ENGINEERING SPECIFICATION & ASSET VERIFICATION

Technical Scope Verification & Low-Slope Tender Packages.

Providing facility directors, asset managers, and procurement officers with defensible roof condition audits, CAD budgeting estimates, and independent contractor-ready scope packages in Winnipeg & Prairie markets.

Design Standard CSA A123.21 Wind uplift certified

Prairie Climate -40°C to +38°C Thermal cycle vetted

Scope Deliverable Level-3 CAD Tender-ready plans

Launch Scope Workbench View Membrane Matrix

Active Scope Dossier

SAMPLE AUDIT ID: #WPG-2024-88A

VERIFIED CAD

Target Facility: Inkster Industrial Substation

Deck Substrate: 22-Ga Fluted Steel / 2" Polyiso

Core Moisture Test: 14.2% Delta (HVAC Perimeter)

Prescribed Specification: 2-Ply SBS Torch / Polyiso 2-Layer

Prairie R-Value Target: R-35.2 Continuous

SECTION DETAIL D-03: PARAPET FLASHING SCALE: 1:10

Defensible Scope Documented

MODULE 01 • INTERACTIVE TENDER ARCHITECT

Facility Scope Planning Workbench & Brief Generator

Select real-world facility parameters below to configure conditional membrane assemblies, drainage slope adjustments, and defensible budget scopes tailored for Western Canada low-slope assemblies.

Input Parameters REVISION: LIVE-CALC

1. Approximate Roof Area (Sq. Ft.)

2. Existing Substrate / Assembly

3. Rooftop Traffic & Equipment Footprint

4. Immediate Observed Symptom / Priority

Dynamic Scope Specification Output

Engineered 2-Ply SBS Modified Bitumen Assembly

RECOMMENDED: MOD-BIT SBS

Recommended Membrane

2-Ply Torch/Mop SBS Modified Bitumen (250g Base + Granular Cap)

Insulation Specification

Dual-layer Staggered Polyisocyanurate (R-30 Min, LTTR compliant)

Drainage / Slope Engineering

Tapered Polyiso Crickets (1:50 min slope to internal sumps)

Substrate Fastening

Engineered Stress Plates w/ Heavy-Duty Mechanical Fasteners

Procurement Rationale:

For severe freeze-thaw stress and high service technician footfall, multi-layer redundant bitumen with puncture-resistant ceramic granule caps outperforms single-ply membranes against accidental puncture tools, HVAC servicing drops, and ponding silt formation.

Estimated Budget Envelope (Material & Labor):

$16.50 – $21.00 / sq ft CAD

Expected Assembly Lifespan:

25 – 30 Years (with PM Plan)

Need this assembly configured into an enforceable bid specification? Export CAD Tender Package →

MODULE 02 • ENGINEERING COMPARISON

System Decision Criteria Matrix

Defensible low-slope membrane comparisons evaluated across thermal resistance, chemical durability, ponding tolerance, and winter installations under Canadian climatic stressors.

Engineering Parameter	TPO Single-Ply (60-80 mil)	EPDM Rubber (60-90 mil)	2-Ply SBS Modified Bitumen
Ponding Water Tolerance	Moderate Seam stress under standing water; relies exclusively on welded overlap integrity.	High Naturally impervious to standing water; seam adhesives require primer vigilance.	Exceptional Dual fused monolithic layers; self-healing bitumen characteristics resist hydrostatic head.
Mechanical Puncture Resistance	Moderate Single membrane vulnerability to sharp gravel, dropped tools, and heavy boots.	High Elongation Stretches up to 300%; vulnerable to tears from angular mechanical dragging.	Superior (Multi-Ply) Non-woven polyester reinforcing mats absorb direct compression and heavy maintenance paths.
Sub-Zero Thermal Flexibility	Becomes brittle below -25°C unless cold-weather formulated.	Stays pliable down to -45°C. Excellent freeze-shock absorption.	SBS synthetic rubber modification maintains flexibility to -30°C.
Winter Installation Feasibility	Hot-air welding possible down to -10°C; robotic pre-heat tracking mandatory.	Solvent adhesive tack compromised under +4°C; requires specialized winter bonding.	Torch-applied application allows sub-zero installation under strict hot-work safety.
Tender Unit Cost Profile	$$ (Economical CapEx)	$$$ (Balanced OpEx)	$$$$ (Max Durability / Long-cycle)

CSA FORMULA INTEGRITY: Wind Uplift Resistance [P_mod = P_std × C_p] verified per NBC 2020 Part 4 specifications.

Independent Field Audits: Non-Manufacturer Tied

MODULE 03 • FACILITY STEWARDSHIP

Annual Facility Maintenance Calendar & Handover Artefacts

A predictable four-season commercial preventative maintenance framework designed to preserve warranty covenants and defer capital expenditure across Prairie commercial assets.

Q1 / MARCH - MAY SPRING

Thaw & Drainage Verification

Clear drain baskets of winter ice blockage. Conduct flood-clearance tests on internal roof sumps, scuppers, and conductor heads after snowpack liquidation.

✓ Internal drain clearance
✓ Membrane puncture probing

Q2 / JUNE - AUGUST SUMMER

Solar UV & Seam Verification

Inspect thermoplastic weld integrity and bitumen mastic at parapet termination bars under peak thermal solar expansion. Check mechanical HVAC service pathways.

✓ Thermal stress crack audit
✓ Walkway pad realignment

Q3 / SEPT - NOVEMBER AUTUMN

Freeze-Prep & Flashing Cinch

Pre-freeze sealing of all expansion joints, pitch pockets, and perimeter coping metal caps. Ensure secondary overflow scuppers are unobstructed.

✓ Pitch pan mastic top-off
✓ Parapet counter-flashing

Q4 / DEC - FEBRUARY WINTER

Snow Load & Ice-Dam Control

Monitor snow drift accumulation at clerestory step-downs and equipment penthouses. Controlled manual snow evacuation to prevent structural deck overload.

✓ Drift depth profiling
✓ Safe non-blade clearing

Contractor Handover Artefact Dossier

Mandatory engineering records supplied at substantial completion

ISO-9001 Compliant Audit

1. As-Built CAD Drawings Vector DWG & PDF detailing all field-adjusted penetrations, drain basins, and curbs.

2. Infrared Core Scan Baseline non-destructive thermal imagery confirming zero entrapped moisture at closeout.

3. Manufacturer NDL Warranty 20–30 Year No Dollar Limit system warranty certificate signed by factory inspector.

4. Maintenance Logbook Digital schedule with quarterly sign-off templates to maintain manufacturer warranty validity.

PROCUREMENT ASSURANCE

Request an Independent Roof Scope Review.

Eliminate ambiguity prior to tender release. Summit Commercial Roofing provides facility managers with comprehensive roof condition audits, defensible scope packages, and contractor-agnostic CAD files.

Included in Every Procurement Package:

► Core moisture & deck integrity survey

► CAD parapet & cricket slope schematics

► Contractor-ready RFP specification document

► Independent budget line item variance audit

Tender Desk Scope Dispatch

Prairie Region Engineering Dispatch (Winnipeg Hub)