These products are also perforated to allow potentially harmful moisture vapor to escape so that it does not become trapped in the wall.
Fanfold insulation for vinyl siding.
The exterior insulation also helps keep the siding all vinyl siding leaks further away from the exterior sheathing.
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.
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.
Fanfold board is worth the cost and effort to install behind vinyl siding.
It also helps to level the walls so you get a better smoother siding job.
If you have ever seen vinyl siding and the laps looked dirty all the time this is caused by heat buildup between the siding and the wall this heat excapes through the laps and causes stain.
It also helps with wind infiltration through the walls.
Also it is a vapor barrior on boyh sides of the board.
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.
Like bob said it helps with sound insulation.
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.
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.
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.
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.
It also serves as an air barrier.
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.
I have not seen any studies that show how well tape adheres to foam over the long haul.
This creates a horizontal seam every 4 feet.
The products are easy to handle score cut and install and no special tools are needed.
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.
When every penny counts you can rely on the performance of our most economical fanfold siding underlayment.
Generally referred to as rigid foam insulation this type of foam insulation is also called foam board foam plastic insulated.
