WARM ROOF SYSTEMS

WHAT IS A WARM ROOF?

A Warm Roof combines insulation and waterproofing into one high-performance system. Unlike traditional cold roofs, it keeps the insulation above the substrate, maintaining a consistent internal temperature and preventing condensation.

INSTALLATION PROCESS

Remove existing roof covering (if applicable)
Install vapour barrier and insulation boards
Apply TPO, Torch-On, or liquid membrane as waterproof layer
Detail all penetrations and edges to ensure airtight protection

BENEFITS

Excellent energy efficiency and thermal comfort
Prevents condensation and mould buildup
Long-term waterproof and weatherproof protection
Reduces heating and cooling costs

WHY CANSEAL

We deliver Warm Roof systems suited to Christchurch’s unique climate. Our team uses only certified materials and installation techniques for guaranteed performance.

GET IN TOUCH

Upgrade your property with a modern Warm Roof solution. Contact CanSeal for expert advice and a detailed quote.

Christchurch • Canterbury

TPO Membrane – Install & Repair

UV-stable, heat-welded single-ply roofing systems for flat and low-slope roofs. Clean detailing, durable performance, and easy maintenance — ideal for Canterbury’s climate.

How It Works Get a Quote

How we work

TPO Installation & Repair Process

Inspection & Preparation

Full roof survey — slopes, drains, edges, and substrate condition
Surface cleaning, primer where needed, and substrate repair
Fixing cracks, fasteners, and damaged decking before installation

Installation

Sheets laid with precise overlaps for welding
Hot-air welded seams ensure long-term watertight integrity
Detailed flashings at edges, corners, outlets, and penetrations

Repairs & Upgrades

Clean area, abrade lightly, and apply compatible TPO patch
Re-weld fatigued seams and replace aged detailing
Final inspection, weld test, and photographic record (on request)

Outcome: A watertight, clean-looking roof that performs reliably against UV, rain, and wind — built to last.

System options

TPO System Configurations

Mechanically Fastened: Lightweight, quick, cost-effective for large roofs.
Fully Adhered: Smooth appearance with enhanced wind resistance.
Ballasted (where suitable): Uses gravel or pavers for stability and protection.

Thermal Insulation: PIR or EPS boards installed for improved efficiency.
Colour Options: Bright reflective white or neutral tones.
Accessories: TPO drains, pipe boots, trims, and flashing components.

Why it helps

Benefits of TPO Roofing in Christchurch

UV Resistance: Maintains colour and flexibility under strong sunlight.
Welded Seams: Fewer weak points than glued systems.
Low Maintenance: Simple cleaning and quick inspections.

Modern Appearance: Sleek finish around edges and outlets.
Versatile: Works on new builds, refurbishments, and retrofits.
Lightweight: Ideal for structures with limited load capacity.

Best fit

Is TPO the Right Choice for You?

Flat or low-slope roofs with solid existing substrate
Clients wanting clean detailing and long-term reliability
Projects seeking reduced maintenance and better drainage
Light structures that benefit from a low-weight system

FAQs

TPO Roofing – Common Questions

How long does a TPO roof last?

With proper preparation, installation, and maintenance, TPO systems typically deliver decades of reliable performance in New Zealand conditions.

Can my existing TPO roof be repaired?

In many cases yes — re-welding seams, patching with compatible materials, and updating flashings can restore waterproof integrity without full replacement.

Ready to protect your property?

Book TPO Membrane Installation or Repairs

Schedule an on-site assessment and receive a detailed proposal outlining system options and timelines. Servicing Christchurch and the wider Canterbury region.

Christchurch • Canterbury

Warm Roof Systems

Insulation above the deck to stop condensation and heat loss. A warmer, drier roof build-up for flat and low-slope roofs — ideal for Canterbury’s winter mornings and summer highs.

How It Works Get a Quote

How we work

Warm Roof Installation & Retrofit Process

Survey & Design

Assess existing deck, falls/drainage, parapets and load limits
Confirm insulation type/thickness and vapour control requirements
Plan membrane system (TPO or Torch-On) and edge details

Build-Up Preparation

Clean and prime the deck; address damaged boards or substrate
Install vapour control layer as specified
Set out fixings and thermal breaks to avoid cold spots

Insulation & Membrane

Lay insulation boards (PIR/EPS), mechanically fixed or adhered
Optional tapered insulation to create falls toward outlets
Apply cap membrane (TPO or Torch-On) with neat terminations

Outcome: A warmer, drier interior with reduced condensation risk and a durable, low-maintenance roof surface.

System options

Warm Roof Configurations

New Build Warm Roof: Insulation and vapour control above new ply or concrete deck, with TPO or Torch-On cap membrane.
Retrofit Warm Roof: Convert cold roofs to warm roofs over suitable substrates, reducing internal condensation.
Tapered Scheme: Pre-fall insulation boards to improve drainage without re-pitching the deck.

Membrane Choice: TPO (heat-welded seams) or Torch-On (two-layer bitumen) depending on project requirements.
Edge & Parapet Details: Continuous insulation with tidy flashings and termination bars.
Accessories: Overflow scuppers, outlet upgrades and walkway pads where needed.

Why it helps

Benefits of Warm Roofs in Christchurch

Condensation Control: Keeps the deck warm, reducing interstitial condensation.
Energy Efficiency: Better insulation where it matters — above the structure.
Comfort: More stable indoor temperatures through winter and summer.

Durability: Protects the structure from moisture cycling and heat loss.
Clean Detailing: Works neatly with parapets, outlets and penetrations.
Low Maintenance: Pair with robust membranes for easy upkeep.

Best fit

Is a Warm Roof Right for Your Project?

Flat/low-slope roofs on homes, units or commercial spaces
Renovations where condensation or heat loss has been an issue
Owners seeking better comfort and lower energy use
Designs needing tapered falls without re-framing the deck

FAQs

Warm Roof — Common Questions

What’s the difference between a warm roof and a cold roof?

A warm roof places insulation above the deck with a continuous vapour layer, keeping the deck warm and reducing condensation risk. A cold roof insulates below the deck, which can leave the deck cold and prone to moisture in some conditions.

Can you convert my existing flat roof to a warm roof?

Often yes. After assessing the substrate, we can add vapour control, insulation (including tapered boards), and a new membrane to create a warm roof build-up.

Ready to upgrade?

Book a Warm Roof Assessment

We’ll review your roof, recommend the right warm roof build-up, and outline options, timelines and budgets. Serving Christchurch and the wider Canterbury region.