Spex•Crete™ 350 Ultra Lightweight Underlayment

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Weighs approximately 3.0 - 3.5 pounds per square foot at 1"! 

 No special foaming equipment is needed on the job site.  

 There is no need to add sand on the jobsite. Just Add Water, Mix, Pump and Place! 

Manufactured to Exacting Specifications To Give You Consistent Quality Job to Job.

Can be packaged in ~2 cubic foot bags or Super Sacks.

Spex•Crete™ 350 ULU is very easy to pump, place and finish. It can even be sloped!

Spex•Crete™ Delivers Greater Yields Per Truckload (~18,000 sf at 1") - Improving Your Project Profits, Decreasing your Carbon Footprint and Minimizing Shipping Costs Per Square Foot!

Spex•Crete™ can be installed from 1" to 6" and you can still use your traditional equipment and supplies already on the job. There is no need for special mixing equipment, knives, adhesives, etc.

Spex•Crete™ Lightweight Concrete is self flashing. This feature reduces the amount of self leveling underlayment loss that leaks under your foam board and helps save labor. 

Spex•Crete™ 350 Ultra Lightweight Underlayment is perfectly designed for historical renovations, multi-family, mixed use residential/office, mass timber construction and more!

Spex•Crete™ 350 ULU has been formulated as an all in one system. Just add water and mix! You will instantly have a premium lightweight underlayment system. 

Spex•Crete™ 350 ULU is commonly between 50% and 70% lighter than traditional underlayments! These weight savings mean more options for you on the job, like reduced dead load and improved worker safety, and often better profitability, too!