Yes, plywood is allowed to protect the rigid insulation.

Can Plywood be used as a thermal barrier?

An example of a thermal barrier is 1/2” sheet rock, 1/4” plywood or particleboard, and some fire proof coating. Ignition Barrier – a product that prevents the ignition of the product which it is applied to from a spark, or from direct heat, but does not protect from direct flame over a period of time.

Does rigid foam need to be covered?

Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. This wall covering must have a minimum fire rating to protect the insulation from quick combustion during a fire.

What can I use to cover foam board?

Furring can be installed over the rigid foam board then gypsum boards are screwed through the furring. If the rigid foam board is too thick for screws, the gypsum board can be fastened using foam board adhesive.

Is rigid foam flammable?

Rigid polyurethane and polyisocyanurate foams will, when ignited, burn rapidly and produce intense heat, dense smoke and gases which are irritating, flammable and/or toxic. As with other organic [carbon based petrochemical] materials the most significant gas is usually carbon monoxide.

Is foam board fire resistant?

While many modern foam insulating products do not themselves readily support combustion (that is they don’t catch fire and burn alone) they may give off thick acrid or toxic black smoke in a fire, making it difficult to safely exit the burning building.

Is foam insulation fire proof?

Like many materials found in a home or building, spray foam can ignite and burn if exposed to a sufficient heat source. Foam insulation should be considered combustible and handled accordingly.

What type of foam is fire resistant?

Silicone foam is flame-retardant, self-extinguishing & can withstand 2100 degrees F flame for more than 10 minutes without burning.

Is plywood a 15 minute thermal barrier?

The APA has reported that 23/32” western species plywood or OSB will meet the 15 minute thermal barrier. This report additionally states that, according to IBC section 2603.4. 1.5, 15/32” plywood or OSB prescriptively meet this thermal barrier requirement for roof assemblies.

How do you make foam fire resistant?

Quote from the video:
Quote from Youtube video: It's it's a little cleaner and then I have some soap so the first thing I get when you mix baking soda and the vinegar it produces carbon dioxide and you could use that to put out a fire okay.

Can foam board insulation catch fire?

Spray foam insulation will ignite at 700 degrees Fahrenheit. This means it is defined as “combustible”. This insulation should be treated and cared for as a combustible material.

Is foam board insulation combustible?

While the code requirements for continuous insulation help to improve efficiency, they raise another challenge: the foam plastic insulations commonly used for continuous insulation—polyisocyanurate aka polyiso, expanded polystyrene also known as EPS, extruded polystyrene aka XPS and spray polyurethane foam or SPF—are

How do you cover foam insulation boards?

Quote from the video:
Quote from Youtube video: Cover it right away with an interior finish material such as drywall.

Does rigid foam insulation need vapor barrier?

Foam insulation usually does not require a vapor barrier. For some foam insulation types, such as closed-cell spray foam and foam board insulation, the insulation itself stops the movement of most water vapor.

How do you protect rigid insulation?

Insulation Protection

The most common approach is to apply a stucco-like “parged” finish with a surface-bonding cement. These finishes range from a thin paint-on coating to a thick acrylic-modified mortar applied over hardware cloth or metal or fiberglass lath.