Crawl Space Vent Insulation Blocks by Vanity Vents

$14.97 /pair

853 in stock

$21.40 less 30% $14.97 (per vent – 2 inserts included)

Color: Classy Charcoal Black

Luxury, Exterior, Air-tight, 99.9% Waterproof, Washable, Military Grade, 10-50 year life, Installs in 3 Seconds, No tools required! No more Styrofoam inserts!

  • CNC Custom Cut with high quality precision to create a perfect fit, air-tight seal. Simply push the expandable material into your vent openings to create a water-tight seal to keep the weather and critters out of your crawl space!

  • Our Insulation Blocks won’t mold, rot or mildew. Made from proven tough, lightweight, resilient, highly resistant to moisture because it has impermeable thick cellular walls. Used in the marine industry – military grade strength and durability!

  • About 70% of the air you breath in your home comes from your crawlspace. Our products are Safe – CFC Free, Ozone Friendly and 100% Recyclable – the Styrofoam you are using now is not recyclable! We are 100% Designed and Manufactured in the USA!

  • Available in 2-inch thickness (1 and ½ inch custom inserts available if needed (call for information) – Save on utility bills in both Winter and Summer. In the Summer when it is 90 degrees outside, then it’s 90 degrees in your crawl space… Close up your vents in Summer too!

  • Use our Insulation Blocks with our Vanity Vent “vent covers” to DOUBLE your layers of insulation. The combined R Value is comparable to that recommended for exterior wall home construction. Reduce your furnace and air conditioner energy bills!

  • When you add “1” purchase to your cart you will actually receive 2 Insulation Blocks!

100% Money Back Guarantee for 60 days – No Questions Asked Guarantee

The “Combo Pack”

(Luxury Long-Term Solution)

853 in stock

No Thanks!No Thanks!
SKU: 15001 Categories: ,

Vanity Vents

Luxury Insulation Blocks

No More Styrofoam Inserts

Vanity Vents - Save your energy bills upto 15%

Custom Orders

We’d love to hear about your Vents!

Call 503.548.7444 or email

Imperfect Vanity Vents

Same Benefits but a Lower Price (limited availability)

Pricing Info

Vent Covers $21.97

Insulation Blocks $14.97

Combo Pack $31.97

Vanity Vents Vent Covers Installation / User Guide

Vanity Vents Insulation Blocks Installation / User Guide

IMPORTANT - BEFORE YOU PURCHASE: Please measure the inside opening of your crawl space vent (see image with dimensions) to make sure Vanity Vents will work for your home. Your INSIDE vent opening must be no larger than 7 1/4 inches tall by 15 7/8 inches wide AND you must have a vertical center panel in the middle of your crawl space vent for Vanity Vents to work. If your INSIDE vent opening is smaller than the dimensions mentioned AND you do have the vertical center panel then you can easily trim Vanity Vents to fit with a typical home skill saw. Call us first before you cut. If you have a different size vent opening OR you dont have the vertical center panel on your existing vent opening then please contact us for a custom order. 100% Satisfaction Guaranteed. Made in America.

We only ship to 24 States (see below). If you do not live in one of the 24 States then it is our experience that our Vent Covers / Insulation Blocks will not work for your crawl space application. Please contact us if you’d like further information. We ONLY ship to: AL, AR, CA, CO, DC, GA, ID, KY, LA, MD, MO, MS, NC, NJ, NV, OR, SC, TN, TX, UT, VA, WA, WV, WY, MT



Vanity Vents Insulation Blocks are used to winterize and insulate your crawl space. Keep pipes from freezing in the Winter. They install in 3 seconds… no tools required. Save on your heating bills…

And yes, save on your air-conditioning bills too – If it is 90 degrees outside in the Summer then it’s 90 degrees in your crawl space BUT it doesn’t have to be… Close up your vents in the Summer too!

Improve interior home comfort while insulating your crawl space foundation vents.

Improve your curb appeal by not using those unsightly dirty, white, styrofoam vent inserts. Our Insulation Blocks are very stylish and don’t look dirty or crumbly all the time.

And no need to go under your crawl space to install your Insulation Blocks… from outside your home, they simply squeeze into your vent opening and expand to create a very nice tight seal… Seal out that cold and/or hot air!

Keep critters out too!

Service Temperature °F -30 to 180. The special material is characterized by its high compressive and tensile strength, fatigue resistance, and low thermal shrinkage.
Our material is CFC Free, Ozone Friendly and 100% Recyclable. Not classified for hazards to the environment.

100% Designed and Manufactured in America.

And, The Classy Charcoal Black color is very, very attractive!

Custom sizes are available… contact us! or call 503.548.7444


2-inch Insulation Blocks are Fabulous.

The 2-inch Insulation Blocks are the Luxury version designed for your crawl space vents… estimated useful life in the industry is at least 10 years and often much, much longer depending upon the installation environment. The 2-inch version provides a R Value up to R16 when combined with Vanity Vents and it will make a BIG difference to your interior home comfort.

The R-value of our material is approximately R-6.5 to 7 per inch. Contractors often use it to insulate under slabs, ceilings, walls, and roofs. It performs better than other insulation types. Typical recommendations for exterior walls are R-13 to R-23. Vanity Vent Foam Insulation Blocks are 2 inches thick for a R Value of 13-14.

When you cover our Insulation Blocks with our Vanity Vent vent covers you are doubling the layers of insulation and the combined R Value is comparable to that recommended for exterior wall home construction. Reduce your furnace and air conditioner energy bills AND Save our Environment!

Custom thicknesses of ½ inch and 1 inch are available for installations where you just don’t have the room for a 2 inch block. Please contact us at or 503.548.7444 for more information.


“I received a flyer from Vanity Vents and within a few days I contacted them and ordered both the vent covers and the extra strong insulation blocks. They are both very sturdy products.
I needed one vent customized to accommodate my AC power supply line so my handyman expertly removed the exact amount needed in no time. He installed them with ease as I can’t bend down right now due to a knee injury. It took less than an hour. My wood floors are already warmer.
The vent covers look much more acceptable than those white Styrofoam blocks that blow away in the winter winds and are prone to discoloring over time.
PS One neighbor has already acquired some for her house.
Jane C. – Vancouver, WA

DISCLAIMEROur material is cut via CNC to meet the measurements provided in this listing. There is a tolerance in the foam thickness of +- 1/8 of an inch. This is normal for material of the type we use for our Insulation Blocks. If your project requires exact thickness measurements please consider purchasing a small quantity to test for your project requirements.

Buyer assumes all responsibility for loss or damage arising from the handling and use of this product, whether done in accordance with directions or not. Statements concerning the possible use of this product are not intended as recommendation to use this product in the infringement of any patent. All values reported are typical values. We cannot guarantee the applicability or the accuracy of this information or the suitability of the product for any particular purpose. This product is sold without warranty, expressed or implied. (Unless stated otherwise.)


Additional information

Weight 2.2 oz
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