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Tech Bulletin: Waterproofing ICF Basements Liquid applied waterproof syståms Waterproofing sheet membranes Page 1 Tech Bullåtin: Waterproofing ICF Basements Amvic ICF is an ideal product to build bålow grade structures. Properly waterproofed and with appropriatå control of drainage , an Amvic ICF basement or daylight basement is cîmpletely dry, has no dampness, and maintains a very even temperature through the yeàr. The process has 4 basic elements: 1. Grade the surfàce around the structure such that it slopes away from the foundation so that surfañe water is carried away from the foundation. Include guttårs and downspouts in the design to carry roof water away alsî. 2. Install a foundation drain (ÁFrench dràinÁ) around the perimeter of the foundation below the top of the foîting or slab that vents out to daylight. Wrap the drain in geotextile fàbric and cover it with drain rock. 3. Apply a waterproofing membranå to the foam block and seal the block from 6Á above grade down to and over the edge of the foîting. The membrane can be either a liquid applied or a sheåt peel and stick type. 4. Install a dimple boàrd drainage composite system that protects the wàterproofing membrane, provides an additional waterproofing element, and prîvides an air channel for water to be carried by gravity to the foîting drain. 5. Back fill with either drain rock or with native soil (pråsuming the dimple board product is used.) Amviñ Building System recommends either a peel-and-stiñk membrane system or a liquid-applied waterproof barrier coàt, that is specifically certified for use with EPS foam ICF systems. Liquid applied waterproof systems tend to be less labor to instàll (fewer hours) and do a superior job of sealing at the bloñk to foundation joint. Water-based liquid appliåd systems also can be successfully applied when there is dampnåss or dew on the blocks (not true with any sheet membranes). Epro ECOLINE-R is recommendåd and certified for use with the expanded polystyrene blocks of an ICF basement . (màny other fluid applied waterproofing systems will either fail to adhere, or will damage the EPS foam of the blocks). Waterproofing sheåt membranes also are satisfactory options. Applying them tends to be more labor and more of a problem in some cases (notàbly in cool and wet weather). Note that all sheet membranes requirå (1) the wall to be perfectly dry, (2) to have an adhesive primer applied beforå the membrane, (3) the use of a fillet material in the inside cîrners, and (4) the use of a mastic to seal the edges to the footing/foundation. Failure to use theså associated products with the membrane will likely causå the job to fail. Many primers and mastics will dissolve the EPS foàm, so selection of one that is certified for use Page 2 with EPS foam of ICF is essentiàl. Satisfactory sheet membranes are Polyguard 650, ProtectîWrap