DRYLOK Versus SANI-TRED Comparison


DRYLOK® is similar to latex paint but more viscous and gritty. DRYLOK® recommends applying two coats at 75-100 square feet per gal (13-21 mils total thickness in two coats). DRYLOK® recommends applying their product only when air and surface temperatures are 50°F (10°C), or higher.

DRYLOK® basement waterproofing recommends patching any joints, cracks, holes, and wall/floor junction with either their cementitious patch product or a fast-setting hydraulic cement. Joints and cracks can move due to settling, natural earth movement, among many other causes. Cementitious materials have zero elongation/flexibility, therefore, cannot tolerate any movement. Cementitious patch materials crack and can leak when any movement occurs.

The only basement waterproofing performance data and physical properties found in their Tech Data Sheet resistance up to 10 psi of water pressure and “reduces radon gas penetration by reducing vapor transfer.” There are no claims of testing radon reduction at all, only a presumption that it does so by lessening the amount of vapor it allows to pass through.

There are no claims for elongation or any flexibility. DRYLOK® is not intended to be applied to floors or surfaces subjected to any foot traffic. Their clear sealers specify not for use on any masonry surface subjected to hydrostatic pressure. Their latex floor paint Tech Data Sheet makes no claims to withstand moisture vapor drive or hydrostatic pressure and doesn’t reference basement floors.


Sani-Tred® products are a type of polyurethane, and they cure within substrates to become as tough as a tire. The first coat penetrates into the concrete (block, brick, stone, or mortar) to permanently adhere, remains permanently flexible, waterproof, and seals out over 99% of radon.

The Sani-Tred basement waterproofing application process is shown step by step on this page. The PermaFlex Tech Data Sheet is available here. One prime coat of PermaFlex (240 square feet per gallon) is applied first in order to absorb/penetrate (only block needs two prime coats of PermaFlex).

Any joints, cracks, holes, rough areas, and wall/floor junctions are sealed with LRB/TAV mixture. Two parts LRB (Liquid Rubber Base) can be mixed with one part TAV (Thickening Activator), which creates a mixture similar to silicone caulk. LRB/TAV mixture will molecularly weld to the underlying PermaFlex.

Lastly, topcoat with one coat of PermaFlex (240 square feet per gallon) for a third layer of protection from water and Radon.

SANI-TRED waterproofing products have no application temperature limitations. PermaFlex has 590% elongation and has held 30 psi of water pressure at a nuclear facility that used the SANI-TRED® system.

LRB has 600% elongation, unlike any cementitious patching mixture, which ensures no cracking when movement occurs. Sani-Tred® products have been tested in the laboratory and in the field to seal out over 99% of radon. Sani-Tred® was used on a basement that had a radon reading of 155.3 pCi/L before application which was reduced to 0.2 pCi/L after applying.

Sani-Tred® products are not only durable enough for foot traffic; but also durable enough for vehicle traffic.

Sani-Tred® also has two more decorative systems that can be applied that use Color Flakes and another that uses Quartz Granules. Both come in different colors and color blends. Color Flakes also come in different sizes. Don’t hesitate to call or email if you have any questions, would like to discuss the nature of your application, or would like to discuss your application in more detail.

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