20 mil vapor barrier for crawl space
Skip itPrices mostly outside the sweet spot ($13.68–$919.17) — this niche doesn't clear our bar today.
Review moat
Great204.71avg incumbent reviews — the moat a new listing must climb
Market size
Good$287K$287K/yr · 45K searches
Returns
Okay3.1%return rate — above 5% kills the launch gate
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Avg price
Okay$307.91avg listing price — sweet spot $15–$100
Conversion
Okay2.1%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
Bad91%top-5 brand share — brand-locked demand
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Price range
Bad$13.68–$919.17cheapest to priciest tracked listing — scored on the share inside $15–$100
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
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.Peak months: Sep, Oct, Nov · busiest ÷ quietest = 1.9×
Top 20 mil vapor barrier for crawl space search terms
- 20 mil vapor barrier18K/yr
- 20 mil plastic sheeting8K/yr
- 20 mil vapor barrier for crawl space6K/yr
- 20 mil reinforced crawl space liner4K/yr
- 20 mil crawl space vapor barrier3K/yr
- crawl space vapor barrier 20 mil3K/yr
- vapor barrier crawl space 20 mil2K/yr
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.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
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$472.244.8★116 rev
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$203.124.7★163 rev
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$296.610.0★0 rev
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$204.254.6★390 rev
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$405.864.6★390 rev
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$578.750 rev
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$919.170 rev
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$443.312 rev
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$296.610 rev
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$304.5678 rev
Trending
90-day click momentumWhitecap 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$578.750.0★
Adroiteet 7 x 10 FT Pond Liner 20 Mil HDPE Pond Liners for Outdoor Ponds
Adroiteet$22.164.3★
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$919.170.0★
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$149.080.0★
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$443.315.0★
What buyers say about 20 mil vapor barrier for crawl space
What buyers praise and complain about, mined from review topics.What buyers love
“Excellent product”
“Nice and thick”
“durable”
“This product is SUPER heavy duty”
“It is worth the money”
“All worked as shown”
“stuff cuts easy”
“Great project”
“This product is SUPER heavy duty”
“I'm hoping this will keep grass from growing in the rocks”
What buyers complain about
“Garbage — do not buy”
“mine leaked immediately as we were filling the pond”
“it's heavy and not easy to manage you need at least 2 to 4 guys to help with this”
“Very thick”
“Inaccurate sizing”
“product did not work for original location as i thought i ordered a clear product not white”
“Product was not the same dimensions advertised”
Top return reasons
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.