Like bob said it helps with sound insulation.
Fanfold insulation under vinyl siding.
Generally referred to as rigid foam insulation this type of foam insulation is.
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.
It also helps with wind infiltration through the walls.
Vinyl siding is lightweight easy to cut and easy to install which makes it the natural choice for contractors.
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.
If you have ever seen vinyl siding and the laps looked dirty all the time this is caused.
It also helps to level the walls so you get a better smoother siding job.
Foil faced foam board insulation is a great idea but is not a good choice for hot climates or cold climates as an exterior insulation product.
We will start with hot climates.
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.
Easy to handle cut and install.
When every penny counts you can rely on the performance of our most economical fanfold siding underlayment.
I have not seen any studies that show how well tape adheres to foam over the long haul.
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.
Owens corning foamular fanfold insulation sheathing is suitable to use on wood steel framing or concrete walls.
Hot climates already have a lot of heat and vinyl siding tends to expand and contract with temperature changes up to 1 if the siding is made of recycled vinyl material.
It also serves as an air barrier.
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.
Owens corning foamular 1 4 in.
R 1 fanfold rigid foam board insulation sheathing 21um the home depot.
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.
This creates a horizontal seam every 4 feet.
