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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 15 reviews
Excel Pressure Washing
Excel Pressure Washing
April 7, 2022.
Deco Products makes the best decorative sealers on the market! We use there products daily to enhance and restore our customers paver and hardscape projects. Deco you guys are awesome!
October 11, 2021.
Richard Paul
Richard Paul
September 26, 2021.
5 star products and company
Clint Reynolds
Clint Reynolds
September 14, 2021.
Love the sealers! I have used their Paver, Travertine, and concrete Sealers for past 6 years. Great results. I get rave reviews from our clients as a professional contractor. Customer support is a pleasure. Great team. The owner is dedicated to Education/training. All about building relationships.
John Chatham
John Chatham
September 13, 2021.
Awesome company to work with. Fast shipping and reliable. Amazing sealers
Missy Ordiway
Missy Ordiway
September 13, 2021.
We used Deco 20 Clear on my concrete patio about 4 years ago because I was having run off from my gutters which was causing mold and this product was phenomenal, you could see the water bead right off afterwards and I never had mold there again. I ended up selling that house and painted the same patio for curb appeal and it covered so nicely without using a primer because of the Deco 20. The customer service and integrity from this company and all its representatives is phenomenal, they walked me through it all happily step by step. Thanks Team Deco!
Casey Tuliano
Casey Tuliano
September 12, 2021.
I love deco products. Worked with this product many times. Every customer was very satisfied with the outcome. Highly recommend this product to everyone I come a crossed. Customer service is even better.
John Forrester
John Forrester
December 8, 2017.
I used the paver sealer product on my driveway and it is a beautiful result. I had extra product left over and gave it to a friend. He said there were tire marks on his drive and I emailed Deco for help. In less than 1 hour a representative called and told us how to fix the problem. My friend just hadn't let the product dry enough. All was easily resolved. You just can't get service like that anymore.