under deck waterproofing system
Worth a lookShows a thin review moat (176 avg reviews), but a small market ($24K/yr) keeps it on the watch list.
Review moat
Great175.84avg incumbent reviews — the moat a new listing must climb
Avg price
Great$56.60avg listing price — sweet spot $15–$100
Returns
Great1.7%return rate — above 5% kills the launch gate
Growth
Good+57.5%90-day search growth — must beat 0% to launch
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Competition
Okay57%top-5 click share — leaders hold, buyers still browse
Brand share
Okay79%top-5 brand share — brands hold most of the demand
Conversion
Okay3.3%search→purchase rate — share of searches ending in a sale
Price range
Okay$11.12–$241.49cheapest to priciest tracked listing — scored on the share inside $15–$100
Market size
Bad$24K$24K/yr · 13K searches
According to Flapen's Amazon United States niche tracking, under deck waterproofing system is a $24K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 79% of demand. Demand peaks in Apr–May–Aug–Sep. Verdict: Worth a look — 54/100.
Data updated Jul 26, 2026 · scored weekly · How we score niches
under deck waterproofing system market data
- Units sold / yr
- 2K–2K
- avg 0–100/product
- Revenue / yr
- $85K–$113K
- units × avg price
- Conversion rate
- 3.3%
- Avg BSR
- #774
- Page quality
- 0%
- Prime
- 47%
- Sponsored
- 89%
- Out of stock
- 2.0%
- Avg brand age
- 49 months
- Avg seller age
- 185 days
Competition & brand share
The top 5 products take 57% of clicks — established leaders, but buyers still shop beyond them.Brands
11 rising
Sellers
17
Top-5 brand share
79%
Top 20: 100%
Top-5 click share
57%
Top 20: 100%
Open market
16%
- Trex RainEscape36%
- TREX23%
- Fewlby9%
- RainEscape6%
- Pangda5%
- YOOZENA5%
- Open — no brand owns it (5 brands, 16%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +57.5% search growth over the last 90 days.Peak months: Apr, May, Aug, Sep · busiest ÷ quietest = 4.1×
Top under deck waterproofing system 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 19 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Trex RainEscape Deck Black Drainage Trough for Underdeck Ceilings - 16
Trex RainEscape$44.254.6★41 rev
TREX RainEscape Black Deck Drainage System Trough for Underdeck Ceiling - 12
TREX$32.534.9★12 rev
RainEscape Deck Drainage System Downspout - Black
Trex RainEscape$43.304.5★55 rev
Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size
Fewlby$25.554.5★1,294 rev
Trex RainEscape Butyl Waterproof Tape Roll 4 in. x 50 ft.
TREX$60.744.7★101 rev
Newest
by launch date
1PCS 50FT Black Waterproofing Membrane Black for Under Deck Drainage System HDPE Deck Membrane Use for 16 Joist Spacing DE03
EMAYUU$63.995 rev
Pangda 8 Rolls Under Deck Drainage System Bulk HDPE 16 ft Black
Pangda$138.026 rev
Muzata 1PCS 50FT Black Under Deck Drainage System Trough HDPE Waterproofing Membrane Fit for 16 Joist Spacing M081
Muzata$66.7443 rev
Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size
Fewlby$25.341,294 rev
Pushglossy 52.49 ft x 16.14 Inches Black Under Deck Drainage System Trough HDPE Waterproofing Membrane 0.03 Thick Rain Drainage System for Under Deck Ceiling Fit Joist Spacing Under 16 Inches
Pushglossy$44.2115 rev
Trending
90-day click momentumPangda 8 Rolls Under Deck Drainage System Bulk HDPE 16 ft Black
Pangda$138.025.0★
Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size
Fewlby$25.554.5★
Kids Toddler Rain Suit for boys girls One Piece Hoodie Zipper Waterproof Rain Jacket 2-5 years M Size
Fewlby$23.414.3★
Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size
Fewlby$25.344.5★
Pushglossy 52.49 ft x 16.14 Inches Black Under Deck Drainage System Trough HDPE Waterproofing Membrane 0.03 Thick Rain Drainage System for Under Deck Ceiling Fit Joist Spacing Under 16 Inches
Pushglossy$44.213.8★
What buyers say about under deck waterproofing system
What buyers praise and complain about, mined from review topics.What buyers love
“Good product”
“overall seems to work as expected”
“keeps him dry”
“Easy to use with great stick”
“Adorable print, keeps him dry, adjustable waist, nice material, love that it has its own little bag for traveling”
“Installed as expected”
“are easy to cut”
What buyers complain about
“Expensive”
“A little brittle”
Top return reasons
Common questions
- Is under deck waterproofing system profitable to sell on Amazon United States?
- The niche generates $24K/yr across 19 tracked products. 1 of 1 products launched in the last 360 days are still selling. 90-day search growth is +57.5%. Flapen's verdict: Worth a look (54/100).
- How competitive is the under deck waterproofing system niche?
- 11 brands and 17 sellers compete. The top 5 products take 57% of clicks and top 5 brands hold 79% of demand.
- What do buyers complain about in under deck waterproofing system?
- Top complaints mined from reviews: Value For Money, Strength. The return rate is 1.7%.
- When does demand for under deck waterproofing system peak?
- Demand peaks in Apr–May–Aug–Sep; the busiest month runs 4.1× the quietest.
- What does it cost to enter the under deck waterproofing system niche?
- Listings span $11.12–$241.49; the average listing price is $56.60 (sweet spot $15–$100). The average incumbent carries 176 reviews — the moat a new listing must climb.