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What to use for damp-proofing on my ICF foundation

February 25, 2013

Written By: Colin Showalter

A frequently asked question I get is, “what-to use for damp-proofing on my Advantage ICF foundation walls?”

Many types of damp-proofing products are suitable for use with the Advantage ICF system. From traditional spray on ones (water based) to the various types of wraps. We recommend the dimpled type of membranes as they provide damp-proofing, drainage and protection from back-fill. Below I will take you through the pros and cons for the 4 most common types.

Standard Spray On
Mineral colloid emulsifiers can be applied to the exterior face of the Advantage ICF system. Follow manufacturer instructions for application; however, it should be noted that liquid coatings will not bridge gaps between insulation panels, so vertical EPS (expanded polystyrene)  joints that are not butted tightly together must be filled before application. The specific product used must be recommended as compatible for use with EPS insulation.

Note: Do not apply highly solvent extended asphalt emulsions as they are not compatible with EPS insulation.

Roll-on
The Roll-on types of waterproofing are a rubberized liquid coating that is either rolled or sprayed on depending on the manufacturer. It usually comes in a bucket.  The pro to the roll-on membrane is that because it is liquid it easily rolls on and fills any of the gaps.

Note: Some of the roll-on systems cannot be installed in cold weather below a certain temperature. See manufacturer’s specifications to confirm.

Peal and Stick Membrane
These types of membranes are considered waterproofing. Several manufacturers of sheet type peel and stick membranes provide product intended for use with EPS insulation. Follow membrane manufacturers installation requirements, including application of a primer coat where necessary, to ensure best adhesion to the exterior face of the Advantage ICF system. Many contractors use this method in combination with a dimpled membrane to get a superior waterproofing and drainage plane.

Note: Some of the peel and stick systems cannot be installed in cold weather below a certain temperature. See manufacturer’s specifications to confirm.

Dimpled Membrane
Several types of dimpled sheet membranes, such as SUPERSEAL Dimpled Membrane, have been evaluated for use as damp-proofing materials by the Canadian Construction Materials Centre (CCMC).  Membrane manufacturer instructions for installation as a damp proofing membrane must be followed when installing on the Advantage ICF system. The pros to this type of system is that it is a stronger thicker plastic that both protects the EPS foam from back-fill and also creates a permanent drainage plane between the soil and the foundation wall. Regardless of the type of damp-proofing you choose the dimpled membrane offers protection to your choice.

Damp-proofing or waterproofing is required by most building codes. Using one of the above methods of damp proofing should help greatly increase the chances of keeping your basement dry and comfortable for years to come.

Note: Contact an Advantage ICF sales representative for recommendations on specific products available in your area. Find one now: http://www.advantageicf.com/about_advantage/wheretobuyadvantage.html 

Visit http://www.advantageicf.com for further information in damp-proofing and ICFs.

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