DropSide™ Insulation is manufactured from high performance Expanded Polstyrene (EPS) Foam, custom produced to fit all profiles of vinyl siding. Using the latest in computer design technology and state of the art machinery, ABT Foam, LLC can produce contoured EPS insulation to match any vinyl siding brand and their profiles.

Adding a layer of DropSide™ contoured high performance insulation to the back of vinyle siding adds and extra layer of protection from hot and cold. DropSide™ is ideal for new construction & retrofit, and is excellent for residential and commercial buildings.

The combination of DropSide™ insulation and durable vinyl siding adds beauty, strength, protection and additional energy efficiency to any home or building. When you want the look and feel of hardboard siding, don’t settle for high maintenance products like paintable sidings. Choose a rigid, low maintenance product that remains beautiful and offers cost savings year after year.

DropSide™ Performance Insulation Offers

  • Excellent rigidity which insures the siding will install straight and snug while helping to cover many wall impefections.
  • Can increase impact resistance to vinyl siding up to 300%, adding more dent resistance.
  • DropSide™ insulation is not attached to the vinyl siding allowing for independent expansion and contractions between the siding and insulation.
  • No adhesives or fasteners to restrict the natural and independent movement of siding and insulation which can cause buckling of vinyl siding

DropSide™ Benefits to The Home Owner

  • Additional insulation
  • May receive tax credit
  • Greater comfort in summer and winter
  • Contoured insulation adds to the rigidity of standard
    vinyl siding
  • Adds to the straightness of the wall
  • Increases impact resistance
  • Tight siding laps
  • Reduces sound transmission

DropSide™Benefits to The Installer

  • Custom produced to fit each brand and profile of vinyl siding
  • Installs fast and easy
  • Lightweight
  • No special tools required
  • No need for saw cutting
  • No airborne dust from sawing causing health risk to workers
  • No specialized crew members cutting panels
  • No adhesives to remove from the back surface of siding
  Expanded Polystyrene Insulation
Expanded Polystyrene (EPS) is a rigid closed cell, lightweight, resilient, foamed plastic insulation. EPS is manufactured from resin that includes a flame retardant. However, it should be considered flammable and should not be exposed to any source of combustion. EPS is manufactured to meet or exceed the requirements of ASTM C578 and major building codes.

Environmental Impact
EPS insulation is an inert, organic material produced from petroleum and natural gas byproducts. EPS insulation does not contain CFCs or HCFCs. It is manufactured with hydrocarbon blowing agents. It provides no nutritive values to plants, animals, or micoorganisms. It will not rot, and is highly resistant to mildew.

Typical Physical Properties of EPS
ASTM C578 Type XI Min.

  • Density Minimum: 0.70 (pcf)
  • Density Range: 0.70 – 0.75 (pcf) min.
  • Compressive Strength: 5.0 (psi) min.


  • K-factor: @ 75 Deg. F., 0.31
  • R-value: @75 Deg. F., 3.22-3.85(per inch)

Moisture Resistance

  • WVT (perm. In,): 5.0
  • Absorption (vol.)%: Less than 4.0

Maximum Service Temperature

  • Long-term Exposure: 167 Deg. F.
  • Intermittent Exposure: 180 Deg. F.


  • Flame Spread: Less Than 25
  • Smoke Developed: Less Than 450