Nudura Peel & Stick

Damp Proofing of Nudura ICF

We recommend the use of Nudura "Peel and Stick" damp proof membrane to protect the ICF from ground moisture. This membrane is a self-adhesive waterproofing composed of a SBS modified bitumen and a tri-laminated woven polyethylene facer. The underface is covered with a silicone release film. Nudura DP membrane is applied direct to the ICF surface.

The Nudura Peel & Stick is the Soprema Colphene ICF Membrane manufactured under private license to Nudura and printed with the Nudura logo as shown in the photo to the right.

When application temperatures range from -10 to +10 degress C (-13 to 50 degrees F), it is important to use winter grade Peel & Stick so that correct adhesion is obtained. Summer grade is suitable for temperatures from +10 to 50 degrees C (50 to 122 degrees F).

Surface Preparation

Clean dry and even surfaces do not require priming. If special conditions require a primer (such as excessive dust or oxidation of the EPS due to excessive sun), then we recommend the use of a water-based "Elastocol Stick H2O" primer. Solvent based primers cannot be used because they will damage the EPS.

Nudura Membrane Installation

Installation

The Peel and Stick membrane must be adhered to the substrate by peeling off the silicone release film. If needed, apply Elastocol Stick H2O primer at the rate of 0.1 to 0.3 L/m2. Allow drying completely before application of the membrane. Membrane must be applied the same day as the application of primer.

Side lap joints must be a minimum of 75 mm (3 in) and end lap joints must be a minimum of 150 mm (6 in). The top edge of the membrane and where the membrane meets with the concrete footing, it must be sealed with a mastic/sealant such as Sopraseal LM 200 T which is compatible with polystyrene. Apply even pressure using a membrane roller over the entire surface of the membrane to ensure good adherence.

Backfilling should be done by a self compacting granular fill. If there is any danger of damage to the membrane by backfilling, installation of a protection board is recommended. We do not recommend the use of a dimple membrane as soil gets into the dimples and settlement over time tends to drag the dimple membrane off the wall.

For the top 12" of the foundation wall, we recommend the installation of 1/4" Hardiboard, ripped to the 12" width and mechanically attached to the ICF webs 16" on centre using stainless or other non-corrosive #8 or #10 x 1-1/2" round headed screws.

Click on image for complete installation guide.

Membrane Properties

The Peel and Stick membrane has been tested for the following properties:

Peel and Stick properties
Code Compliance

Code Compliance

The report by Halsall Engineering (now WSP Group) provides the opinion that the Nudura Dampproofing Membrane meets the intent of the 2006 Ontario Building Code, and by inference meets the intent of the current BC Building Code.

"The Nudura Membrane Product:

  • Is composed of self-adhering polymer modified bitumen that has a history of being compatible with expanded polystyrene based ICFs (provided solvent based primers are not used);
  • Has lower water vapour transmission than other membranes specified in Sub-Section 9.13.2 of the OBC which are less than 1.0 g/m2/day. The water vapour transmission of the damproofing is well under this threshold, at around 0.14 g/m2/day, and therefore will adequately resist below grade water vapour; and
  • The collective layers of the membrane can provide adequate resistance to soil gas, as good or better than the materials already approved the OBC. This is based on the material's low vapour permeability and the inherent air tightness of the assembly."

Click on the image for a PDF of the full report.