---
title: "Under Deck Waterproofing System — $24K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/under-deck-waterproofing-system"
last_updated: "2026-08-08T15:48:57.091Z"
locale: en
meta:
description: "Niche score 54/100 · $24K/yr market · 13K searches/yr · $56.60 avg price. A small market ($24K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 54/100 · $24K/yr market · 13K searches/yr · $56.60 avg price. A small market ($24K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Under Deck Waterproofing System — $24K/yr Amazon US Niche (2026) - Flapen"
---
# **under deck waterproofing system**
**Worth a look**
Shows a thin review moat (176 avg reviews), but a small market ($24K/yr) keeps it on the watch list.
Market size 6Growth 73Conversion 41Competition 47Returns 80Price range 37Avg price 91Brand share 44Review moat 91Quality gap 73
**Review moat**
**Great****175.84**
avg incumbent reviews — the moat a new listing must climb
**Avg price**
**Great****$56.60**
avg listing price — sweet spot $15–$100
**Returns**
**Great****1.7%**
return rate — above 5% kills the launch gate
**Growth**
**Good****+57.5%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Good****4.3★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****57%**
top-5 click share — leaders hold, buyers still browse
**Brand share**
**Okay****79%**
top-5 brand share — brands hold most of the demand
**Conversion**
**Okay****3.3%**
search→purchase rate — share of searches ending in a sale
**Price range**
**Okay****$11.12–$241.49**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Bad****$24K**
$24K/yr · 13K searches
**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, 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 ~~](https://flapen.com/research/methodology)
## **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.
2K2KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Aug, Sep · busiest ÷ quietest = 4.1×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/under-deck-waterproofing-system/trend)
## **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.
0%10%$2K20%$5K30%$7K40%$9K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 19 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Trex RainEscape Deck Black Drainage Trough for Underdeck Ceilings - 16**Trex RainEscape**$44.25**4.6★41 rev](https://www.amazon.com/dp/B07GNTNM55) [2**TREX RainEscape Black Deck Drainage System Trough for Underdeck Ceiling - 12**TREX**$32.53**4.9★12 rev](https://www.amazon.com/dp/B099SX63ZN) [3**RainEscape Deck Drainage System Downspout - Black**Trex RainEscape**$43.30**4.5★55 rev](https://www.amazon.com/dp/B07GNPZBYJ) [4**Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size**Fewlby**$25.55**4.5★1,294 rev](https://www.amazon.com/dp/B0BZYWS1MW) [5**Trex RainEscape Butyl Waterproof Tape Roll 4 in. x 50 ft.**TREX**$60.74**4.7★101 rev](https://www.amazon.com/dp/B00NI4YIFS)
**~~View all top sellers →~~**
### **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**$63.99**5 rev12mo ago](https://www.amazon.com/dp/B0FKD81KGV) [**Pangda 8 Rolls Under Deck Drainage System Bulk HDPE 16 ft Black**Pangda**$138.02**6 rev1y ago](https://www.amazon.com/dp/B0FGY5DD7T) [**Muzata 1PCS 50FT Black Under Deck Drainage System Trough HDPE Waterproofing Membrane Fit for 16 Joist Spacing M081**Muzata**$66.74**43 rev1y ago](https://www.amazon.com/dp/B0DP6NSM5B) [**Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size**Fewlby**$25.34**1,294 rev2y ago](https://www.amazon.com/dp/B0CXT1N7R1) [**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**$44.21**15 rev2y ago](https://www.amazon.com/dp/B0CP3YQYX9)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Pangda 8 Rolls Under Deck Drainage System Bulk HDPE 16 ft Black**Pangda**$138.02**5.0★**▲ 180%**](https://www.amazon.com/dp/B0FGY5DD7T) [**Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size**Fewlby**$25.55**4.5★**▲ 179%**](https://www.amazon.com/dp/B0BZYWS1MW) [**Kids Toddler Rain Suit for boys girls One Piece Hoodie Zipper Waterproof Rain Jacket 2-5 years M Size**Fewlby**$23.41**4.3★**▲ 179%**](https://www.amazon.com/dp/B09XMKG6YX) [**Fewlby Kids Toddler Rain Suit for Boys Girls One Piece Hoodie Zipper Cartoon Waterproof Coverall Rain Jacket 2-5 Years M Size**Fewlby**$25.34**4.5★**▲ 178%**](https://www.amazon.com/dp/B0CXT1N7R1) [**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**$44.21**3.8★**▲ 69%**](https://www.amazon.com/dp/B0CP3YQYX9)
**~~View all trending →~~**
## **What buyers say about under deck waterproofing system**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**20%
*“Good product”*
**Advertised Vs Actual Product**13%
*“overall seems to work as expected”*
**Quick Drying**10%
*“keeps him dry”*
**Adhesion/Stickiness**10%
*“Easy to use with great stick”*
**Print Quality**10%
*“Adorable print, keeps him dry, adjustable waist, nice material, love that it has its own little bag for traveling”*
**Assembly/Installation**7%
*“Installed as expected”*
**Ease Of Use**7%
*“are easy to cut”*
### **What buyers complain about **
**Value For Money**28%
*“Expensive”*
**Strength**11%
*“A little brittle”*
### **Top return reasons **
**Size-Overall**29%
**Compatibility-Overall**14%
**Material Quality**9%
**Advertised Vs Actual Product**7%
**Quality-Overall**6%
**Functionality-Overall**6%
**Length**4%
**Value For Money**3%
**Flexibility**3%
**Smell**3%
## **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.
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