Fanfold board is worth the cost and effort to install behind vinyl siding.
Fanfold insulation for vinyl siding.
Generally referred to as rigid foam insulation this type of foam insulation is also called foam board foam plastic insulated.
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.
The exterior insulation also helps keep the siding all vinyl siding leaks further away from the exterior sheathing.
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.
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.
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.
When every penny counts you can rely on the performance of our most economical fanfold siding underlayment.
By installing insulation on the outside of the framing it causes the location of the dew point to move to the outside of the wall assembly.
This creates a horizontal seam every 4 feet.
Also it is a vapor barrior on boyh sides of the board.
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.
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.
It also helps to level the walls so you get a better smoother siding job.
These products are also perforated to allow potentially harmful moisture vapor to escape so that it does not become trapped in the wall.
It also serves as an air barrier.
I have not seen any studies that show how well tape adheres to foam over the long haul.
This reduces the likelihood of condensation within the wall cavity.
Like bob said it helps with sound insulation.
Products can be used on wood steel framing or concrete walls.
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.
