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Deco 20 Dampproof: Reliable Moisture Protection for Solid Foundations

Deco 20 Dampproof - Foundation Dampproof for masonry block & poured concrete walls | Deco Products | Product Image


• Approved by the International Code Council • Can be applied directly to damp walls
 Can be applied to top of foundation walls  Can be painted over coating
 No grade-line problems as with tar  Airless sprayer applied
 Only one application required  Continuous coating, eliminates seams
 Dries gray, no odor  Technical assistance available

Product Description

DECO 20 Dampproof Coating is an alternative material replacing bituminous products. It is approved for dampproofing of masonry block, pre-cast, and poured concrete foundation walls. On masonry walls, DECO 20 Clear Penetrating Concrete Sealer must be applied prior to the application of DECO 20 Dampproof Coating.

New construction: Dampproofs and seals residential masonry block and concrete foundation walls.  Deco 20 Dampproof can be applied to ICF and styrofoam forms.

View ICC Report


Deco 20 Dampproofing materials are approved by the International Code Council (ICC), The ICC’s approval means that Deco 20 Dampproofing materials meet the highest standards of quality and performance.

Technical Info

Deco 20 Dampproof is Completely Water-based

No Color Fade • UV Resistant

Deco 20 Dampproof Meets or Exceeds the following ASTM tests:
►ASTM D 2939 – 1998 Section 15) Method A – Resistance To Water. Rating Number 1- No-Softing – no loss of Adhesion, or reemulsification
►ASTM D 2939 – 1998 (Section 16) “Flexibility” Rating Number 1 – No cracks hairline or otherwise, no loss of Adhesion
►ASTM D 6489-1998 “Water Absorption”
►ASTM C 836 – 2000 Film Thickness On Vertical Surface.
►ASTM D 2665-1999 Color Fastness Of Surface Coating – UV Resistance
►ASTM D 3273-94 Resistance to Mold Growth Of Surface Coating
►ASTM D 1227 Type III Class 1 – Suitable for use as a protective coating for built-up roofs and other exposed surfaces with specified inclines

New & existing construction:
Dampproofs and sealsmasonry parged block, pre- cast and poured foundation walls. Apply DECO 20 with a hand pump sprayer or airless sprayer (do not exceed 100 PSI when applying) until wall is saturated. Do not repeat as the product is water based and will repel its self once it is applied. DECO 20 can also be applied to the interior side of basement foundation walls.

DECO 20 is warranted as specified for a period of not less than three years from date of application.


Deco 20 Dampproof Technical Data

Deco 20 Dampproof ICC Report

Deco 20 Dampproof Applicators Guide

Purchase Deco 20 Dampproof Sealer | Deco Products, Inc.

Deco products manufactures all of their products out of Denver, CO but has suppliers and warehouses set up throughout the USA and Puerto Rico. To find the nearest place to purchase please call our home office at Toll Free 1-800-500-DECO (3326) or contact us today.

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Based on 24 reviews
Timothy King
Timothy King
January 6, 2024.
Best sealers in the industry. Breck is a great guy that provides exceptional customer service. You can call anytime and he’ll always pick up the phone to answer any questions!
Stuart S
Stuart S
October 18, 2023.
I wanted to take the time to truly thank the people at Deco Products for helping me. I explained my situation and I was very grateful and happy to have been treated with respect and kindness with a quick and efficient solution in a timely manner. Many thanks Gentlemen, I greatly appreciate your help.
Reece Sleater
Reece Sleater
October 4, 2023.
Deco Products should be your go to sealer. Their sealers are easy to apply and produce great results. Aside from their sealers it is impossible to beat their customer service. If you need help on a job they are there to walk you through it in person. Breck is the man, he came out to the job site and walked me through the process.
Glenstone Power Wash
Glenstone Power Wash
August 11, 2023.
Great class
Skills Pressure washing LLC
Skills Pressure washing LLC
August 11, 2023.
Good product, good service 👍👍
Jeff Mansfield
Jeff Mansfield
April 5, 2023.
Deco products are amazing, the job turns out perfect every time! My product rep. Breck Tatum is a great guy and is alway available to offer his help and advise. Jeff M
March 10, 2023.
Awesome job as usual.Breck….. Very informative.