Fanfold Insulation Under Vinyl Siding

It also serves as an air barrier.

Fanfold insulation under vinyl siding.

And it is an air barrier if tape seamed rightt althought the tyvek did that already. The q series products have an extruded polystyrene foam xps core with high impact polystyrene capsheets on both sides which make it one of the most durable products currently available. It also reduces heat bridges through the 2x4 studding. Is the fan fold foam an adequate weather resistive barrier.

A corresponding editor paul fisette responds. Fanfold when every penny counts you can rely on the performance of our most economical fanfold siding underlayment. Rigid foam will shed any water that gets past leaky vinyl siding. 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.

Products can be used on wood steel framing or concrete walls. 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. Foamular extruded polystyrene xps rigid foam insulation offers a comprehensive line of products in a wide choice of sizes thicknesses and edges with a lifetime limited warranty for the life of the home or building.

Exterior fanfold insulation is the foam type of insulation that is applied between your home s exterior and the siding and it offers some protection from moisture in addition to creating a layer of thermal insulation. 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. The products are easy to handle score cut and install and no special tools are needed. Offers tough poly facers for added strength and durability important in storing handling and installation.

Dupont has said on their website and product flyers that if using both fanfold and housewrap and committed to both put the tyvek housewrap over the fanfold but they actually recommend assuming the insulation is totally closed cell with very low absorption rate putting the insulation directly under the siding overlying dupont drainwrap which is designed to provide a better drainage path between the two than regular housewrap. Before installing vinyl siding over existing wood siding we first install a layer of fan fold foam insulation. Home accessories 3 8 fanfold insulation sheathing underlayment 3 8 fanfold insulation sheathing underlayment cellofoam s poly shield heat laminated sheathing.