Stormwater Retained
67%
Per rainfall event
We Turn Your
Roof Into Infrastructure
Stormwater management · Energy savings · Extended membrane life
Turnkey installation carrying our own structural engineer — from assessment to first bloom.
Watch the Roof
Build Itself
Hover each phase to reveal material specs, timeline, and a photo from that stage.
Structural Assessment
Load capacity before layer one
Our licensed structural engineer reviews existing roof drawings and performs a live load calculation. We determine if the deck can carry 15–25 psf (extensive) or up to 150 psf (intensive).
Membrane & Root Barrier
The seal that lasts 50 years
We install or verify a TPO/EPDM waterproofing membrane rated for root resistance. A copper-impregnated root barrier is added above any existing membrane not rated FLL root-resistant.
Drainage Layer
Move water, hold what plants need
A high-void HDPE drainage mat (8mm–40mm) sits above the membrane. It channels excess rainfall to roof drains while retaining up to 1.5L/m² in reservoir cups for plant use during dry spells.
Engineered Substrate
Not soil — a precision growing medium
Our substrate blend is 80% expanded shale/slate, 20% organic compost. It delivers 4–6″ depth for extensive systems at only 10 lbs/sq ft dry, optimized for sedum root depth and pH 7.0–8.0.
Planting & Establishment
12–14 sedum varieties, pre-grown
Pre-grown sedum mats are rolled out and tamped into substrate. Our curated mix of 12–14 varieties ensures year-round color, 100% coverage within 90 days, and survival through zone 4–9 winters.
Maintenance Plan
Two visits a year keeps it performing
Annual contract includes spring fertilization, weed suppression, drain inspection, and an end-of-season cutback. We provide a digital dashboard showing stormwater retention performance monthly.
Annual Cost Per
Square Foot
When you amortize capital cost over membrane lifespan and factor in stormwater fee credits, energy savings, and deferred replacement, green roofs cost 52% less annually than conventional systems.
$5.23
NY State tax credit/sq ft
6 pts
LEED Sustainable Sites
Traditional Bit. Felt
Replacement every 15 yrs
TPO Membrane
Replacement every 20 yrs
Green Roof System
Membrane lasts 40–50 yrs
60%+ stormwater runoff reduction per storm event
Municipalities credit green roof area against stormwater retention fees — average savings $0.30–$0.80/sq ft/yr.
Up to 6.7% reduction in energy bills
Substrate insulation reduces peak cooling load and allows downsizing of HVAC systems on new builds.
2.4M
Sq Ft Installed
340+
Commercial Roofs
67%
Stormwater Retained
23yr
Avg Membrane Life Added
From the People Above It
Scroll to read more ›
"Sedum carried the structural PE, coordinated with our roofing contractor, and delivered a certified LEED documentation package. One call to one company — that's rare."
Marcus Webb
VP Facilities, Halsted Commercial REIT
Chicago, IL — 48,000 sq ft install
"The stormwater retention dashboard is what sold our city council. We pull monthly data showing exactly how much runoff we diverted. That's the proof we needed for the next budget cycle."
Priya Nair
Director of Public Works, City of Evanston
Evanston, IL — Municipal campus, 3 buildings
"We spec Sedum as the preferred installer on our LEED-targeted projects. Their assembly detail is clean, their PE stamps are current, and they've never missed a punch list."
Daniel Kowalski
Principal, Kowalski + Frame Architecture
Milwaukee, WI — 12 projects completed
"From the moment they submitted their structural assessment to the day we passed final inspection, every deadline was hit. The sedum established in 60 days — ahead of their own 90-day warranty."
Tamara Osei
Asset Manager, Lakeshore Property Group
Detroit, MI — 22,000 sq ft retrofit
Price My
Roof
Three inputs. Instant ballpark. No email required until you want a detailed PDF scope with material specs and a site visit schedule.
Industry range: $22–$40/sq ft installed, depending on roof type, access complexity, and membrane condition. Average project: $18K–$120K.