Promotions

UPDATE!

?️ Memorial Day Weekend Sale – 20% Off Sitewide ??

Dates:
Starts: Friday, May 23 at 12:00 AM (Midnight)
Ends: Monday, May 26 at 11:59 PM

Details:
We're honoring Memorial Day with a 20% discount on all products sitewide. Whether you're sealing your crawl space, upgrading your drainage system, or preparing for summer humidity, now is the time to get what you need — at a serious discount.

Use code: HONOR20 at checkout to apply the savings.

✔️ No minimum purchase required
✔️ Applies to everything in your cart
✔️ Valid for online purchases only

Don’t wait — the sale ends Monday at midnight.

May Deals Schedule – DIY & Save

Spring is the perfect time to reclaim your crawl space—and we’re making it easier than ever. Take advantage of these limited-time offers designed to help you dry it out, seal it up, and save big while doing it yourself.

May 14–21: Moisture Control Bundle Event

10% OFF All Dehumidifiers
Get ahead of spring humidity with our top-rated crawl space dehumidifiers—engineered for efficiency, durability, and DIY-friendly installation.

PLUS – Extra 10% OFF Vapor Barrier
When you purchase a dehumidifier, you'll unlock an additional 10% off any vapor barrier.
Seal the ground. Dry the air. Defend your home from mold, rot, and costly repairs.

10% off is seen once item is added to your cart

May 24–26: Memorial Day Weekend Sale

15% OFF Sitewide – No Code Needed
From drainage systems to encapsulation supplies, everything is on sale. Whether you're starting your first project or gearing up for a full overhaul, now's the time to stock up.

Discount at Checkout

Why Shop With Crawl Space Ninja DIY?

Pro-grade materials, trusted by contractors
Step-by-step guidance for confident installation
Fast shipping, expert support, and unbeatable value

Don't miss out—these deals won't be back anytime soon.
Shop smart, DIY strong.