Across the roof surface
The main application is mineral boards above the waterproofing directly beneath the PV installation. Supports, joints and load distribution are planned across the area.
VlamShield WEER · Weather-resistant mineral board above waterproofing beneath PV
The mineral board.
Directly beneath your PV.
WEER places a weather-resistant, glass-fibre-reinforced mineral board on the roof surface beneath the PV installation. It sits above the water-carrying waterproofing: on PVC-P, granule-surfaced bitumen, PIB or TPO/FPO, directly on the membrane with project-specific wind restraint. The membrane is retained and continues to provide waterproofing.
01 · Function
Function and installed position
On an existing PV roof, the area beneath the membrane is often accessible only with substantial work. WEER works above that level: a cement-bound mineral board is added to the roof surface beneath and between the modules. This enables a mineral protective layer to be planned while the existing roof waterproofing retains its function.
Material durability, load distribution and detailing are considered together. For PVC-P, granule-surfaced bitumen, PIB and TPO/FPO, the specific board is coordinated with the actual membrane. Water must be able to drain beneath the layer; wind restraint is designed for the building.
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 beneath PV
A mineral layer sits where a fire between modules and roof can expose the surface. Its thickness, joints and the assembly beneath it determine the technical assessment.
Weather and moisture
The exterior board is selected for rain, moisture cycling and frost. What counts is the documentation for the specific version and a construction that drains water.
PV supports and maintenance
Supports, contact areas and foot traffic create point loads. Board edges, membrane and insulation are considered as one continuous load path.
02 · Material
Material build-up
WEER by VlamShield is a 15 mm cement-bonded, glass-fibre-reinforced lightweight concrete board. The uncoated board is non-combustible (A1), water-resistant and suitable for weather-exposed outdoor applications. The product data sheet sets out the values and testing scope.
- Cement-bound mineral matrix with glass-fibre reinforcement
- Documented exterior application as a selection criterion
- Material class and performance scope established from the actual documents
- Thickness and surface mass matched to roof loading and the protection task
03 · Installation
Installation on the roof
- 01
Identify the membrane
Record PVC-P, granule-surfaced bitumen, PIB or TPO/FPO with the precise product designation and condition. Document seams, low spots and repairs.
- 02
Coordinate contact and loading
Lay the boards directly on the waterproofing. Assess flatness, supports and load distribution together.
- 03
Plan the board area
Define the area beneath PV, perimeter zones and maintenance routes on the plan. Include joints, cutting and accessible connections in the installation drawing.
- 04
Provide wind restraint
Design fixing or ballast for the building and roof zone. Include additional loads in the structural assessment and keep the waterproofing fully functional.
- 05
Check drainage
Keep outlets, emergency overflows and inspection points clear. Water on the existing membrane must be able to drain freely.
Joints, outlets and upstands
At edges and upstands
WEER can additionally be used in exposed edge and connection details. Vertical fixing and drainage require their own design.
At outlets and penetrations
Cutting and connections preserve drainage and maintenance access. The board is an additional layer; the membrane remains water-carrying.
04 · Data
Technical data
Product data and position
WEER · 15 mm · Water-resistant. Technical values apply to the uncoated board.
| WEER position | Above waterproofing beneath PV; also at edge details |
|---|---|
| Membranes considered | PVC-P, granule-surfaced bitumen, PIB, TPO/FPO |
| Material | Cement-bound, glass-fibre-reinforced mineral board |
| Reaction to fire | A1 under EN 13501-1 |
| Outdoor use | Water-resistant; suitable for weather-exposed outdoor applications |
| Mass per area at 15 mm | Approx. 12 kg/m² at 7% moisture content |
| Contact and fixing | Directly on the waterproofing; fixing designed for the project |
05 · Selection
When yes, when no
Suitable
- Mineral protective layer above retained roof waterproofing beneath PV
- PVC-P, granule-surfaced bitumen, PIB and TPO/FPO with coordinated contact
- Projects with suitable spare structural capacity and wind restraint
- Exposed edge, upstand and connection details
Not suitable
- As a replacement for the water-carrying membrane
- Above damaged waterproofing without prior repairs
- Without a loading and wind-restraint concept
- With blocked outlets or inaccessible maintenance points
06 · Questions
Questions from practice
Is WEER only intended for roof edges?
No. The main focus is the roof surface above the waterproofing directly beneath the PV installation. Edges, upstands and penetrations are additional applications.
Which roof membranes are considered for WEER?
PVC-P, granule-surfaced bitumen, PIB and TPO/FPO. The boards are laid directly on the waterproofing.
Is the existing waterproofing retained?
Yes, that is a key aim of this layer position. A suitable condition is required. The membrane remains water-carrying; drainage, seams and connections are included in the design.
How much weight should I allow for?
The 15 mm board weighs approximately 12 kg/m² at 7% moisture content. The standard 2,600 × 1,250 mm board weighs about 39 kg by calculation. Allow for moisture, tolerances and ballast in the roof design.
How is the surface restrained against wind?
Roof height, location, edge and corner zones and the specific construction determine the design. Fixing, ballast and waterproofing details are specified together.
Project enquiry for VlamShield WEER
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, product designation and condition of roof waterproofing
- Roof area, building height, location and drainage
- PV plan showing supports, ballast and maintenance routes
- Spare structural capacity and proposed board layout
- Protection requirement and installation programme
