Fanfold Insulation Under Vinyl Siding

Like bob said it helps with sound insulation.

Fanfold insulation under vinyl siding.

When every penny counts you can rely on the performance of our most economical fanfold siding underlayment. Also it is a vapor barrior on boyh sides of the board. It also helps to level the walls so you get a better smoother siding job. Below are some of the design details along with the benefits.

It also serves as an air barrier. 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. Fan fold is typically sold in 1 4 inch by 4 foot by 50 foot sections and is installed horizontally across the existing siding to level out irregularities before re siding with vinyl. 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.

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. 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. 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. I have not seen any studies that show how well tape adheres to foam over the long haul.

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. Products can be used on wood steel framing or concrete walls. Installing foam board insulation under vinyl siding today more than ever before homes are being built with foam board insulation installed on the outside of the sheathing and under the siding. The products are easy to handle score cut and install and no special tools are needed.

This detail is used with both new construction and also with renovation work. 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. Generally referred to as rigid foam insulation this type of foam insulation is also called foam board foam plastic insulated. This creates a horizontal seam every 4 feet.