Alchemy-Spetec Blog

Steve Taylor

Recent Posts

Case Study – Stabilizing Student Housing

Posted by Steve Taylor on Nov 22, 2022 10:00:00 AM

Banner - Stabilizing Student Housing

Body - Stabilizing Student HousingRecently Atlanta-based contractor Sitemix was called in for a highly urgent remedial project at a nearby university apartment building. A plumbing break quickly evolved into a bigger issue than just fixing some pipes. The breach resulted in large voids under the foundation slab that compromised the integrity of the entire structure. Sitemix answered the call and was immediately up to the challenge. 

Powerful Polymer

Alchemy-Spetec’s AP Lift 430 was chosen for the job due to its high density, high expansion rate, high yield, and cure strength. This two-component, high-strength, high-density, hydro-insensitive structural polyurethane foam is ideal for void fill and structural stabilization and void fill in situations like the one described above. AP Lift 430 weighs 2.75 – 3.25 pounds per cubic foot.

AP Lift 430 Data

Painless Procedure

The structural polymer was injected through the slab to fill the voids and compact any compromised soil.

Rapid Result

The project was completed in a half day while most of the occupants were in class. The GC was ecstatic to have this emergency resolved quickly and painlessly.

Want more information on geotech products?

Download the Info-Packed Geotech Product Catalog!

Topics: All Posts, Stabilize Soil, Fill Voids

Why Your Garage Floor Slab is Settling

Posted by Steve Taylor on Aug 11, 2022 10:49:00 AM

Banner - Why Your Garage Floor Slab is Settling

Body - Why Your Garage Floor Slab is SettlingSettling Garage Floor Slab – Causes

As with most slab settling issues, voids and poor soil compaction are at the root of the problem. This is certainly the case with sunken garage slabs. They are typically constructed by backfilling the area after the foundation is poured (or blocked) and pouring the concrete on top. Achieving proper and adequate compaction is often difficult and just not achieved in many cases. This, combined with time and freeze/thaw cycles creates voids under the garage slab. Concrete itself is heavy and can settle, but when we park vehicles on top of a garage slab that has voids under it? It is obviously a recipe for disaster!

Settling Garage Floor Slab – Solution

Alchemy-Spetec can refer you to a contractor for a thorough site evaluation. A qualified contractor takes the time to properly inspect the issue, which generally entails probing the slab to determine if there is indeed a void and/or unstable soil (and to what extent). Gathering this type of information is key to designing a proper repair plan and calculating the amount of polyurethane lifting material needed.

Depending on the conditions found during site evaluation, there are a couple of different techniques the contactor may use (and oftentimes both). If the soil under the garage slab is soft and unstable to a certain depth, they may opt for the Deep Lift® method. The expanding structural foam creates a squeeze effect in the loose soil, essentially forming added support footings under the slab. The other injection method, Slab Lifting, entails going through ⅜-inch holes drilled directly through the slab. The same structural foam described above is used. The expanding foam travels the path of least resistance, therefore, filling all void areas as well as compacting any loose soil. Once the soil is compact, the expansion of the foam creates the power to lift the slab. Our high-density polyurethane cures to 90% in fifteen minutes – which translates to the slab being traffic-ready by the time we are packing up our equipment.

Want more info on the Deep Lift® and Slab Lift methods?

Download an Info-Packed Deep Lift Brochure!

Download an Info-Packed Slab Lift Brochure!


Topics: All Posts, Lift Slabs, Deep Lift