You are here:

Architecture/Waterproofing of walls and crawl space


Is waterproofing of the entire block structure prior to the brick installation a code requirement in New Jersey and if yes, what materials should be used?

Is waterproof of the crawl space inside (walls, floor, ceiling) and out a code requirement in New Jersey and if it is, what waterproof materials should be used?

Thanks for your help.

Hi Nur,

Thank you for the question. I am licensed in Washington State only so I won't be able to give you a definitive answer on what is required in New Jersey. There are national codes and then local codes that may be enforced, so speaking to the building department in your jurisdiction would be required to get an accurate answer.

So usually in a brick and block wall there will be foam insulation between the two layers of block. That layer can act as a vapor barrier but generally the block itself is okay to be exposed to a limited amount of water that might get in the wall. At each penetration and at the bottom of the wall there needs to be weep holes and / or flashing to drain the water out of the wall. If you are in an unusually harsh area of weather or high winds you may need to upgrade this. Or if the wall is below grade then water proofing would be necessary.

Regarding the crawl space, generally the exterior walls are waterproofed to keep the crawl space dry. A typical system would include a product like Graywall ( and a dimple drainage mat ( The floor of the crawl space would typically have a 6 MIL min thick vapor barrier. You may pour a 'rat slab' over this, which is just a crude concrete slab to make the area more serviceable. The ceiling would not typically be waterproofed, but it would usually be insulated unless the entire crawl space is insulated and heated (which is sometimes done)

I hope this helps. Check with your local Jurisdiction though.

Nazim Nice
Principal / Architect
Motionspace Architecture + Design Websites: Seattle Architects
Read our Seattle Architecture Blog
Learn more about us: Seattle Architects information
Learn more about our services: Seattle Architecture and Design Services
Levels of services: Seattle Architects Services
Frequently asked architect questions answered by a: Seattle Architect
Contact Motionspace - Seattle Architects
A list of all our completed projects:Seattle Architects Projects

See our completed projects at:  Seattle Architecture Projects
Lake Washington Waterfront House
New American Farmhouse
Green Home Design at Rim Rock Ranch
Green Lake House Remodel
Seattle Condo Remodel
Seattle Craftsman Remodel
Seattle Mid-Century Modern Remodel
Seattle Brick Home Remodel
Mercer Island Remodel
Seattle Capitol Hill Craftsman Remodel
Seattle Basement Remodel
Seattle Bungalow Remodel
Seattle Second Story Addition
Seattle Outdoor Kitchen Design
Seattle Townhouse Design
Seattle Bathroom Remodel
Kirkland Bathroom Remodel
Seattle Porch Design
Seattle New Home Design
Bellevue House Addition
Bellevue Landscape Design
Swimming Pool Design
Seattle Entry Design
Bellevue Daycare Design
Seattle Tenant Improvement Design
Seattle School Design

Looking for an architect? Seattle Architect
Remodeling your bathroom: Seattle Bathroom Remodel
Laundry and mudroom design: Seattle Mudroom and Laundry Room Design
Remodeling your entire house: Seattle Whole House Remodel
Information on Seattle Home additions: Seattle Home Additions
Adding a roof deck: Seattle Roof Deck Design
Choosing exterior colors and materials: Exterior Houe Colors
Read about remodeling your basement: Seattle Basement Remodel
Consider adding a second story addition: Seattle Second Story Addition
Sustainable and green design resources: Seattle Green House Design
Information on garage additions: Seattle Garage Additions
Choosing Kitchen Materials: Seattle Kitchen Design
Kitchen Remodels: Seattle Kitchen Remodel
New House Design: Seattle New House Design

CHECK OUT OUR NEWEST PRODUCT - Custom Engraved switchplates: Switch Labels
See our gallery of products: Custom Engraved Switchplates
Send in your own switchplates: Light Switch Labels
Uses for our Custom Engraved Switchplates  


All Answers

Answers by Expert:

Ask Experts


Nazim Nice


I am a Seattle Architect and can answer architecture and design related questions. Ask me about material suggestions or usage. Ask me about design options - what is good design and what is bad. Ask me about choosing exterior house colors and furniture layout options. Ask me about detailing and assembling houses or components in the home. Ask me about green design or materials. Ask me about choosing an architect, the architectural services, basement remodels, second story additions, and whole house remodels. Ask me about garage design, bathroom remodels, laundry and mudroom design, family room additions, and roof deck additions.


Over 12 years of practice in the Architectural field including three years of internship plus 5 years of school. I have taught at the Knowlton School of Architecture at the Ohio State University and lectured at Carnegie Mellon University. I currently own and run the Seattle Architecture Firm, Motionspace Architecture + Design PLLC.

National Council of Architectural Registration Boards (NCARB, Seattle Architects | Motionspace Architecture + Design. More information at our blog the (un)common house. Lumen ID Custom Engraved Switch Plates with Labels.

BArch from Carnegie Mellon University & Andrew Carnegie Scholar

©2017 All rights reserved.

[an error occurred while processing this directive]