---
title: "20 Mil Vapor Barrier for Crawl Space — $287K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/20-mil-vapor-barrier-for-crawl-space"
last_updated: "2026-08-08T08:52:59.022Z"
locale: en
meta:
description: "Niche score 36/100 · $287K/yr market · 45K searches/yr · $307.91 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · $287K/yr market · 45K searches/yr · $307.91 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "20 Mil Vapor Barrier for Crawl Space — $287K/yr Amazon US Niche (2026) - Flapen"
---
# **20 mil vapor barrier for crawl space**
**Skip it**
Prices mostly outside the sweet spot ($13.68–$919.17) — this niche doesn't clear our bar today.
Market size 51Growth 25Conversion 26Competition 45Returns 49Price range 9Avg price 30Brand share 23Review moat 90Quality gap 17
**Review moat**
**Great****204.71**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$287K**
$287K/yr · 45K searches
**Returns**
**Okay****3.1%**
return rate — above 5% kills the launch gate
**Competition**
**Okay****58%**
top-5 click share — leaders hold, buyers still browse
**Avg price**
**Okay****$307.91**
avg listing price — sweet spot $15–$100
**Conversion**
**Okay****2.1%**
search→purchase rate — share of searches ending in a sale
**Growth**
**Okay****+0.3%**
90-day search growth — must beat 0% to launch
**Brand share**
**Bad****91%**
top-5 brand share — brand-locked demand
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Price range**
**Bad****$13.68–$919.17**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, 20 mil vapor barrier for crawl space is a $287K/yr Amazon United States market (45K searches/yr). The top 5 brands hold 91% of demand. Demand peaks in Sep–Oct–Nov. Verdict: Skip it — 36/100.
Data updated Jul 28, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **20 mil vapor barrier for crawl space market data**
- **Units sold / yr**
- **1K–1K**
- avg 0–100/product
- **Revenue / yr**
- **$308K–$385K**
- units × avg price
- **Conversion rate**
- **2.1%**
- **Avg BSR**
- **#480**
- **Page quality**
- **0%**
- **Prime**
- **43%**
- **Sponsored**
- **86%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **205 days**
## **Competition & brand share**
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**10 **▲rising
**Sellers**
**13**
**Top-5 brand share**
**91%**
Top 20: 100%
**Top-5 click share**
**58%**
Top 20: 99%
**Open market**
**6%**
- Crawl Space DIY28% - Farm Plastic Supply23% - PureSpace Armor19% - Crawldryer17% - Adroiteet3% - Generic3% - Open — no brand owns it (4 brands, 6%)
## **Demand & seasonality**
Weekly Amazon search volume, last 88 weeks — +0.3% search growth over the last 90 days.
900700Spike '25Prime Day '25Spike '26Prime Day '26 seasonDecJanFebMarAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Sep, Oct, Nov · busiest ÷ quietest = 1.9×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/20-mil-vapor-barrier-for-crawl-space/trend)
## **Top 20 mil vapor barrier for crawl space search terms**
- **20 mil vapor barrier**18K/yr-10.8%1.3% conv. - **20 mil plastic sheeting**8K/yr+10.8%1.0% conv. - **20 mil vapor barrier for crawl space**6K/yr-18.3%1.6% conv. - **20 mil reinforced crawl space liner**4K/yr+42.1%0.4% conv. - **20 mil crawl space vapor barrier**3K/yr+30.0%1.3% conv. - **crawl space vapor barrier 20 mil**3K/yr+4.7%1.6% conv. - **vapor barrier crawl space 20 mil**2K/yr+71.3%0.4% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/20-mil-vapor-barrier-for-crawl-space/search-terms)
## **Top 20 mil vapor barrier for crawl space products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$14K10%$29K15%$43K20%$57K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)5 products missing review or click data not plotted
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Whitecap - Woven Vapor Barrier - 20 Mil (12 x 100) Thick Plastic sheeting Drop Cloth Moisture Barrier Covering for Crawl Space Encapsulation Life-Time Warranty**Crawl Space DIY**$472.24**4.8★116 rev](https://www.amazon.com/dp/B0BY3JXXZW) [2**Crawl Space Vapor Barrier 20 Mil Vapor Barrier 10x50 White Plastic Sheeting - Thick Plastic Sheeting Heavy Duty Polyethylene Film Drop Cloth Vapor Barrier Covering for Crawl Space Basement**PureSpace Armor**$203.12**4.7★163 rev](https://www.amazon.com/dp/B0F1Y1C3DQ) [3**Farm Plastic Supply - Crawl Space Vapor Barrier - 20 mil - Thick Plastic Sheeting Drop Cloth Moisture Barrier for Crawl Space Encapsulation Heavy Duty Polyethylene Panda Film (6 x 100)**Farm Plastic Supply**$296.61**0.0★0 rev](https://www.amazon.com/dp/B0G2MZ4BZC) [4**Crawl Space Vapor Barrier - 20 Mil Vapor Barriers - (10 x 50) - Tear Resistant Heavy Duty Vapor Barrier Drop Cloth Moisture Barrier Thick Plastic Sheeting Covering for Crawlspace Encapsulation**Crawldryer**$204.25**4.6★390 rev](https://www.amazon.com/dp/B0DSHR2CHT) [5**Crawl Space Vapor Barrier - 20 Mil Vapor Barriers - (10 x 100) - Tear Resistant Heavy Duty Vapor Barrier Drop Cloth Moisture Barrier Thick Plastic Sheeting Covering for Crawlspace Encapsulation**Crawldryer**$405.86**4.6★390 rev](https://www.amazon.com/dp/B0DSHR2CHV)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Whitecap Crawl Space Encapsulation Kit 20 Mil Woven Vapor Barrier 12x100 Covers 1 200 Sq. Ft. Includes 2 Seam Tape Rolls Butyl Tape & 100 Fasteners Heavy Duty Crawl Space Vapor Barrier**Crawl Space DIY**$578.75**0 rev3mo ago](https://www.amazon.com/dp/B0GYPX534B) [**Whitecap Crawl Space Vapor Barrier Encapsulation Kit 12 & 20 Mil Woven Barrier for 2 000 Sq. Ft. Vapor Barrier Tape Sealant Butyl Tape & Installation Fasteners Included**Crawl Space DIY**$919.17**0 rev6mo ago](https://www.amazon.com/dp/B0GK2W67Z6) [**The Liner Guys 20 Mil Crawl Space Vapor Barrier 12 ft x 100 ft Heavy Duty Reinforced Woven Plastic Sheeting for Crawl Space Encapsulation Moisture & Radon Barrier**The Liner Guys**$443.31**2 rev8mo ago](https://www.amazon.com/dp/B0G3YTV85L) [**Farm Plastic Supply - Crawl Space Vapor Barrier - 20 mil - Thick Plastic Sheeting Drop Cloth Moisture Barrier for Crawl Space Encapsulation Heavy Duty Polyethylene Panda Film (6 x 100)**Farm Plastic Supply**$296.61**0 rev8mo ago](https://www.amazon.com/dp/B0G2MZ4BZC) [**Crawl Space Vapor Barrier - 15 Mil Vapor Barrier - (12 x 100) Tear Resistant Heavy Duty Vapor Barrier Plastic Drop Cloth Moisture Barrier Plastic Sheeting Covering for Crawlspace Encapsulation**VAPLINX**$304.56**78 rev1y ago](https://www.amazon.com/dp/B0DSKXJ3ZF)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Whitecap Crawl Space Encapsulation Kit 20 Mil Woven Vapor Barrier 12x100 Covers 1 200 Sq. Ft. Includes 2 Seam Tape Rolls Butyl Tape & 100 Fasteners Heavy Duty Crawl Space Vapor Barrier**Crawl Space DIY**$578.75**0.0★**▲ 281%**](https://www.amazon.com/dp/B0GYPX534B) [**Adroiteet 7 x 10 FT Pond Liner 20 Mil HDPE Pond Liners for Outdoor Ponds**Adroiteet**$22.16**4.3★**▲ 273%**](https://www.amazon.com/dp/B0BVB9KJQF) [**Whitecap Crawl Space Vapor Barrier Encapsulation Kit 12 & 20 Mil Woven Barrier for 2 000 Sq. Ft. Vapor Barrier Tape Sealant Butyl Tape & Installation Fasteners Included**Crawl Space DIY**$919.17**0.0★**▲ 136%**](https://www.amazon.com/dp/B0GK2W67Z6) [**Farm Plastic Supply - 20 Mil Concrete Vapor Barrier - Thick Plastic Sheet for Floor Underlayment Radon Gas Barrier EVOH Plastic Sheeting Crawl Space Vapor Barrier Gas Barrier (12 x 10)**Farm Plastic Supply**$149.08**0.0★**▲ 122%**](https://www.amazon.com/dp/B0F7SC1GJ1) [**The Liner Guys 20 Mil Crawl Space Vapor Barrier 12 ft x 100 ft Heavy Duty Reinforced Woven Plastic Sheeting for Crawl Space Encapsulation Moisture & Radon Barrier**The Liner Guys**$443.31**5.0★**▲ 113%**](https://www.amazon.com/dp/B0G3YTV85L)
**~~View all trending →~~**
## **What buyers say about 20 mil vapor barrier for crawl space**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**25%
*“Excellent product”*
**Thickness**14%
*“Nice and thick”*
**Durability**13%
*“durable”*
**Weight Heavy**13%
*“This product is SUPER heavy duty”*
**Value For Money**8%
*“It is worth the money”*
**Advertised Vs Actual Product**6%
*“All worked as shown”*
**Ease Of Use**4%
*“stuff cuts easy”*
**Design-Overall**3%
*“Great project”*
**Strength**2%
*“This product is SUPER heavy duty”*
**Plant Growth**2%
*“I'm hoping this will keep grass from growing in the rocks”*
### **What buyers complain about **
**Quality-Overall**14%
*“Garbage — do not buy”*
**Leak-Proof**14%
*“mine leaked immediately as we were filling the pond”*
**Weight Heavy**14%
*“it's heavy and not easy to manage you need at least 2 to 4 guys to help with this”*
**Thickness**12%
*“Very thick”*
**Measurement/Reading Accuracy**7%
*“Inaccurate sizing”*
**Color**7%
*“product did not work for original location as i thought i ordered a clear product not white”*
**Advertised Vs Actual Product**7%
*“Product was not the same dimensions advertised”*
### **Top return reasons **
**Size-Overall**36%
**Thin**17%
**Material Quality**15%
**Thickness**6%
**Value For Money**5%
**Advertised Vs Actual Product**4%
**Flexibility**2%
**Quality-Overall**2%
**Weight Heavy**2%
**Functionality-Overall**2%
## **Common questions**
- **Is 20 mil vapor barrier for crawl space profitable to sell on Amazon United States?**
- The niche generates $287K/yr across 21 tracked products. 3 of 4 products launched in the last 360 days are still selling. 90-day search growth is +0.3%. Flapen's verdict: Skip it (36/100).
- **How competitive is the 20 mil vapor barrier for crawl space niche?**
- 10 brands and 13 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 91% of demand.
- **What do buyers complain about in 20 mil vapor barrier for crawl space?**
- Top complaints mined from reviews: Quality-Overall, Leak-Proof, Weight Heavy. The return rate is 3.1%.
- **When does demand for 20 mil vapor barrier for crawl space peak?**
- Demand peaks in Sep–Oct–Nov; the busiest month runs 1.9× the quietest.
- **What does it cost to enter the 20 mil vapor barrier for crawl space niche?**
- Listings span $13.68–$919.17; the average listing price is $307.91 (sweet spot $15–$100). The average incumbent carries 205 reviews — the moat a new listing must climb.
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