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Insulation Building Products

Drainage Board
Insulation

The Science behind Insulation
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DuraDrain - Insulation Drainage Board
Moisture Management
Dura-Drain is a Expanded Polystyrene (EPS) rigid insulation board that is designed to assist water drainage away from the exterior foundation walls. This drainage board has built-in vertical channels and shiplap edges along the long side to help provide long-term protection.

As an option, filtration or landscape fabric can be field installed to offer an added layer of flow protection.

Controlling moisture is one of the most important factor in design and construction of a structure. Exposure to long-term moisture can damage the structural integrity of a building. Uncontrolled moisture can also create a unhealthy living environment due to the promotion of mold. Building Science has defined a drainage planes as “a path of water flow over the building envelope.” DuraDrain can help provide a drainage plane.
What Makes DuraDrain Superior
  • 2 Sides of Drainage ChannelsDrainage on both sides of the insulation panels offers the advantage of more water flow opportunity.
  • More Water Flow ChannelsCompared with other brands, Plymouth Foam’s DuraDrain has 20% - 50% more channels for water flow.
  • Shiplap EdgesShiplap offers a better flow pattern as a connection over T & G type joints.
  • Stable Consistant R-ValueUnlike XPS and Polyiso, DuraDrain is manufactured using EPS which holds its r-value which results in better value. Learn More
  • High Density FoamDuraDrain offers high density EPS foam that has compressive resistance at 10% of 15 psi or 25 psi.
  • Water ResilientEPS has proven to be moisture resilient and can has been shown to have the ability to expel moisture Learn More
  • Will Not Contaminate SoilDuraDrain is made from an inert EPS foam insulation that when installed properly, will not breakdown, rot or leach off gases into the surrounding soil.
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DuraDrain drainage board for perimeter or  foundation i
Moisture can impact insulation when used below grade. EPS has been shown through studies to be very resilient to moisture in foundation insulation. While initially taking on slightly more moisture than Extruded Polystyrene (XPS), EPS has the ability to discard it. Conversely, XPS takes on slightly less moisture but moisture tends to get trapped in the XPS tends to trap into the cell structure.
DuraDrain Options
DuraDrain offers many options that provide and even better product and value.
  • Density Strengths15 PSI
    25 PSI
    50 PSI *
  • Lengths8’
    9’
    10’
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  • Ship Lap2 Sides
    4 Sides *
  • Thickness1.5”
    2.0”
    2.5”
    3.0”
    4.0”
    Other Thickness Available*
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Insulation Options for thickness and sizes
* Custom Order
EPS Has The Advantages
EPS Holds Its R-Value
Expanded Polystyrene (EPS) is manufactured in a way where 98% of the product is enclosed in small chamber filled up with regular air. Other types of insulations use diffusive gasses to help increase their R-values. These gasses tend to escape out eventually lower their R-Value. In EPS air can be replaced with air and it has no effect on the R-Value. That is whys in numerous lab experiments and studies, EPS R-Value tends to remain constant. Learn More

The
Long-Term Thermal Resistance (LTTR) method of measuring insulation R-value uses a 15 year weighted average, however most buildings have a lifespan of 100 years.
EPS Moisture Resilient
Moisture can impact insulation when used below grade. EPS has been shown through studies to be very resilient to moisture in foundation insulation. While initially taking on slightly more moisture than Extruded Polystyrene (XPS), EPS has the ability to discard it. Conversely, XPS takes on slightly less moisture but moisture tends to get trapped in the XPS tends to trap into the cell structure.
XPS vs EPS Water Absoprtion
EPS is Very Cost Effective
Compared to the other ridged insulation, EPS is by far the best value.
  • Lower Purchase PriceEPS $15.36 2” x 4’ x 8’ Board
    XPS $26.98 2” x 4’ x 8’ Board
    43% Less for EPS
  • Lower Cost/Published R-Value InchEPS $1.84/R-Value Inch
    XPS $2.70/R-Value Inch
    32% Less for EPS
  • Lower Cost/Field Study R-Value InchEPS $1.96/R-Value Inch
    XPS $5.19/R-Value Inch
    62% Less for EPS
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Which Insulation is your best value
Retail Prices Arrived at by Home Depot and Gulf Eagle Supply 7/15/15
Published R-Value
EPS 4.17/inch
XPS 5.0/Inch
Fiield Study R-Value
EPS 3.92/inch
XPS 2.60/Inch
Plymouth Foam manufactures a variety of weather resistant barriers and drainage plane products. Expanded Polystyrene and Graphite Polystyrene (Neopor) have been found to be a great barrier or rain screen in many applications. Water management and moisture control is extremely important in the construction and building industry and EPS/GPS has proven to be very effective.


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Quote Call
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Product Downloads

Other Downloads

PF Spec Sheet
(R-Values and PSI)

XPS VS EPS
(15 year study)

Why EPS is Better
(Recent Research)

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