronconi

Teacher

Is there a paint that reflects heat?

Heat Reflective Paint. However, the technological expertise of ASTEC Paints opens up colour options in black or deep tone for roofs and surfaces that would reflect solar heat and stay cool.. The heat reflective paint lessens the 'urban heat islands' effect, which allows cooler buildings.

Alberto Huberty

Teacher

Can radiant heat be reflected?

A radiant barrier reflects heat radiation (radiant heat), preventing transfer from one side of the barrier to another due to a reflective, low emittance surface. In building applications, this surface is typically a very thin, mirror-like aluminum foil.

Shella Enthofer

Reviewer

What is e barrier?

E-Barrier is a new radiant barrier coating from Sherwin-Williams that contains microscopic reflective particles that help keep radiant energy from transferring in or out of homes or buildings.

Billal Waechter

Reviewer

Can you paint reflective insulation?

The foil facing on insulation is nonporous, making it ill-suited for adhesion. Once the foil face is properly prepared, it will accept a new finish. Apply the paint in a particular way, or you may end up with subtle flaws in the finish coat.

Lou Makhnev

Reviewer

What underlayment is best for metal roof?

List of Top-Rated Underlayments for Metal Roof
Product Price
Tyvek Protec 160 Roof Underlayment - 4' x 250' - 1 Roll $163.23
Grace Tri-Flex XT 48-in x 250-ft 1000-sq ft Synthetic Roof Underlayment $154.95
RhinoRoof Synthetic 15lb. Felt Roofing Underlayment - Pallet of 67 Rolls (67) $4,254.50

Argiñe Breitenstein

Reviewer

Is it recommended to insulate under metal roof?

The best material for use with metal roof insulation is in the form of foam batting. This foam can be used on either the outside or the inside of the sheathing. You will want to use this over rolled up or spray insulation because of the way that it lays flat and it can be easily installed under the metal roofing.

Discusion Gehricke

Supporter

How do I stop my metal roof from sweating?

The five key points to stop your metal roof sweating are
  1. Good roof ventilation. The key to getting condensation to evaporate is air flow.
  2. Roof pitch.
  3. Keep the inside of the shed dry.
  4. Insulation.
  5. Anti-condensation layer.