Flat roof systems · Kaunas, Lithuania
A roof is a system.
Flat roof structures, waterproofing, thermal insulation, installation and maintenance.
Projects
Completed work
Industrial, commercial and residential roofs and terraces — with their real build-ups, materials and locations.
AdministrativeAdministrative building roof with PVC membrane
Kaunas, Lithuania · 2015 · EPS + akmens vata · Fatrafol 810/V 1,5 mm
IndustrialIndustrial building roof with PVC membrane
Kaunas, Lithuania · 2015 · EPS + akmens vata · Fatrafol 810/V 1,5 mm
CommercialRetail building roof refurbishment with PVC membrane
Kaunas, Lithuania · 2015 · Akmens vata · Fatrafol 810/V 1,2 mm
Private houseHouse roof with PVC membrane on OSB
- Location
- Šiauliai, Lithuania
- Year
- 2015
- System
- OSB · Fatrafol 810/V 1,5 mm
Private houseHouse roof with PVC membrane on concrete
- Location
- Kaunas, Lithuania
- Year
- 2015
- System
- Betonas · Fatrafol 810/V 1,5 mm
TerraceResidential terrace in Tauragė
- Location
- Tauragė, Lithuania
- Year
- 2015
- System
- Betonas · Fatrafol 810/V 1,5 mm
What we do
Services
One contractor for the whole roof: from deck to waterproofing and maintenance.
Flat roof installation
A flat roof only performs as a system: structural deck, vapour control, insulation, membrane, fixing and drain…Read more02Profiled steel deck installation
The deck is the foundation of a flat roof. Its deflection and fixing decide whether the insulation and membran…Read more03PVC roofing membrane
A single-ply PVC membrane is hot-air welded, so the roof is sealed without open flame. Watertightness depends…Read more04PIR roof insulation
PIR boards reach the required thermal resistance with a thinner layer than traditional insulation — less load,…Read more
05Sandwich panel installation
Roof, wall, partition and ceiling sandwich panels with flashings and trims. Panel weathertightness depends on…Read more06Flat roof drainage
A flat roof is never truly flat. Falls lead water to outlets, and an emergency overflow protects the structure…Read more
07Flat roof maintenance
A flat roof lasts only if its condition is checked regularly. Defects in the membrane must be put right withou…Read more08Flat roof repair
If a roof leaks, the first job is to find where water actually gets in — the stain inside is rarely directly b…Read moreWhy Stogrenta
Flat roofs — one specialisation, the full cycle
We work with contractors, designers and building owners: from deck to waterproofing and maintenance, with clear technical documentation.
One point of responsibility
Deck, vapour control, insulation, membrane and details — one team, no split responsibility between subcontractors.
Systems, not separate materials
PVC membranes, PIR insulation and fixings are selected as one system for the building, loads and fire requirements.
The details where roofs usually leak
Parapets, outlets, penetrations and junctions follow manufacturer details instead of on-site improvisation.
Documents up front
Datasheets, certificates and DWG/PDF details in one place — for designers and procurement.
How we work
From documents to a handed-over roof
- 01Enquiry and documentsDrawings, quantities or photos by e-mail or via the form.
- 02Assessment and estimateWe assess the solution, quantities and schedule individually.
- 03InstallationWork to the manufacturer system and details, with quality control.
- 04Handover and careWe hand over the documentation and offer regular inspections.
Roof anatomy
Roof anatomy
Every layer has a job. Pull the section apart and see what happens under the membrane.
Drag to rotate · scroll to zoomOne finger to rotate, two to zoom
Schematic, not a construction drawingSystems and materials
Materials and systems
Every material answers four questions: where it goes in the roof, why it is used, what it is compatible with, and which project used it.
Protan PVC roofing membranes
PVC membranes by the Norwegian manufacturer Protan for flat and pitched roofs: mechanically fastened (SE, SE-L, EX, T) and ballasted (G, G-FR, GG). Da…
Read more GOR-STAL (termPIR®)
termPIR AL — foil-faced PIR insulation boards
Rigid polyisocyanurate (PIR) insulation boards faced on both sides with multilayer aluminium foil. λD 0.022 W/(m·K), 20–250 mm, FIT, LAP and TAG edges…
Read more to be confirmed by Stogrenta
Roof outlets, vents and cable entries
Membrane systems are supplied with accessories for details: roof outlets, ventilation vents and cable entries. Models are selected to suit the membran…
Read moreStogrenta Tech
For architects and engineers
Details, technical approvals, specification text and project references in one place. Documents download without registration.
Detail explorer
Detail explorer
Parapet, outlet, expansion joint, rooflight, wall abutment, pipe and cable penetration. Most leaks start here.
Detail 01
Parapet
Membrane upstand and linear perimeter fixing at the parapet — where wind suction and mechanical loads are highest.
Detail 02
Roof outlet
Water collection point with a membrane connection. Placed at the low point with a sump around it.
Detail 03
Pipe penetration
Round penetrations (vents, flues, stacks) are sealed with preformed PVC pipe collars.
Detail 04
Cable penetration
Cables (solar PV, lighting, lightning protection) pass through cable entries, not through the membrane.
Detail 05
Expansion joint
At a structural movement joint the roof must accommodate movement without stressing the membrane.
Detail 06
Rooflight upstand
Membrane upstand to a rooflight or smoke vent kerb — like a parapet, on all four sides.
Detail 07
Wall abutment
Roof-to-wall junction: membrane upstand, linear fixing and protection against water running behind the membrane.
Flat roof repair
Roof leaking?
Photograph the roof and the damage with your phone — a specialist reviews it and calls back. No technical knowledge needed.
Flat roof build-up explained
A warm flat roof has six parts: the structural deck, a vapour control layer, thermal insulation, a separation layer where needed, the waterproofing membrane wit…
Mechanically fastened PVC roofing: how it works
In a mechanically fastened PVC roof the membrane is fixed through the insulation into the deck along the overlaps, and the next sheet is hot-air welded over the…
Engineering experience
Have a project?
Upload drawings, state the area, system and deadline. You get a reference number immediately.
PDF · DWG · DXF · IFC · XLSX · JPG
“Years of experience as a structural designer and in selling and installing roof membranes let us assess a roof’s technical condition quickly and choose the right way to renew it.”
Mantas Pevcevičius, Managing Director, UAB Stogrenta
- Address
- Savanorių pr. 219, LT-50182 Kaunas
- info@stogrenta.lt