Accommodate movement
Membrane, substrate and mineral layer respond differently to temperature and loading. Seam and transition details accommodate those movements.
VlamShield VLOEI · Cement-bound protective layer for existing PV roofs
Mineral roof coating.
Applied by squeegee.
VLOEI is a fibre-reinforced, cement-bound roof coating that adds a mineral protective layer above existing waterproofing. It is spread over a prepared substrate with a squeegee or trowel, with mineral-surfaced bitumen as the main substrate focus. Compared with boards, individual cut-outs are avoided, while adhesion testing, mixing and curing become part of installation.
01 · Function
Function and installed position
An existing roof membrane moves with temperature changes and loads. For an additional mineral layer, adhesion, shrinkage and fibre reinforcement therefore matter as much as behaviour under fire exposure. VLOEI focuses on this combination rather than on achieving the highest possible concrete compressive strength.
VLOEI and SHEET belong to the same cement-bound material family. VLOEI addresses the site-applied compound; SHEET addresses the factory-cured fibre composite beneath new waterproofing. Layer position and installation sequence determine which option makes sense for a project.
Schematic positions, not an installation drawing. WEER and VLOEI show alternative material routes above the membrane; SHEET sits below it. The illustrated layers are not automatically combined.
What loads act here?
Fire exposure
VLOEI is classified as a non-combustible material in class A1. This classification describes the reaction to fire of the material.
Temperature and water
Adhesion, moisture cycling and substrate movement need to work together. Material selection and connection details are therefore coordinated with the roof.
Maintenance and added load
Thickness and mass affect the additional roof load. Local loads at PV support feet and maintenance routes are considered separately.
02 · Material
Material build-up
The material is based on fine cement-bound mortar with mineral aggregates and alkali-resistant glass fibres. Hydraulic hardening and fibre reinforcement form the basis of the material family.
- Cement binder with graded fine mineral constituents
- Alkali-resistant short glass fibres to support cohesion
- Consistency, adhesion and shrinkage coordinated with the substrate
- Dry material and a defined water addition
03 · Installation
Installation on the roof
- 01
Survey the substrate
Document the type, age, moisture and condition of the membrane. Granule-surfaced bitumen is the focus of substrate selection; loose surfacing and existing damage are assessed separately.
- 02
Agree a trial area
Cleaning, any bonding treatment and interaction with the membrane are assessed on the actual surface.
- 03
Mix and spread
The application concept combines controlled water addition with spreading by squeegee or trowel. Application rate and consistency are assigned to the selected version.
- 04
Plan curing
The weather window, protection against rain and rapid drying, and release for subsequent work belong in the programme.
- 05
Check connections
Movement joints, penetrations and outlets are treated as individual details. The existing waterproofing retains its own function.
Joints, outlets and upstands
Preserve drainage
Falls, outlets and emergency drainage remain functional and accessible. An additional material layer does not replace repairs to defective roof waterproofing.
Assess membranes individually
Granule-surfaced bitumen, PVC-P, PIB and TPO/FPO present different adhesion and movement challenges. The material combination is assessed for the actual substrate.
04 · Data
Technical data
Material and application
The product line profile. The specific version is coordinated with the substrate and project requirements.
| Material principle | Cement-bound mineral roof coating |
|---|---|
| Reaction to fire | A1 – non-combustible |
| Reinforcement | Alkali-resistant glass fibres |
| Application | Squeegee or trowel |
| Substrate selection | Focus on granule-surfaced bitumen |
| Key criteria | Adhesion, shrinkage, joints and curing conditions |
| Project information | Membrane, area, falls, PV layout and programme |
| Layer thickness | 3 mm |
| Packaging | 25 kg bag |
| Minimum order quantity | 40 bags (1,000 kg) |
05 · Selection
When yes, when no
Suitable
- Existing roofs with suitable waterproofing worth retaining
- Projects with a mineral surface layer
- Projects with coordinated substrate preparation and work sequence
Not suitable
- As a repair for a saturated roof assembly
- As a replacement for existing roof waterproofing
- Across movement joints without a separate connection detail
- On any substrate without assessing adhesion
06 · Questions
Questions from practice
Is VLOEI roof waterproofing?
VLOEI addresses an additional mineral layer. The water-carrying roof membrane and its connections retain a separate function in the assembly.
Is the compound only sprayed?
VLOEI focuses on application by squeegee or trowel. Tool, consistency and thickness control are considered as one application process.
What role do glass fibres play?
Alkali-resistant fibres support the cohesion of the cement-bound matrix. Substrate, geometry and movement also matter for the specific version.
Is high concrete strength automatically better?
For a thin roof layer, adhesion, shrinkage and movement accommodation are as relevant as strength. The appropriate combination is selected for the task on the roof.
How is VLOEI supplied?
VLOEI is supplied in 25 kg bags. The minimum order quantity is 40 bags, totalling 1,000 kg. At a layer thickness of 3 mm, one bag covers approximately 4.6 m² by calculation.
Project enquiry for VlamShield VLOEI
What we need for a quotation
With this information we prepare a concrete proposal: configuration, quantity, documentation and programme. If something is missing, we ask.
Project enquiry- Type, age and condition of the existing membrane
- Roof area, falls and drainage
- PV layout, maintenance routes and spare structural capacity
- Required protection function and designer or insurer specification
- Programme and scope for trial areas
