Fanfold Insulation Under Vinyl Siding

In reality rigid foam board which sometimes comes in fanfold usually only has an insulating factor of r 1 and does not add any appreciable insulation effect to your home.

Fanfold insulation under vinyl siding.

Home accessories 3 8 fanfold insulation sheathing underlayment 3 8 fanfold insulation sheathing underlayment cellofoam s poly shield heat laminated sheathing. It also serves as an air barrier. Installing foam insulation under vinyl siding is a wise choice for homeowners who are seeking to protect their homes against moisture infiltration as well as improve energy efficiency. Available in fanfold bundles where the insulation is crimped and folded to ensure it lays flat the underlayments are made of closed cell polystyrene which creates the ultra smooth flat and durable surface for adhering the vinyl siding.

The combination of those 4 effects can sometimes cause an unexpectedly big gain in efficiency. And it is an air barrier if tape seamed rightt althought the tyvek did that already. Is the fan fold foam an adequate weather resistive barrier. That is what i have always used and i tape the joints.

Offers tough poly facers for added strength and durability important in storing handling and installation. A corresponding editor paul fisette responds. Fanfold when every penny counts you can rely on the performance of our most economical fanfold siding underlayment. It is called fanfold due to the fact that it is stored folded up like a handheld fan often used years ago which makes it easier to unfold when it is ready to be installed on a home.

I just added these intructions. Before installing vinyl siding over existing wood siding we first install a layer of fan fold foam insulation. Rigid foam will shed any water that gets past leaky vinyl siding. And even though some manufacturers call it rigid foam insulation for the purpose of vinyl siding it basically has the same insulating value as a piece of plywood.

To be an effective weather resistive barrier though the seams of the fan fold must be carefully taped since any seam can provide a pathway for water to reach the structure under the foam. You can add r0 5 again if the fanfold makes airgaps over clapboards below. I have never heard of putting anything under or over maybe you guys are using the wrong fanfold insulation try greenguard or polar wrap. Tyvek under 1 4in foam for vinyl siding.

It also reduces heat bridges through the 2x4 studding.